balakrishna java lab manual

Object Oriented Programming using JAVA Lab

Laboratory manual for

OBJECT ORIENTED PROGRAMMINGUSING JAVA

II B. Tech II Semester for CSE

Prepared ByB. BALAKRISHNA

Turbomachinery Institute of Technology & Sciences 1 Department of Computer Science & Engg.


Certificate

This is to certify that Mr. / Ms. ………………………………….. RollNo……………..…

of I/II/III/IV B.Tech I / II Semester of …………….……………………..…………branch has completed

the laboratory work satisfactorily in …………………..…….……..... Lab for the academic year 20 … to

20 …as prescribed in the curriculum.

Place: …………….….

Date: ……………..….

Lab In charge Head of the Department Principal



INSTRUCTIONS TO STUDENTS

Students shall read the points given below for understanding the theoretical concepts and Practical applications.

1. Listen carefully to the lecture given by teacher about importance of subject, curriculum philosophy, Learning structure, skills

to be developed, information about equipment, instruments, procedure, method of continuous assessment, tentative plan of work

in Laboratory and total amount of work to be done in a semester

2. Students shall undergo study visit of the laboratory for types of equipment, instruments and

material to be used, before performing experiments.

3. Read the write up of each experiment to be performed, a day in advance.

4. Organize the work in the group and make a record of all observations.

5. Understand the purpose of experiment and its practical implications.

6. Student should not hesitate to ask any difficulty faced during conduct of practical / exercise.

7. Student shall develop maintenance skills as expected by the industries.

8. Student should develop the habit of pocket discussion / group discussion related to the experiments/ exercises so that

exchanges of knowledge / skills could take place.

9. Student should develop habit to submit the practical, exercise continuously and progressively on the scheduled dates and

should get the assessment done.

10. Student shall attempt to develop related hands - on - skills and gain confidence.

11. Student shall focus on development of skills rather than theoretical or codified knowledge.

12. Student shall visit the nearby workshops, workstation, industries, laboratories, technical exhibitions trade fair etc. even not

included in the Lab Manual. In short, students should have

exposure to the area of work right in the student hood.

13. Student shall develop the habit of evolving more ideas, innovations, skills etc. those included in the scope of the manual.

14. Student shall refer to technical magazines, proceedings of the Seminars, refer websites

related to the scope of the subjects and update their knowledge and skills.

15. The student shall study all the questions given in the laboratory manual and practice to write the answers to these questions.



INDEX

S.NO NAME OF THE EXERCISE

Page No

Date of Performance

Date of Submission

Assessment of Marks (10 Marks)

Sign of Faculty

CYCLE - I

Week 1

a) Find the roots of quadratic equation ax2+bx+c = 0

b) Find the Fibonacci Sequences (Recursive and Non-Recursive)

Week 2

a) Print the all Prime numbers

b) Multiply two given Matrices

c) Sum of all integer Using StringTokenizer class

Week 3

a) To find given string is Palindrome or not

b) Sorting names in ascending order

Week 4

a) Read the file, display and check read/write, find the length of the file

b) Read the file, display file with lines before each line

c) Display the file number of character, lines and words in the text file

Week 5

a) Implement Stack ADT

b) Convert Infix expression to Postfix expression

c) Evaluate Postfix Expression

Week 6a) Display Simple message using Applet

b) Compute Factorial value using Applet

CYCLE - II



Week 7

Write program for simple calculator. Use a grid layout to arrange buttons for the digits and for the + - x / % operations

Week 8Program for handling mouse events and key events

Week 9

a) Create three threads. 1 thread displays “Good Morning” every one second, 2 thread displays “Hello” every 2 seconds and the 3 thread displays “Welcome” every 3 secondsb) Implements Producer- Consumer problem using the concept of Inter Thread communication

Week 10

Create a user interface to perform integer divisions. The user enters two numbers in the text field, Num1 and Num2. The division of Num1 and Num2 is displayed in the Result field when the Divide button is clicked. If Num1 or Num2 were not an integer, the program would throw a Number Format Exception. If Num2 were Zero, the program would an Arithmetic Exception Display the exception in a message dialog box.

Week 11

a) Write a java program that simulates traffic lights. The program lets the user select one of three lights: red, yellow, or green. When a radio button is selected, the light is turned on, and only one light can be on at a time No light is on when the program startsb) Write a Java program that allows the user to draw lines, rectangles and ovals.

Week 12

a) Write a java program to create an abstract class named shape that contains an empty method named number of sides (). Provide three classes named trapezoid, triangle and Hexagon such that each one of the classes extends the class shape. Each one of the class contains only the method number of sides () that shows the number of sides in the given geometrical figuresb) Display a table using JTable component.(Table named table.txt)



Week 1 a) : Program To check the nature of the roots of the Quadratic equation

1. AIM:Write a java program to generate the quadratic equation.

2. Algorithm:

1. Start the program. Import the packages.2. Create a class and variables with data types.3. Declaration of the main class.4. Read a string with InputStreamReader (System. in).5. convert the string into Integer.parseInt(stdin.readLine());6. By using if(d==0) “Roots are Equalent” loop rotating the integer value.7. if(d>0) “Roots are Real” otherwise ("Roots are Imaginary");8. Repeats enter the value until end of loop.9. End of class and main method.10. Stop the program.

3. PROGRAM:

import java.io.*;import java.math.*;class quadratic{ public static void main (String s[]) throws IOException { int a,b,c,d; double r1,r2; Buffered Reader bf=new BufferedReader (new InputStreamReader (System. in)); System.out.println ("Enter value of a:"); a=Integer.parseInt (br.readLine ()); System.out.println ("Enter value of b:"); b=Integer.parseInt (br.readLine ()); System.out.println ("Enter value of c:"); c=Integer.parseInt (br.readLine ()); d=b*b-4*a*c; if (d==0) { System.out.println ("Roots are Equivalent"); r1=-b/(2*a); r2=-b/(2*a); System.out.println ("Root1 = "+r1); System.out.println ("Root2 = "+r2); } else if (d>0) { System.out.println ("Roots are Real"); r1=(-b+Math.sqrt(d))/(2*a); r2=(-b-Math.sqrt(d))/(2*a); System.out.println ("Root1 = "+r1); System.out.println ("Root2 = "+r2); } else System.out.println ("Roots are Imaginary"); }



4. OUTPUT:

Enter value of a:1Enter value of b:2Enter value of c:1Roots are EqualentEnter value of a:2Enter value of b:3Enter value of c:2Roots are Imaginary

Week 1 b) : Program to find the series of Fibonacci by using both Recursive and Non-Recursive 1. AIM:

Write a java program to generate the Fibonacci series of given no. using Non-Recursive. Write a java program to generate the Fibonacci series of given no. using Recursive.

Algorithm:1. Start the program. Import the packages.2. Create a class and variables with data types.3. Declaration of the main class.4. Read a string with Scanner object (System. in).5. convert the string into sc.nextInt();6. call the method fibonacci.7. declare the method fibonacci with parameters f1,f2 and n.8. Initialize the values f1=0,f2=1 and add f1&f2.9. now check the condition until n!=0. 10. call the method Fibonacci() repeateadly until the above condition is false the 11. End of class and main method.12. Stop the program.

3. PROGRAM:// using Non-Recursiveimport java.io.*;import java.util.*;class Fibonacci{public static void main(String args[]) throws IOException{BufferedReader br=new BufferedReader(new InputStreamReader(System.in));System.out.print("Enter the Fibonacci series of:");int n=Integer.parseInt(br.readLine());long f1,f2,f;f1=0;f2=1;System.out.println(f1);System.out.println(f2);f=f1+f2;System.out.println(f);int count=3;while(count<n){f1=f2;f2=f;f=f1+f2;System.out.println(f);count++;



}}}// using Recursive

import java.lang.*; import java.util.Scanner;class Fiborecursion{public static void main(String args[]){int n;Scanner sc=new Scanner(System.in);System.out.println("enter the no.");n=sc.nextInt();fibonacci(0,1,n);}static void fibonacci(int f1,int f2,int n){if(n!=0){System.out.println(f1 + "\t");fibonacci(f2,f1+f2,n-1);}}}

4. OUTPUT:Enter first number: 5Enter second number: 3Addition of a and b = 8Subtraction of a and b=2Multiplication of a and b=15Division of a and b=1.0



Week 2 a) : Program To find the series of prime no.s upto a given no.

1. AIM:Write a java program to generate the prime series of given no.

2. Algorithm:1. Start the program. Import the packages.2. Create a class and variables with data types.3. Declaration of the main class.4. Read a value through commandline arguments.5. Declare the for loop for i and j values.6. check the condition if(i%j==0)7. if it is true then flag=1, so it is prime.8. if it is not true ,so it is prime, then again set flag=0 then continue until the i for loop will be fails.9. End of class and main method.10. Stop the program.

3. PROGRAM:

class Prime{ public static void main(String args[]){int i,j,n,flag=0;// Accepting the value at run time. n=args.length;// Loop to find whether the number is prime or not.for(i=1;i<=n;i++){for(j=2;j<=i-1;j++){if(i%j==0){flag=1;}}// Display whether the number is prime or not.if(flag==1)System.out.println(i+"is not prime");elseSystem.out.println(i+"is prime");flag=0;}}}4. OUTPUT:java Prime 1 2 3 4 5 6 7 8 9 10 // total n=args.length=101is prime2is prime3is prime4is not prime5is prime6is not prime7is prime8is not prime9is not prime10is not prime



Week 2 b) : Program to multiply two given matrices

1. AIM:Write a java program to multiplication of given two matrices.

2. Algorithm:1. Start the program. Import the packages.2. Create a class and variables with data types.3. Declaration of the main class.4. Read m & n values through command line arguments.5. initialize the integer array a[] []& b[][] &c[][] variables6. read the values into a[][] &b[][] in matrix form7. then multiply a[][] & b[][], result stored into c[][].8. display the values of c[][] in matrix form.9. End of class and main method.10. Stop the program.

3. PROGRAM:

int[ ][ ] findMul(int a[ ][ ],int import java.util.*; class Test { int r1,c1,r2,c2; Test(int r1,int c1,int r2,int c2) { this.r1=r1; this.c1=c1; this.r2=r2; this.c2=c2; } int[ ][ ] getArray(int r,int c) { int arr[][]=new int[r][c]; System.out.println("Enter the elements for "+r+"X"+c+" Matrix:"); Scanner input=new Scanner(System.in); for(int i=0;i<r;i++) for(int j=0;j<c;j++) arr[i][j]=input.nextInt(); return arr; } ul(int a[ ][ ],int bt b[ b[ ][ ]) { int c[][]=new int[r1][c2]; for (int i=0;i<r1;i++) for (int j=0;j<c2;j++) { c[i][j]=0; for (int k=0;k<r2;k++) c[i][j]=c[i][j]+a[i][k]*b[k][j]; } return c; } void putArray(int res[ ][ ]) {System.out.println ("The resultant "+r1+"X"+c2+" Matrix is:"); for (int i=0;i<r1;i++)



{ for (int j=0;j<c2;j++) System.out.print(res[i][j]+" "); System.out.println(); } } } //end of Test class class MatrixMul { public static void main(String args[ ])throws IOException { Test obj1=new Test(2,3,3,2); Test obj2=new Test(2,3,3,2); int x[ ][ ],y[ ][ ],z[ ][ ]; System.out.println("MATRIX-1:"); x=obj1.getArray(2,3); //to get the matrix from user System.out.println("MATRIX-2:"); y=obj2.getArray(3,2); z=obj1.findMul(x,y); //to perform the multiplication obj1.putArray(z); // to display the resultant matrix } }

4. OUTPUT

MATRIX-1:Enter the elements for 2*3 matrix:1 1 1 1 1 1MATRIX-2:Enter the elements for 2*3 matrix:1 1 1 1 1 1The resultant 2*2 matrix is:

3 33 3

Week 2 c) : Program To find sum of given line of integers and display the line of integers

1. AIM: Write a java program to find sum of given line of integers

2. Algorithm:1. Start the program. Import the packages.2. Create a class and variables with data types.3. Declaration of the main class.4. Read string value by using BufferedReader class and convert into integer,then stored into n 5. check the while loop as if n>=06. take the modulo of given integer &then add reminder to sum variable.7. divide n by 10 and check while loop8. repeat the while loop until the condition is false9. End of class and main method.10. Stop the program.



3. PROGRAM:\\sum of individual integers

// Using StringTokenizer class import java.lang.*; import java.util.*; class tokendemo { public static void main(String args[ ]) { String s="10,20,30,40,50"; int sum=0; StringTokenizer a=new StringTokenizer(s,",",false); System.out.println("integers are "); while(a.hasMoreTokens()) { int b=Integer.parseInt(a.nextToken()); sum=sum+b; System.out.println(" "+b); } System.out.println("sum of integers is "+sum); } }

// Alternate solution using command line arguments class Arguments { public static void main(String args[ ]) { int sum=0; int n=args.length; System.out.println("length is "+n); int arr[]=new int[n]; for(int i=0;i<n;i++) arr[i]=Integer.parseInt(args[i]); System.out.println("The enterd values are:");for(int i=0;i<n;i++) System.out.println(arr[i]); System.out.println("sum of enterd integers is:"); for(int i=0;i<n;i++) sum=sum+arr[i]; System.out.println(sum); } }

4. OUTPUTIntegers are10203040



50Sum of integers is 150

Week 3 a): Program To find given string is palindrome or not 1. AIM:

Write a java program to find the given string is palindrome or not.

2. Algorithm:

1. Start the program. Import the packages.2. Create a class and variables with data types.3. Declaration of the main class.4. Read string value by using BufferedReader class and assign into temporary variable.5. convert String variable str into StringBuffer class object(sb).6. to reverse the contents of StringBuffer object by using reverse method..7. again convert the StringBuffer object into String object.8. then compare the temporary variable temp and String variable str.9. both are equal then print the relavent statement.10. End of class and main method.11. Stop the program.

3. PROGRAM:import java.io.*;class Palindromestring{public static void main(String args[])throws IOException{BufferedReader br=new BufferedReader(new InputStreamReader(System.in));System.out.println("enter a string:");String str=br.readLine();String temp=str;StringBuffer sb=new StringBuffer(str);sb.reverse();str=sb.toString();if(temp.equalsIgnoreCase(str))System.out.println(temp+ "is a palindrome");elseSystem.out.println(temp+ " is not a palindrome");}}

4. OUTPUT:enter a string: lirillirilis a palindrome enter a string: mechmech is not a palindrome

Week 3 b) : Program To sort the given strings 1. AIM:

Write a java program to sort the given strings in Ascending order.



2. Algorithm:1. Start the program. Import the packages.2. create the implementation class of the Comparator interface with generic data type.3. then implement the method of Comparator interface in implementation class.4. Create another class and variables with data types.5. Declaration of the main class.6. Read string value by using BufferedReader class and convert into integer variable.7. then declare the String array variable Str[]8. then read the strings one by one using for loop into str[]9. then create the object for the implementation class of interface10. then sort the elements by the method Arrays.sort() and sent all the sorted elements to implementation

class11. to check all the elements are sorted or not by using compare() method of interface.12. then display all the elements by using the method of display()13. End of class and main method.14. Stop the program

3. PROGRAM:import java.io.*;import java.util.*;class Ascend implements Comparator<String>{public int compare(String s1,String s2){return s1.compareTo(s2);}}class ArraySorting{public static void main(String args[]) throws IOException{BufferedReader br=new BufferedReader(new InputStreamReader(System.in));System.out.println("how many string:");int size=Integer.parseInt(br.readLine());String str[]=new String[size];for(int i=0;i<size;i++){System.out.println("enter the string:");str[i]=br.readLine();}Ascend str1=new Ascend();Arrays.sort(str,str1);System.out.println("sorted elements in ascending order are:");display(str);}static void display(String str[]){for(String i:str)System.out.println(i+"\t");}}4. OUTPUT:how many string: 5enter the string: ramenter the string: raj



enter the string: syamenter the string: rakeshenter the string: saisorted elements in ascending order are:rajrakeshramsaisyam

Week 4 a): Write a Java program to check the file properties.

1. AIM:Write a java program to check the file properties like... it is exist, is it readable, writable, its type, its

length in terms of bytes.

2. Algorithm:1. Start the program. 2. Import the packages.3. Create a class variable to read the file name through command prompt.4. Create the File class object and assign the file name to file class object.5. Then get all the properties of file using File class methods.6. Then print all the properties (sb).7. End of class and main method.8. stop the program

3. PROGRAM:

import java.io.*;class Fileprop{public static void main(String args[]){String fname=args[0];File f=new File(fname);System.out.println("filename:"+f.getName());System.out.println("path:"+f.getPath());System.out.println("absolute path:"+f.getAbsolutePath());System.out.println("parent:"+f.getParent());System.out.println("exists:"+f.exists());if(f.exists()){System.out.println("is writable:"+f.canWrite());System.out.println("is readable:"+f.canRead());System.out.println("is a directory:"+f.isDirectory());System.out.println("file size in bytes:"+f.length());}}}

4. OUTPUT:filename:Prime.javapath:Prime.javaabsolute path:D:\ramsir\546\Prime.java



parent:nullexists:trueis writable:trueis readable:trueis a directory:falsefile size in bytes:489



Week 4 b): Write a Java program that reads a file and displays the file on the screen, with a line number before each line.

1. AIM:Write a java program to read the file and displays its contents with line no.s before each line

2. Algorithm:1. Start the program. Import the packages.2. Create a class and variables with data types.3. Declaration of the main class.4. Read a string with inputstreamReader(System.in).5. convert the string into Integer.parseInt(stdin.readLine());6. By using for loop rotating the integer value.7. Repeats enter the value until end of loop.8. End of class and main method.9. Stop the program.

3. PROGRAM:// Import the packages to access FileStream classes.

import java.io.*;class file2{public static void main(String args[]) throws Exception{// Creating FileInputStream and read the data in abc.java.FileInputStream f1=new FileInputStream("abc.java");int n=f1.available();System.out.println(n);int j=1;// Loop to read the contents of file and display the content.for(int i=0;i<n;i++){char ch=(char)f1.read();char c='\n';// loop to check whether it is the end of the lineif(c==ch){System.out.print(""+j);j++;}System.out.print(ch);}}}

// The data in abc.java.

abc.java

class abc{

public static void main(String args[]){



}}

4. OUTPUT1 class abc2{3 public static void main(String args[])4 {5 }6}

Week 4 c): Write a Java program that displays the number of characters, lines and words in a text file.1. AIM:

Write a java program to read the file and displays no. of characters, words and lines in that.. 2. Algorithm:

1. Start the program and Import the packages.2. Create a class and variables with data types.3. Declaration of the main class.4. Read filename into FileInputStream through command prompt5. take the characters one by one from the file and stored into ch.6. count the no. of characters if ‘ch’ is not space character7. count the no. of words if ‘ch’ is space character and previous character is not space character.8. count the no. lines if ‘ch’ is new line character (or) if ‘ch’ is newline character and ‘ch’ is ‘.’ 9. print the no. of characters, words and lines..10. close the main and class.11. Stop the program.

3. PROGRAM:import java.io.*;public class Countcwl{public static void main(String args[]) throws IOException{int ch;boolean prev=true;int char_count=0;int word_count=0;int line_count=0;FileInputStream fin=new FileInputStream(args[0]);while((ch=fin.read())!=-1){if(ch!=' ')++char_count;if(!prev && ch==' ')++word_count;if(ch==' ')prev=true;else prev=false;if(ch=='\n'||(ch=='.'&&ch=='\n'))}char_count -=line_count*2;word_count +=line_count;System.out.println("no of chars:"+char_count);System.out.println("no of words:"+word_count);System.out.println("no of lines:"+line_count);fin.close();}



}

4. OUTPUT : java Countcwl abc.javano of chars:52no of words:9no of lines:5

Week 5 a) : program implementation of stack ADT

1. AIM: Write a java program to implement the stack ADT(Abstract Data Type).

2. Algorithm:1. Start the program. Import the packages.2. Create a class and variables with data types.3. Declaration of the main class.4. create and implements the methods for push(), pop(), and search()5. then read the particular option from the keyboard6. then the relevant task will be executed 7. if u select choice1 then the push operation will be executed8. if u select choice2 then the pop operation will be executed9. if u select choice3 then the search operation will be executed10. if u select choice4 then exit from the stack and from the program11. Close the main and class.12. Stop the program.

3. PROGRAM:// Import the packages.import java.io.*;import java.lang.*;import java.util.*;

// Class to perform operations of push, pop,search an element.

class stack{public static void main(String args[]) throws Exception{Stack<Integer> st=new Stack<Integer>();int choice=0;int position,element;BufferedReader br=new BufferedReader(new InputStreamReader(System.in));while(choice<4){System.out.println("Stack Operations");System.out.println("1. Push an element");System.out.println("2.Pop an element");System.out.println("3.Search an element");System.out.println("Enter your choice");// Assigning the value to perform the operation.choice=Integer.parseInt(br.readLine());// Switch case to perform the operation.

switch(choice) {



// Operation to be performed when entering the element.case 1:System.out.println("Enter an element");element = Integer.parseInt(br.readLine());st.push(element);break;// Operation to be performed when getting the element.case 2:System.out.println("Which element ? ");Integer obj = st.pop();System.out.println("Poped element= "+obj);break;// Operation to be performed to search the element.case 3:System.out.println("Which an element ? ");element = Integer.parseInt(br.readLine());position = st.search(element);// Loop to display the element and position.if(position==-1)System.out.println("Element not found");elseSystem.out.println("postion of the element is:= "+position);break;default:return;}}}}4. OUTPUT:

Stack Operations1. Push an elemen2.Pop an element3.Search an elemeEnter your choice1Enter an element34Stack Operations1. Push an elemen2.Pop an element3.Search an elemeEnter your choice2Which element ?Poped element= 34Stack Operations1. Push an elemen2.Pop an element3.Search an elemeEnter your choice 4



Week 5 b) : Converts infix to postfix form

1. AIM:Write a java program that converts infix to postfix form

2. Algorithm:1. Import the package to access classes in io package.2. Class to display the elements.3. Method to initialize stack size 4. Method to enter the elements into the stack.5. Method to get the elements from the stack.6. Method to get the top element of the stack.7. Method to check whether the stack is empty.8. Method to return the size of the stack.9. Method to return the element in stack array.10. Method to display the stack contents.11. Class to convert infix to postfix.12. Method to convert infix to postfix.13. Method to check the characters and perform the operation14. Method to check the precedence of the characters and 15. Perform the operation.16. Class that takes infix form and converts it into postfix form using 17. Methods in into Post class.18. Loop that takes the infix form.19. Create object of InToPost.20. Call the method in InTopost class21. Displays the postfix form.22. Creates objects of the stream readers and BufferReader.

3. PROGRAM:// Import the package to access classes in io package.

import java.io.*;

// Class to display the elements .

class StackX{private int maxSize;private char[] stackArray;private int top;// Method to initialize stack size .public StackX(int s){maxSize=s;stackArray=new char[maxSize];top=-1;}// Method to enter the elements into the stack.public void push(char j)



{stackArray[++top]=j;}// Method to get the elements from the stack.public char pop(){return stackArray[top--];}// Method to get the top element of the stack.public char peek(){return stackArray[top];}// Method to check whether the stack is empty.public boolean isEmpty(){return (top==-1);}/ / Method to return the size of the stack.public int size(){return top+1;}// Method to return the element in stack array.public char peekN(int n){return stackArray[n];}// Method to display the stack contents.public void displayStack(String s){System.out.println(s);System.out.print("stack(bottom-->top:");for(int j=0;j<size();j++){System.out.print(peekN(j));}System.out.println(" ");}}// Class to convert infix to postfix.class InToPost{private StackX theStack;private String input;private String output;// Method to convert infix to postfix.public InToPost(String in){input=in;int stackSize=input.length();theStack=new StackX(stackSize);}// Method to check the characters and perform the operation.public String doTrans(){



for(int j=0;j<input.length();j++){char ch=input.charAt(j);theStack.displayStack("For"+ch+" ");switch(ch){case '+':case '-':gotOper(ch,1);break;case '*':case '/':case '_':gotOper(ch,2);break;case '(':theStack.push(ch);break;case ')':gotParen(ch);break;default:output=output+ch;break;}}while(!theStack.isEmpty()){theStack.displayStack("while");output=output+theStack.pop();}theStack.displayStack("End");return output;}// Method to check the precedence of the characters and // perform the operation.public void gotOper(char opThis,int prec1){while(!theStack.isEmpty()){char opTop=theStack.pop();if(opTop=='('){theStack.push(opTop);break;}else{int prec2;if(opTop=='+'||opTop=='-')prec2=1;elseprec2=2;if(prec2 < prec1){theStack.push(opTop);



break;}elseoutput=output+opTop;}}theStack.push(opThis);}public void gotParen(char ch){while(!theStack.isEmpty()){char chx=theStack.pop();if(chx=='(')break;elseoutput=output+chx;}}}// Class that takes infix form and converts it into postfix form using // methods in inToPost class.class InfixApp{public static void main(String args[]) throws IOException{String input,output;// Loop that takes the infix form.while(true){System.out.print("enter infix");input=getString();if(input.equals(""))break;// Create object of InToPost.InToPost theTrans=new InToPost(input);// Call the method in InTopost class.output=theTrans.doTrans();// Displays the postfix form.System.out.println("postfix is "+output+"\n");}}public static String getString() throws IOException{// Creates objects of the stream readers and BufferReader.InputStreamReader isr=new InputStreamReader(System.in);BufferedReader br=new BufferedReader(isr);String s=br.readLine();return s;}}

4. OUTPUTInput: Enter infix 5*(8+3*7)+22



Output: Forstack(bottom-->top:For5stack(bottom-->top:For*stack(bottom-->top:For(stack(bottom-->top:*For8stack(bottom-->top:*(For+stack(bottom-->top:*(For3stack(bottom-->top:*(+For*stack(bottom-->top:*(+For7stack(bottom-->top:*(+*For)stack(bottom-->top:*(+*For+stack(bottom-->top:*For2stack(bottom-->top:+For2stack(bottom-->top:+whilestack(bottom-->top:+Endstack(bottom-->top:postfix is null 5837*+*22+

Week 6 a): Write an Applet that displays a simple message.

1. AIM:Write a java program to create an applet and displays a simple message on the screen.

2. Algorithm:1. Start the program. Import the packages.2. Create a class and extends with Applet.3. call the paint() method of graphics class object4. using graphics class object call the graphics class methods5. i.e call the drawstring() method to display the message on the applet6. compile the java file and get java byte code file7. create an applet in a separate file using html tags8. include the java byte code file into an applet using code attribute 9. Execute the applet code using Appletviewer command at command prompt.

3. PROGRAM: Applet1.java:

// Import the packages to access the classes and methods in awt and applet classes.

import java.awt.*;import java.applet.*;public class Applet1 extends Applet



{// Paint method to display the message.public void paint(Graphics g){g.drawString("HELLO WORLD",20,20);}}

Applet1.html:

/* <applet code="Applet1" width=200 height=300></applet>*/

4. OUTPUT:

Week 6 b): ) Develop an applet that receives an integer in one text field, and computes its factorial value and returns it in another text field, when the button named “compute” is clicked1. AIM:

Write an applet that computes the payment of a loan. 2. Algorithm:1. Import the packages.2. Applet program that calculates the principle.3. Creation of labels.4. Creation of textfields.5. Add controls to the applet viewer.6. Add Listeners to perform the action.7. Implementing the method in action listener.8. Display the output on the applet viewer.

3. PROGRAM: // Import the packages.



import java.awt.*;import java.awt.event.*;import java.applet.*;

// Applet program that calculates the principle.

public class prin extends Applet implements ActionListener{

TextField t1,mon,intr,prin;String msg="";

// Initialize the applet.

public void init(){

// Creation of labels.

Label l1=new Label("amount");Label l2=new Label("months");Label l3=new Label("Intrest");Label l4=new Label("principle");

// Creation of textfields.

t1=new TextField(10);mon=new TextField(10);intr=new TextField(10);prin=new TextField(20);

// Add controls to the applet viewer.

add(l1);add(t1);add(l2);add(mon);add(l3);add(intr);add(l4);add(prin);

// Add Listeners to perform the action.

t1.addActionListener(this);mon.addActionListener(this);intr.addActionListener(this);prin.addActionListener(this);

}int x,x1,x2;

// Implementing the method in action listener.

public void actionPerformed(ActionEvent ae){

repaint();



}

// Display the output on the applet viewer.

public void paint(Graphics g){

g.drawString("amount"+t1.getText(),100,100);g.drawString("months"+mon.getText(),100,120);g.drawString("intrest"+intr.getText(),100,160);String s1=t1.getText();String s2=mon.getText();String s3=intr.getText();int x=Integer.parseInt(s1);int x1=Integer.parseInt(s2);int x2=Integer.parseInt(s3);int x4=(x*x1*x2)/100;int pri=(x+x4);String s4="";s4=s4+pri;print.setText(s4);

}}

4. OUTPUT:

Week 7 : Develop an Grid layout by creating calculator

1. AIM:

Write a java program that works as a simple calculator. Use a Grid Layout to arrange Buttons for digits and for the + - * % operations. Add a text field to display the result.

2. Algorithm:1. Start the program. Import the packages.2. Create class that initialize the applet and create calculator.3. Class that creates the calculator panel.4. Creation of JButton.5. Create the JObjectPane 6. Creation of control panel of calculator and adding buttons

Using GridLayout



7. Implementing method in ActionListener 8. create an applet in a separate file using html tags9. include the java byte code file into an applet using code attribute 10. Execute the applet code using Appletviewer command at command prompt.

3. PROGRAM:// Import the javax , awt packages and the classes.

import javax.swing.*;import javax.swing.JOptionPane;import java.awt.*;import java.awt.event.*;// Class that initialize the applet and create calculator.public class Calculator extends JApplet {public void init() {CalculatorPanel calc=new CalculatorPanel();getContentPane().add(calc);}}// Class that creates the calculator panel .class CalculatorPanel extends JPanel implements ActionListener{// Creation of JButton.JButton n1,n2,n3,n4,n5,n6,n7,n8,n9,n0,plus,minus,mul,div,dot,equal;static JTextField result=new JTextField("0",45);static String lastCommand=null;// Create the JObjectPane.JOptionPane p=new JOptionPane();double preRes=0,secVal=0,res;private static void assign(String no){if((result.getText()).equals("0"))result.setText(no);else if(lastCommand=="="){result.setText(no);lastCommand=null;}elseresult.setText(result.getText()+no);}// Creation of control panel of calculator and adding buttons // using GridLayout.public CalculatorPanel(){setLayout(new GridLayout());result.setEditable(false);result.setSize(300,200);add(result);JPanel panel=new JPanel();panel.setLayout(new GridLayout(5,5));n7=new JButton("7");panel.add(n7);



n7.addActionListener(this);n8=new JButton("8");panel.add(n8);n8.addActionListener(this);n9=new JButton("9");panel.add(n9);n9.addActionListener(this);div=new JButton("/");panel.add(div);div.addActionListener(this);n4=new JButton("4");panel.add(n4);n4.addActionListener(this);n5=new JButton("5");panel.add(n5);n5.addActionListener(this);n6=new JButton("6");panel.add(n6);n6.addActionListener(this);mul=new JButton("*");panel.add(mul);mul.addActionListener(this);n1=new JButton("1");panel.add(n1);n1.addActionListener(this);n2=new JButton("2");panel.add(n2);n2.addActionListener(this);n3=new JButton("3");panel.add(n3);n3.addActionListener(this);minus=new JButton("-");panel.add(minus);minus.addActionListener(this);dot=new JButton(".");panel.add(dot);dot.addActionListener(this);n0=new JButton("0");panel.add(n0);n0.addActionListener(this);equal=new JButton("=");panel.add(equal);equal.addActionListener(this);plus=new JButton("+");panel.add(plus);plus.addActionListener(this);add(panel);}// Implementing method in ActionListener.public void actionPerformed(ActionEvent ae){if(ae.getSource()==n1) assign("1");else if(ae.getSource()==n2) assign("2");else if(ae.getSource()==n3) assign("3");else if(ae.getSource()==n4) assign("4");else if(ae.getSource()==n5) assign("5");



else if(ae.getSource()==n6) assign("6");else if(ae.getSource()==n7) assign("7");else if(ae.getSource()==n8) assign("8");else if(ae.getSource()==n9) assign("9");else if(ae.getSource()==n0) assign("0");else if(ae.getSource()==dot){if(((result.getText()).indexOf("."))==-1)result.setText(result.getText()+".");}else if(ae.getSource()==minus){preRes=Double.parseDouble(result.getText());lastCommand="-";result.setText("0");}else if(ae.getSource()==div){preRes=Double.parseDouble(result.getText());lastCommand="/";result.setText("0");}else if(ae.getSource()==equal){secVal=Double.parseDouble(result.getText());if(lastCommand.equals("/"))res=preRes/secVal;else if(lastCommand.equals("*"))res=preRes*secVal;else if(lastCommand.equals("-"))res=preRes-secVal;else if(lastCommand.equals("+"))res=preRes+secVal;result.setText(" "+res);lastCommand="=";}else if(ae.getSource()==mul){preRes=Double.parseDouble(result.getText());lastCommand="*";result.setText("0");}else if(ae.getSource()==plus){preRes=Double.parseDouble(result.getText());lastCommand="+";result.setText("0");} }}

Calculator.html

<applet code="Calculator" width=200 height=300></applet>



1. OUTPUT:

Week 8: Write a Java program for handling mouse events

1. AIM:

Write a java program to implement the APPLET PACKAGES, draw Mouse event handler programs.

2. Algorithm:1. Import the packages awt and applet.2. Class that handles mouse events. 3. Method to initialize the applet.4. Method to handle mouse clicked event.5. Method to handle mouse entered event.6. Method to handle mouse entered event.7. Method to handle mouse pressed event.8. Method to handle mouse relesed event.9. Method to handle mouse dragged event.10.Method to handle mouse moved event .11.Method to display the message.

3. Program:import java.awt.*;



import java.applet.*;import java.awt.event.*;public class MouseDemo extends Applet implements MouseListener,MouseMotionListener{int mx=0;int my=0;String msg="";public void init(){addMouseListener(this);addMouseMotionListener(this);}public void mouseClicked(MouseEvent me){mx=20;my=40;msg="Mouse Clicked";repaint();}public void mousePressed(MouseEvent me){mx=30;my=60;msg="Mouse Pressed";repaint();}public void mouseReleased(MouseEvent me){mx=30;my=60;msg="Mouse Released";repaint();}public void mouseEntered(MouseEvent me){mx=40;my=80;msg="Mouse Entered";repaint();}public void mouseExited(MouseEvent me){mx=40;my=80;msg="Mouse Exited";repaint();}public void mouseDragged(MouseEvent me){mx=me.getX();my=me.getY();showStatus("Currently mouse dragged"+mx+" "+my);repaint();}public void mouseMoved(MouseEvent me){



mx=me.getX();my=me.getY();showStatus("Currently mouse is at"+mx+" "+my);repaint();}public void paint(Graphics g){g.drawString("Handling Mouse Events",30,20);g.drawString(msg,60,40);}}

/* <html><title>mouse motions</title><applet code="MouseDemo1" width=300 height=300></applet></html> */

4. OUTPUT:



Week 9 a) : Write a Java program to create thread communication.1. AIM:

Write a Java program that creates three threads. First thread displays “Goof Morning” every one second the second thread displays “Hello” every two seconds and the the third thread displays “Welcome” every three seconds2. Algorithm:

1. start the program2. create the first thread3. call the run() method4. sleep the first thread 1sec5. create the second thread6. call the run() method7. sleep the second thread for 2sec8. create the third thread9. call the run() method10. sleep the third thread 3sec11. create the main class12. open the main method13. create the thread class object14. create the objects for threads one, two, three15. start the first thread16. after 1sec sleep the first thread and start the second thread17. after 2 sec sleep the second and first thread ,then start the third thread18. Stop the program.

3. PROGRAM:

// Using Thread class class One extends Thread { public void run() { for ( ; ; ) { Try{ sleep(1000); }catch(InterruptedException e){} System.out.println("Good Morning"); } } } class Two extends Thread { public void run() { for ( ; ; ) { Try{ sleep(2000); }catch(InterruptedException e){}



System.out.println("Hello"); } } } class Three extends Thread { public void run() { for ( ; ; ) { Try{ sleep(3000); }catch(InterruptedException e){}System.out.println("Welcome"); } } } class MyThread { public static void main(String args[ ]) { Thread t = new Thread(); One obj1=new One(); Two obj2=new Two(); Three obj3=new Three(); Thread t1=new Thread(obj1); Thread t2=new Thread(obj2); Thread t3=new Thread(obj3); t1.start(); try{ t.sleep(1000); }catch(InterruptedException e){} t2.start(); try{ t.sleep(2000); }catch(InterruptedException e){} t3.start(); try{ t.sleep(3000); }catch(InterruptedException e){} } }



// Using Runnable interface class One implements Runnable { One( ) { new Thread(this, "One");start(); try{ Thread.sleep(1000); }catch(InterruptedException e){} }public void run() { for ( ; ; ) { try{ Thread.sleep(1000); }catch(InterruptedException e){} System.out.println("Good Morning"); } } }class Two implements Runnable { Two( ) { new Thread(this, "Two")start(); try{ Thread.sleep(2000); }catch(InterruptedException e){} } public void run() { for ( ; ; ) { Try{ Thread.sleep(2000); }catch(InterruptedException e){} System.out.println("Hello"); } } } class Three implements Runnable {



Three( ) { new Thread(this, "Three").start(); try{ Thread.sleep(3000); }catch(InterruptedException e){} } public void run() { for ( ; ; ) { Try{ Thread.sleep(3000); }catch(InterruptedException e){} System.out.println("Welcome"); } } } class MyThread { public static void main(String args[ ]) { One obj1=new One(); Two obj2=new Two(); Three obj3=new Three(); } }

4. OUTPUT:Good morningGood morningHelloGood morningGood morningHelloGood morningWelcomeGood morningHelloGood morningGood morning



Week 9 b) : Program To write producer consumer problem 1. AIM:Write a java program that correctly implements the producer consumer Problem using the concept of inter theread communication.2. Algorithm:

1. Start the program. Import the packages.2. create the class for synchronized block to communicating threads3. create the code for producer and consumer4. create the main class and main method5. Synchronizing the Producer Consumer through interprocess communication.6. end of the main7. end of class.8. Stop the program.

3. PROGRAM:

class Q{

int n;boolean value=false;

//Communicating the threads.

synchronized int get(){

if(!value)try{

wait();}catch(InterruptedException e){

System.out.println("Interrupted Exception caught");}System.out.println("Got"+n);value=false;notify();return n;

}synchronized void put(int n){

if(value)try{

wait();}catch(InterruptedException e){

System.out.println("Interrupted Exception caught");}this.n=n;value=true;System.out.println("Put"+n);notify();



}}class Producer implements Runnable{

Q q;

// Code for Producer.

Producer(Q q){

this.q=q;new Thread(this,"producer").start();

}public void run(){

int i=0;while(true){

q.put(i++);}

}}

class Consumer implements Runnable{

Q q; // Code for Consumer.

Consumer(Q q){

this.q=q;new Thread(this,"consumer").start();

}public void run(){

int i=0;while(true){

q.get();}

}}class pc{

public static void main(String args[]){

Q q=new Q();

// Synchronizing the Producer Consumer thru // interprocess communication.

new Producer(q);new Consumer(q);System.out.println("Print ctrl-c to stop");

}



}

4. OUTPUT:

Got11946Put11947Got11947Put11948Got11948Put11949Got11949Put11950Got11950Put11951Got11951Put11952Got11952Put11953Got11953Put11954Got11954Put11955Got11955Put11956Got11956Put11957Got11957

Week 11 a) :Write a java program to simulate a traffic light.

1. AIM:

Write a java program to simulate a traffic light. The program lets the user select one pf the three lights: red, yellow or green. When a radio button is selected, the light is turned on and only one light can be on at a time no light is on when program starts.

2. Algorithm:

1. Start the program. Import the packages.2. Class that allows user to select the traffic lights.3. Add the buttons to the container.4. Add listeners to perform action5. Implement methods in Item Event class.6. create the main class 7. Close the main and class.8. Stop the program.

3. PROGRAM:// Import the packages.import javax.swing.*;import java.awt.*;import java.awt.event.*;

// Class that allows user to select the traffic lights.



public class Trafficlight extends JFrame implements ItemListener{

JRadioButton redbut,yellowbut,greenbut;public Trafficlight(){

Container c = getContentPane();c.setLayout(new FlowLayout());// Create the button group.ButtonGroup group= new ButtonGroup();redbut = new JRadioButton("Red");yellowbut = new JRadioButton("Yellow");greenbut = new JRadioButton("Green");group.add(redbut);group.add(yellowbut);group.add(greenbut);// Add the buttons to the container.c.add(redbut);c.add(yellowbut);c.add(greenbut);// Add listeners to perform actionredbut.addItemListener(this);yellowbut.addItemListener(this);greenbut.addItemListener(this);

addWindowListener(new WindowAdapter(){

// Implement methods in Window Event class.public void windowClosing(WindowEvent e){

System.exit(0);}

} );setTitle("Traffic Light ");setSize(250,200);setVisible(true);

}// Implement methods in Item Event class.public void itemStateChanged(ItemEvent e){

String name= " ",color=" ";if(redbut.isSelected() )name = "Red";else if(yellowbut.isSelected() )name = "Yellow";else if(greenbut.isSelected() )name = "Green";JOptionPane.showMessageDialog(null,"The "+name+" light is simulated,

"MessgeBox", JOptionPane.INFORMATION_MESSAGE);}public static void main(String args[] ){

new trafficlight();}

}



4. OUTPUT:

Week 11 b) :Program to draw Lines, Rectangles, Rounded Rectangles, filled Polygons and Ovals

1. AIM:Write a java program to implement the APPLET PACKAGES, draw Lines, Rectangles, Rounded

Rectangles, filled Polygons programs.

2. Algorithm:1. Start the program.2. Import the packages of applet,awt,awt.event.3. Create a classes: public void paint(Graphics g).4. Assume the values of string, color and font.5. g.drawString() application of Graphical User Interface.6. Printing in the separated Applet viewer window.7. Stop the program.

3. PROGRAM:import java.awt.*;import java.applet.*;import java.awt.event.*;/*<applet code="ShapeDemo" width=300 height=300></applet*/public class ShapeDemo extends Applet{public void paint(Graphics g){setLayout(new FlowLayout());g.drawLine(10,20,50,20);g.drawRect(20,30,30,30);g.setColor(Color.RED);g.fillRect(20,30,30,30);g.drawRoundRect(20,70,50,70,15,15);



g.setColor(Color.GREEN);g.fillRoundRect(20,70,50,70,15,15);g.drawOval(20,150,50,50);g.setColor(Color.BLUE);g.fillOval(20,150,50,50);}}

4. OUTPUT:

Week 12 a) : Write a java program to create an abstract class named shape that contains an empty method named number of sides (). Provide three classes named trapezoid, triangle and Hexagon such that each one of the classes extends the class shape. Each one of the class contains only the method number of sides () that shows the number of sides in the given geometrical figures

1. AIM:To implements a program shows the number of sides in the given geometrical figures

2. Algorithm:import java.io.*;import java.

abstract class shape{ void numberofsides(){ System.out.println("This is for abstract class");}}class Trapezoid extends shape{



void numberofsides(){System.out.println("Trapezoid having 4 sides");}}class Triangle extends shape{ void numberofsides(){System.out.println("Triangle having 3 sides");}}class Hexagonal extends shape{ void numberofsides(){System.out.println("Hexagonal having 6 sides");}}class AbstractDemo{public static void main(String args[]){ Trapezoid tz=new Trapezoid();Triangle t=new Triangle();Hexagonal h=new Hexagonal();tz.numberofsides();t.numberofsides();h.numberofsides();}}

Output

It is having 4 sidesit is having 3 sidesit is having 6 sides

Week 12 b) : Program to implement BorderLayout

1. AIM:Write a java program to implement the APPLET PACKAGES, Create Border layout of window.

2. Algorithm:1. Start the program.2. Import the packages of applet, awt, awt.event.3. Create classes and methods.4. Declare the Border Layout directions.5. Application of Graphical User Interface.6. Printing in the separated Applet viewer window.7. Stop the program.

3. PROGRAM:import java.awt.*;import java.awt.event.*;



import java.applet.*;/*<applet code = "BorderDemo" width=300 height=300></applet> */public class BorderDemo extends Applet{ public void init( ) { setLayout(new BorderLayout( ));

add(new Button("CSE students"),BorderLayout.NORTH); add(new Label("studying well"),BorderLayout.SOUTH); add(new Button("right"),BorderLayout.EAST); add(new Button("left"),BorderLayout.WEST);

String msg = "This is the Demo for BorderLayout"+"done by Cse-1 students"; add(new TextArea(msg),BorderLayout.CENTER); }}

4. OUTPUT


balakrishna java lab manual

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