exception api 元件 基礎語法 -...
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¡ Exception ¡ API 元件
§ 字串與正規演算式 § 日期與數字的格式化 § printf, Console, Scanner
¡ 基礎語法
¡ Checked/UnChecked Exception ¡ try…catch…finally ¡ 在方法上定義throws XXXException ¡ 用assert來幫助除錯
§ 不應在public方法中用assert來檢查參數 § assert的運算式中不應產生副作用
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class A { public void method1() { try { B b = new B(); b.method2(); } catch (TestException ex) { throw new RuntimeException(); } } } class B { public void method2() throws TestException { throw new TestException(); } } class TestException extends Exception {}
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¡ String + Regular Expression ¡ StringBuffer, StringBuilder ¡ NumberFormat, DateFormat, Locale ¡ Console ¡ Scanner
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¡ 流程控管 § if...else § switch…case § 迴圈
¡ 運算子 ¡ 類別、變數、方法
§ 存取範圍 ¡ 陣列
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¡ 命令列參數 ¡ -D ¡ -ea ¡ -classpath
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