【JAVA】Java 異常中e的getMessage()和toString()方法的異同

參考連接

示例代碼1:

public class TestInfo {
    private static String str =null;
    public static void main(String[] args) {
        System.out.println("test exception");
        try {
            if(str.equals("name")){
                System.out.println("test exception");
            }
        } catch (Exception e) {
            System.out.println(e.toString());
            System.out.println(e.getMessage());
        }
    }
}

輸出結果:

java.lang.NullPointerException
nulljava

示例代碼2:

public class TestInfo {
    private static int m = 0;
    public static void main(String[] args) {
        System.out.println("test exception");
        try {
            m = 899/0;
        } catch (Exception e) {
            System.out.println(e.toString());
            System.out.println(e.getMessage());
        }
    }
}

輸出結果:

java.lang.ArithmeticException: / by zero
/ by zero.net

總結:

  • e.toString():  得到異常種類和錯誤信息

  • e.getMessage():得到錯誤信息

  • e.printStackTrace():在控制檯打印出異常種類,錯誤信息和出錯位置等

END

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