Java 异常Exception e中e的getMessage()和toString()方法的区别

时间:2021-04-02 18:42:29
示例代码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());
        }
    }
}

输出结果:

java.lang.NullPointerException

null

示例代码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());
        }
    }
}

输出结果:

java.lang.ArithmeticException: / by zero

/ by zero

总结:由此可以看出,e.toString()获取的信息包括异常类型异常详细消息,而e.getMessage()只是获取了异常的详细消息字符串。