JAVA主动抛异常的几种方式及捕捉结果输出对比

时间 2019-11-06

标签 java 主动异常几种方式捕捉结果输出对比栏目 Java 繁體版

原文原文链接

测试代码：java

/**
     * 测试异常抛出及捕捉
     */
    @Test
    public void test() {
        try {
            this.testA();
        } catch (Exception ex) {
            System.out.println(CoreUtils.exceptionToString(ex));
        }
    }

    /**
     * 测试测试
     */
    private void testA() {
        try {
            String a = null; a.length();
        } catch (Exception ex) {
           //各类继续抛出异常的方式
        }
    }

1. throw ex测试

java.lang.NullPointerException
com.differ.jackyun.jackyunassservice.service.others.HgwTest.testA(HgwTest.java:35)
com.differ.jackyun.jackyunassservice.service.others.HgwTest.test(HgwTest.java:25)
sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
java.lang.reflect.Method.invoke(Method.java:498)
org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:50)
org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47)
org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:26)
......

2. throw new RuntimeException(ex)this

java.lang.RuntimeException: java.lang.NullPointerException
com.differ.jackyun.jackyunassservice.service.others.HgwTest.testA(HgwTest.java:38)
com.differ.jackyun.jackyunassservice.service.others.HgwTest.test(HgwTest.java:25)
sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
java.lang.reflect.Method.invoke(Method.java:498)
org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:50)
org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47)
org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:26)
......

3. throw new RuntimeException("执行某个功能发生异常", ex)lua

java.lang.RuntimeException: 执行某个功能发生异常
com.differ.jackyun.jackyunassservice.service.others.HgwTest.testA(HgwTest.java:41)
com.differ.jackyun.jackyunassservice.service.others.HgwTest.test(HgwTest.java:26)
sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
java.lang.reflect.Method.invoke(Method.java:498)
org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:50)
org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47)
org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:26)
......

4. throw new RuntimeException("执行某个功能发生异常：" + CoreUtils.exceptionToString(ex))spa

java.lang.RuntimeException: 执行某个功能发生异常：java.lang.NullPointerException
com.differ.jackyun.jackyunassservice.service.others.HgwTest.testA(HgwTest.java:35)
com.differ.jackyun.jackyunassservice.service.others.HgwTest.test(HgwTest.java:25)
sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
java.lang.reflect.Method.invoke(Method.java:498)
org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:50)
org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47)
org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:26)
......

总结：第3种方式抛出的异常（即：throw new RuntimeException("执行某个功能发生异常", ex)），会丢失关键的异常缘由，故开发时慎用！！！code