java Exception异常使用

e.getCause()使用

	@Test
	public void test1() {
		try {
			try {
				try {
					int i = 1 / 0;
				} catch (Exception e) {
					throw new CompletionException("asdf", e);
				}
			} catch (Exception e) {
				throw new RuntimeException("asdf", e);
			}
		} catch (Exception e) {
			System.out.println(e.getMessage());
			System.out.println(e.getCause());
			System.out.println(e.getCause().getCause());
		}
	}

测试结果：

asdf
java.util.concurrent.CompletionException: asdf
java.lang.ArithmeticException: / by zero

堆栈信息保存

	@Test
	public void test2() {
		try {
			List<String> list = null;
			list.add("");
		} catch (Exception e) {
			StackTraceElement[] stackTrace = e.getStackTrace();
			System.out.println(e);
			for (StackTraceElement stackTraceElement : stackTrace) {
				System.out.println(String.format("	at %s", stackTraceElement));
			}
		}
	}

打印信息

java.lang.NullPointerException
	at test.MyExceptionTest.test2(MyExceptionTest.java:49)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:498)
	at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:50)
	at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
	at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47)
	at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
	at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:325)
	at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:78)
	at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:57)
	at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290)
	at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71)
	at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)
	at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58)
	at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268)
	at org.junit.runners.ParentRunner.run(ParentRunner.java:363)
	at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:89)
	at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:41)
	at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:541)
	at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:763)
	at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:463)
	at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:209)

待添加…

最后

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