本篇内容主要讲解“Java异常处理UncaughtExceptionHandler如何使用”，感兴趣的朋友不妨来看看。本文介绍的方法操作简单快捷，实用性强。下面就让小编来带大家学习“Java异常处理UncaughtExceptionHandler如何使用”吧!
异常处理
线程未捕获异常 UncaughtException 需要UncaughtZExceptionHandler 来进行处理
那么为什么非要用UncaughtZExceptionHandler呢？
主线程可以轻松捕获线程，子线程不可以
从下面代码可知，即使子线程抛出异常，主线程丝毫不受影响
public class ChildException implements Runnable{ public static void main(String[] args) { new Thread(new ChildException()).start(); for (int i = 0; i < 10; i++) { System.out.println(i); } } @Override public void run() { throw new RuntimeException(); }}从下面代码可知，即使想用catch捕获子线程异常，时没有用的
try catch 是针对主线程的，没有办法捕获子线程的异常
public class CantCatch implements Runnable { public static void main(String[] args) throws InterruptedException { try { new Thread(new CantCatch(), "thread0").start(); Thread.sleep(300); new Thread(new CantCatch(), "thread1").start(); Thread.sleep(300); new Thread(new CantCatch(), "thread2").start(); Thread.sleep(300); new Thread(new CantCatch(), "thread3").start(); Thread.sleep(300); } catch (RuntimeException e) { System.out.println("catch"); } } @Override public void run() { throw new RuntimeException(); }}在run方法中进行try catch可以捕获到异常，但是特别麻烦，因为需要手动地在每个run方法中都进行try catch
UncaughtExceptionHandler
自定义UncaughtExceptionHandler
public class MyUncaughtHandler implements Thread.UncaughtExceptionHandler{ private String name; public MyUncaughtHandler(String name) { this.name = name; } @Override public void uncaughtException(Thread t, Throwable e) { Logger logger = Logger.getAnonymousLogger(); logger.log(Level.WARNING, "线程异常" + t.getName(), e); System.out.println(name + "捕获" + t.getName()+ e); }}使用自定义的类来捕获异常
public class UseOwnExceptionHandler implements Runnable { public static void main(String[] args) throws InterruptedException { Thread.setDefaultUncaughtExceptionHandler(new MyUncaughtHandler("MyHandler"));// try { new Thread(new UseOwnExceptionHandler(), "thread0").start(); Thread.sleep(300); new Thread(new UseOwnExceptionHandler(), "thread1").start(); Thread.sleep(300); new Thread(new UseOwnExceptionHandler(), "thread2").start(); Thread.sleep(300); new Thread(new UseOwnExceptionHandler(), "thread3").start(); Thread.sleep(300);// } catch (RuntimeException e) {// System.out.println("catch");// } } @Override public void run() {// try { throw new RuntimeException();// } catch (RuntimeException e) {// System.out.println("e");// } }}到此，相信大家对“Java异常处理UncaughtExceptionHandler如何使用”有了更深的了解，不妨来实际操作一番吧！这里是编程网网站，更多相关内容可以进入相关频道进行查询，关注我们，继续学习！
