JAVA系列： 线程异常处理（线程内、线程组）

​目录​

线程捕捉

 demo

 其他方法

只捕捉线程组异常

线程捕捉

有两种方法：一种捕捉指定的线程，一种是捕捉所有的线程

​捕捉所有的线程​

​捕捉指定的线程​

 demo

m1

m2

Exception in thread "m2" java.lang.NullPointerException

at MyThread.run(Test.java:9)

线程：m1出现了异常

m1、m2都异常，只捕获m1

m1

m2

线程：m1出现了异常

线程：m2出现了异常

 其他方法

​使用Executors创建线程时，还可以在ThreadFactory中设置​

ExecutorService exec = Executors.newCachedThreadPool(new ThreadFactory(){

    @Override

    public Thread newThread(Runnable r) {

        Thread thread = new Thread(r);

        thread.setUncaughtExceptionHandler(new MyUnchecckedExceptionhandler());

        return thread;

    }

});

​利用线程池提交线程时返回的Feature引用​

Future<Integer> future = executorService.submit(callable);

try {

    Integer result = future.get();

} catch (InterruptedException e) {

    e.printStackTrace();

} catch (ExecutionException e) {

    //4.处理捕获的线程异常

}

只捕捉线程组异常

public class Test
{
public static void main(String[] args) {

    //线程组
    MyGroup group = new MyGroup("My组");

    MyThread m = new MyThread(group,"线程m");

    //对象
    // m.setUncaughtExceptionHandler(new ObjectUncaughtExceptionHandler()) ;

    //类
    // MyThread.setDefaultUncaughtExceptionHandler(new StateUncaughtExceptionHandler()) ;
    m.start() ;
}
}



Exception in thread "线程m" java.lang.NumberFormatException: For input string: "a"
at java.lang.NumberFormatException.forInputString(Unknown Source)
at java.lang.Integer.parseInt(Unknown Source)
at java.lang.Integer.parseInt(Unknown Source)
at com.qin.test2.MyThread.run(Test.java:43)
java.lang.NumberFormatException: For input string: "a"
 线程组的异常处理
at java.lang.NumberFormatException.forInputString(Unknown Source)
at java.lang.Integer.parseInt(Unknown Source)
at java.lang.Integer.parseInt(Unknown Source)
at com.qin.test2.MyThread.run(Test.java:43)