Java如何从线程中捕获异常
我有Java主类,在该类中,我启动了一个新线程,在主类中,它等待线程死亡。在某个时刻,我从线程中抛出了运行时异常,但是我无法在主类中捕获从线程中抛出的异常。
这是代码:
public class Test extends Thread{
public static void main(String[] args) throws InterruptedException
{
Test t = new Test();
try
{
t.start();
t.join();
}
catch(RuntimeException e)
{
System.out.println("** RuntimeException from main");
}
System.out.println("Main stoped");
}
@Override
public void run()
{
try
{
while(true)
{
System.out.println("** Started");
sleep(2000);
throw new RuntimeException("exception from thread");
}
}
catch (RuntimeException e)
{
System.out.println("** RuntimeException from thread");
throw e;
}
catch (InterruptedException e)
{
}
}
}
有人知道为什么吗?
回答:
使用Thread.UncaughtExceptionHandler
。
Thread.UncaughtExceptionHandler h = new Thread.UncaughtExceptionHandler() { public void uncaughtException(Thread th, Throwable ex) {
System.out.println("Uncaught exception: " + ex);
}
};
Thread t = new Thread() {
public void run() {
System.out.println("Sleeping ...");
try {
Thread.sleep(1000);
} catch (InterruptedException e) {
System.out.println("Interrupted.");
}
System.out.println("Throwing exception ...");
throw new RuntimeException();
}
};
t.setUncaughtExceptionHandler(h);
t.start();
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