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Copy pathCaptureUncaughtException.java
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executable file
·59 lines (51 loc) · 2.01 KB
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package com.brianway.learning.java.concurrent;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.ThreadFactory;
/**
* TODO 为什么有两个线程?
*/
public class CaptureUncaughtException {
public static void main(String[] args) {
ExecutorService exec = Executors.newCachedThreadPool(
new HandlerThreadFactory());
exec.execute(new ExceptionThread());
}
}
class ExceptionThread implements Runnable {
public void run() {
Thread t = Thread.currentThread();
System.out.println("run() by " + t);
System.out.println(
"eh = " + t.getUncaughtExceptionHandler());
throw new RuntimeException();
}
}
class MyUncaughtExceptionHandler implements Thread.UncaughtExceptionHandler {
public void uncaughtException(Thread t, Throwable e) {
System.out.println("caught " + e + " in " + t);
}
}
class HandlerThreadFactory implements ThreadFactory {
public Thread newThread(Runnable r) {
System.out.println(this + " creating new Thread");
Thread t = new Thread(r);
System.out.println("created " + t);
t.setUncaughtExceptionHandler(
new MyUncaughtExceptionHandler());
System.out.println(
"eh = " + t.getUncaughtExceptionHandler());
return t;
}
}
/* Output: (90% match)
com.brianway.learning.java.concurrent.HandlerThreadFactory@266474c2 creating new Thread
created Thread[Thread-0,5,main]
eh = com.brianway.learning.java.concurrent.MyUncaughtExceptionHandler@6f94fa3e
run() by Thread[Thread-0,5,main]
eh = com.brianway.learning.java.concurrent.MyUncaughtExceptionHandler@6f94fa3e
com.brianway.learning.java.concurrent.HandlerThreadFactory@266474c2 creating new Thread
created Thread[Thread-1,5,main]
eh = com.brianway.learning.java.concurrent.MyUncaughtExceptionHandler@3ff961b5
caught java.lang.RuntimeException in Thread[Thread-0,5,main]
*///:~