Java Software Engineer Interview Question:

Explain me how can you catch an exception thrown by another thread in Java?

Submitted by: Muhammad

This can be done using Thread.UncaughtExceptionHandler.

Here's a simple example:

// create our uncaught exception handler
Thread.UncaughtExceptionHandler handler = new Thread.UncaughtExceptionHandler() {
public void uncaughtException(Thread th, Throwable ex) {
System.out.println("Uncaught exception: " + ex);
}
};

// create another thread
Thread otherThread = 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();
}
};

// set our uncaught exception handler as the one to be used when the new thread
// throws an uncaught exception
otherThread.setUncaughtExceptionHandler(handler);

// start the other thread - our uncaught exception handler will be invoked when
// the other thread throws an uncaught exception
otherThread.start();
Submitted by: Muhammad