test/054-uncaught/src/Main.java

// Copyright 2006 The Android Open Source Project

/**
 * Test the uncaught exception handler.
 */
public class Main {
    public static void main(String[] args) {
        testThread(1);
        testThread(2);
        testThread(3);

        catchTheUncaught(1);
    }

    private static void testThread(int which) {
        Thread t = new Helper(which);
        t.start();

        try {
            t.join();
        } catch (InterruptedException ex) {
            ex.printStackTrace();
        }
    }

    static void catchTheUncaught(int which) {
        ThreadDeathHandler defHandler = new ThreadDeathHandler("DEFAULT");
        ThreadDeathHandler threadHandler = new ThreadDeathHandler("THREAD");

        System.out.println("Test " + which);
        switch (which) {
            case 1: {
                Thread.setDefaultUncaughtExceptionHandler(defHandler);
                break;
            }
            case 2: {
                Thread.currentThread().setUncaughtExceptionHandler(
                        threadHandler);
                break;
            }
            case 3: {
                Thread.setDefaultUncaughtExceptionHandler(defHandler);
                Thread.currentThread().setUncaughtExceptionHandler(
                        threadHandler);
                break;
            }
        }

        throw new NullPointerException("Hi diddly-ho, neighborino.");
    }

    private static class Helper extends Thread {
        private int which;

        public Helper(int which) {
            this.which = which;
        }

        public void run() {
            catchTheUncaught(which);
        }
    }
}