最简单的死锁

public class Client {
	public static void main(String[] args) throws Throwable {
		List a = new ArrayList();
		List b = new ArrayList();

		new Collector("collector1", a, b).collect();
		new Collector("collector2", b, a).collect();
	}

	static class Collector {
		private String name = "";
		private Object lockA = null;
		private Object lockB = null;

		public Collector(String name, Object a, Object b) {
			this.name = name;
			this.lockA = a;
			this.lockB = b;
		}

		public void collect() {
			new Thread(new Runnable() {
				@Override
				public void run() {
					synchronized (lockA) {
						System.out.println(name + " got first...");
						try {
							Thread.currentThread().sleep(10);
						} catch (InterruptedException e) {
						}

						synchronized (lockB) {
							System.out.println(name + " got all.");
						}
					}
				}
			}, name).start();
		}
	}
}