Java Get Thread ID Example

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public class JavaThreadIDExample extends Object implements Runnable {

	private ThreadID var;

	public JavaThreadIDExample(ThreadID v) {
		this.var = v;
	}

	public void run() {
		try {
			print("var getThreadID =" + var.getThreadID());
			Thread.sleep(2000);
			print("var getThreadID =" + var.getThreadID());
		} catch (InterruptedException x) {
		}
	}

	private static void print(String msg) {
		String name = Thread.currentThread().getName();
		System.out.println(name + ": " + msg);
	}

	public static void main(String[] args) {
		ThreadID tid = new ThreadID();
		JavaThreadIDExample shared = new JavaThreadIDExample(tid);

		try {
			Thread threadA = new Thread(shared, "threadA");
			threadA.start();

			Thread.sleep(500);

			Thread threadB = new Thread(shared, "threadB");
			threadB.start();

			Thread.sleep(500);

			Thread threadC = new Thread(shared, "threadC");
			threadC.start();
		} catch (InterruptedException x) {
		}
	}
}

class ThreadID extends ThreadLocal {
	private int nextID;

	public ThreadID() {
		nextID = 10001;
	}

	private synchronized Integer getNewID() {
		Integer id = new Integer(nextID);
		nextID++;
		return id;
	}

	protected Object initialValue() {
		print("in initialValue()");
		return getNewID();
	}

	public int getThreadID() {
		Integer id = (Integer) get();
		return id.intValue();
	}

	private static void print(String msg) {
		String name = Thread.currentThread().getName();
		System.out.println(name + ": " + msg);
	}
}
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