java如何获取线程id呢？

实现思路:
    使用getThreadId()方法即可获取线程Id

package com.java265.other;
public class Test16 extends Object implements Runnable {
	private ThreadID var;

	public Test16(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();
		Test16 shared = new Test16(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 = 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);
	}
	}

-----运行以上代码，将输出以下信息------
threadA: in initialValue()
threadA: var getThreadID =10001
threadB: in initialValue()
threadB: var getThreadID =10002
threadC: in initialValue()
threadC: var getThreadID =10003
threadA: var getThreadID =10001
threadB: var getThreadID =10002
threadC: var getThreadID =10003