Java 实例以下实例演示了如何使用 getThreadId() 方法获取线程id：
Main.java 文件
public class Main extends Object implements Runnable { private ThreadID var; public Main(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(); Main shared = new Main(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); }}
以上代码运行输出结果为：
threadA: in initialValue()threadA: var getThreadID =10001threadB: in initialValue()threadB: var getThreadID =10002threadC: in initialValue()threadC: var getThreadID =10003threadA: var getThreadID =10001threadB: var getThreadID =10002threadC: var getThreadID =10003