Java 实例 - 获取线程id

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 =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