Java 实例 – 获取线程id

最后更新于：2022-03-27 01:07:11

Java 实例 – 获取线程id

Java 实例 – 获取线程id 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 =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

Java 实例 – 获取线程id Java 实例