先看代码

public class TwoThread extends Thread{
    private Thread creatorThread;
    public TwoThread(){
        //对调用本方法的线程进行记录
        creatorThread = Thread.currentThread();
    }
    public void run(){
        for(int i=0; i<10; i++){
            System.out.println("run");
            printMsg();
        }
    }
    public void printMsg(){
        //对运行这一方法线程的引用
        Thread t = Thread.currentThread();
        if(t == creatorThread){
            System.out.println("Creator Thread -- " + t.getName());
        }else if(t == this){
            System.out.println("New Thread -- " + t.getName());
        }else{
            System.out.println("Mystery Thread -- " + t.getName());
        }
    }
    public static void main(String[] args){
        TwoThread tt = new TwoThread();//调用构造方法，哪个线程调用？因为tt是由main线程创建所以由main线程调用构造方法？
        tt.start();
        for(int i=0; i<10; i++){
            System.out.println("main");
            tt.printMsg();//main线程调用
        }
    }
}

本程序先由main线程对tt线程进行创建，对tt线程进行创建的过程中由main线程调用其构造方法，则creatorThread是对main线程的引用。第29行对tt.printMsg()也是由main线程进行调用，与tt对象无关。

则打印结果为

main
Creator Thread -- main
main
Creator Thread -- main
main
Creator Thread -- main
main
Creator Thread -- main
main
Creator Thread -- main
main
Creator Thread -- main
main
Creator Thread -- main
main
Creator Thread -- main
main
Creator Thread -- main
main
Creator Thread -- main
run
New Thread -- Thread-0
run
New Thread -- Thread-0
run
New Thread -- Thread-0
run
New Thread -- Thread-0
run
New Thread -- Thread-0
run
New Thread -- Thread-0
run
New Thread -- Thread-0
run
New Thread -- Thread-0
run
New Thread -- Thread-0
run
New Thread -- Thread-0

本文出自 “混混” 博客，请务必保留此出处http://yimaoqian.blog.51cto.com/1328422/1393081

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方法与其执行该方法的线程