Thread--currentThread()

参考：http://bbs.csdn.net/topics/391872079

package thread.demo01;

public class MyThread extends Thread {

    public MyThread() {
        System.out.println("构造方法的打印 : " + Thread.currentThread().getName());
    }
    
    @Override
    public void run() {
        System.out.println("run方法的打印: " + Thread.currentThread().getName());
    }
}

package thread.demo01;

public class Run2 {

    public static void main(String[] args) {
        MyThread myThread = new MyThread();
        myThread.start();
    }
    
}

MyThread的构造方法是main现成调用的

而run方法是被新开的线程调用

所以输出结果是：

package thread.demo01;

public class Run2 {

    public static void main(String[] args) {
        MyThread myThread = new MyThread();
//        myThread.start();
        myThread.run();
    }
    
}

若更改代码为如上，run方法则是main线程调用，所以输出结果：

----------------------------------------------------------------------------------

package thread.demo01;

public class CurrentOperate extends Thread {

    public CurrentOperate() {
        System.out.println("CountOperate -- begin");
        System.out.println("Thread.currentThread().getName() = " + Thread.currentThread().getName());
        System.out.println("this.getName() = " + this.getName());
        System.out.println("CountOperate -- end");
    }
    
    @Override
    public void run() {
        System.out.println("run -- begin");
        System.out.println("Thread.currentThread().getName() = " + Thread.currentThread().getName());
        System.out.println("this.getName() = " + this.getName());
        System.out.println("run -- end");
    }
    
}

package thread.demo01;

public class Run {
    
    public static void main(String[] args) {
        CurrentOperate c = new CurrentOperate();
        Thread c1 = new Thread(c);
        c1.start();
    }

}

和上面一样，这边的有个 Thread-1，是因为 CurrentOperate 传给了 Thread，所以

调用run方法 不是main而是c1所在的线程。

Thread.currentThread().getName()是获得调用这个方法的线程的名字，在main线程中调用的当然是main了。

而this.getName()这个方法是获取当前对象的名字，只是单纯的方法的调用。

----------------------------------------------------------------------------------------------

package thread.demo02;

public class CountOperate extends Thread {
    
    public CountOperate() {
        System.out.println("CountOpreate -- begin");
        System.out.println("Thread.currentThread().getName() = " + Thread.currentThread().getName());
        System.out.println("Thread.currentThread().isAlive() = " + Thread.currentThread().isAlive());
        System.out.println("this.getName() = " + this.getName());
        System.out.println("this.isAlive() = " + this.isAlive());
        System.out.println("CountOpreate -- end");
    }
    
    @Override
    public void run() {
        System.out.println("run -- begin");
        System.out.println("Thread.currentThread().getName() = " + Thread.currentThread().getName());
        System.out.println("Thread.currentThread().isAlive() = " + Thread.currentThread().isAlive());
        System.out.println("this.getName() = " + this.getName());
        System.out.println("this.isAlive() = " + this.isAlive());
        System.out.println("run -- end");
    }

}

package thread.demo02;

public class Run {
    
    public static void main(String[] args) {
        CountOperate c = new CountOperate();
        Thread t1 = new Thread(c);
        System.out.println("main begin t1 isAlive = " + t1.isAlive());
//        t1.setName("A");
        t1.start();
        System.out.println("main end t1 isAlive = " + t1.isAlive());
    }

}