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());
     }

 }