Thread--currentThread()

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

 1 package thread.demo01;
 2 
 3 public class MyThread extends Thread {
 4 
 5     public MyThread() {
 6         System.out.println("构造方法的打印 : " + Thread.currentThread().getName());
 7     }
 8     
 9     @Override
10     public void run() {
11         System.out.println("run方法的打印: " + Thread.currentThread().getName());
12     }
13 }

 1 package thread.demo01;
 2 
 3 public class Run2 {
 4 
 5     public static void main(String[] args) {
 6         MyThread myThread = new MyThread();
 7         myThread.start();
 8     }
 9     
10 }

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：

 1 package thread.demo01;
 2 
 3 public class Run2 {
 4 
 5     public static void main(String[] args) {
 6         MyThread myThread = new MyThread();
 7 //        myThread.start();
 8         myThread.run();
 9     }
10     
11 }

若更改代码为如上，run方法则是main线程调用，所以输出结果：

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

 1 package thread.demo01;
 2 
 3 public class CurrentOperate extends Thread {
 4 
 5     public CurrentOperate() {
 6         System.out.println("CountOperate -- begin");
 7         System.out.println("Thread.currentThread().getName() = " + Thread.currentThread().getName());
 8         System.out.println("this.getName() = " + this.getName());
 9         System.out.println("CountOperate -- end");
10     }
11     
12     @Override
13     public void run() {
14         System.out.println("run -- begin");
15         System.out.println("Thread.currentThread().getName() = " + Thread.currentThread().getName());
16         System.out.println("this.getName() = " + this.getName());
17         System.out.println("run -- end");
18     }
19     
20 }

 1 package thread.demo01;
 2 
 3 public class Run {
 4     
 5     public static void main(String[] args) {
 6         CurrentOperate c = new CurrentOperate();
 7         Thread c1 = new Thread(c);
 8         c1.start();
 9     }
10 
11 }

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。

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

 1 package thread.demo02;
 2 
 3 public class CountOperate extends Thread {
 4     
 5     public CountOperate() {
 6         System.out.println("CountOpreate -- begin");
 7         System.out.println("Thread.currentThread().getName() = " + Thread.currentThread().getName());
 8         System.out.println("Thread.currentThread().isAlive() = " + Thread.currentThread().isAlive());
 9         System.out.println("this.getName() = " + this.getName());
10         System.out.println("this.isAlive() = " + this.isAlive());
11         System.out.println("CountOpreate -- end");
12     }
13     
14     @Override
15     public void run() {
16         System.out.println("run -- begin");
17         System.out.println("Thread.currentThread().getName() = " + Thread.currentThread().getName());
18         System.out.println("Thread.currentThread().isAlive() = " + Thread.currentThread().isAlive());
19         System.out.println("this.getName() = " + this.getName());
20         System.out.println("this.isAlive() = " + this.isAlive());
21         System.out.println("run -- end");
22     }
23 
24 }

 1 package thread.demo02;
 2 
 3 public class Run {
 4     
 5     public static void main(String[] args) {
 6         CountOperate c = new CountOperate();
 7         Thread t1 = new Thread(c);
 8         System.out.println("main begin t1 isAlive = " + t1.isAlive());
 9 //        t1.setName("A");
10         t1.start();
11         System.out.println("main end t1 isAlive = " + t1.isAlive());
12     }
13 
14 }