开启线程的方式

1、实现Runnable接口

 1 package test;
 2 
 3 
 4 
 5 public class ThreadTest implements Runnable{
 6     public void tt(){
 7         Thread t = new Thread(this);
 8         t.start();
 9     }
10 
11     @Override
12     public void run() {
13         while(true){
14         }
15     }
16     public static void main(String[] args) {
17         ThreadTest t = new ThreadTest();
18         Thread t2 = new  Thread(new Runnable() {
19             @Override
20             public void run() {
21             }
22         });
23         t2.start();
24         t.tt();
25     }
26 }

2、继承Thread类

 1 package test;
 2 
 3 public class test1 extends Thread{
 4     public void tt(){
 5         this.start();
 6     }
 7     @Override
 8     public void run() {
 9         System.out.println("sfsdfdsf");
10     }
11     public static void main(String[] args) {
12         test1 t= new test1();
13         t.tt();
14     }
15 }

3、内包格式

1 Thread t2 = new  Thread(new Runnable() {
2             @Override
3             public void run() {
4                 // TODO Auto-generated method stub
5                 
6             }
7         });
8         t2.start();

获取虚拟机中的所有线程

1 Map<Thread, StackTraceElement[]> maps=Thread.getAllStackTraces();
2         for(Thread t:maps.keySet()){
3             System.out.println(t.getName());//线程名
4             System.out.println(t.isAlive());//是否还在执行
5             
6         }