java-多线程1

一、创建多线程的方式1--继承Thread类

步骤：1自定义类MyThread继承Thread类 2MyThread里面重写run()方法 3创建对象 4启动线程

 1 package test; 2  3 public class MyThread extends Thread{ 4     @Override 5     public void run() { 6         // TODO Auto-generated method stub 7         //super.run(); 8         for(int i=0;i<100;i++){ 9             System.out.PRintln(getName()+": "+i );10         }11     }12 }

 1 package test; 2  3 public class Test01 { 4     public static void main(String[] args) { 5         MyThread mt=new MyThread(); 6         mt.start(); 7         MyThread mt2=new MyThread(); 8         mt2.start(); 9         10     }11 }

二、线程基础

1获得线程名称

1 getName()

2设置线程名称

my1.setName("线程1");

3返回当前正在执行的线程的名称

Thread.currentThread().getName();

4线程优先级

1-10，默认是5

获得优先级

my1.getPriority()

设置优先级

my1.setPriority(2);

三、线程控制

1线程睡眠

 1 package test; 2  3 public class Test01 { 4     public static void main(String[] args) { 5         MyThread mt=new MyThread();     6         MyThread mt2=new MyThread(); 7         MyThread mt3=new MyThread(); 8          9         mt.setName("进程1");10         mt2.setName("进程2");11         mt3.setName("进程3");12         13         mt.start();14         mt2.start();15         mt3.start();16     }17 }

 1 package test; 2 import java.util.Date; 3 public class MyThread extends Thread{ 4     @Override 5     public void run() { 6         // TODO Auto-generated method stub 7         //super.run(); 8         for(int i=0;i<100;i++){ 9             System.out.println(getName()+": "+i +"  " +new Date());10             //睡眠11             try {12                 Thread.sleep(1000);13             } catch (InterruptedException e) {14                 // TODO Auto-generated catch block15                 e.printStackTrace();16             }17         }18     }19 }

2线程加入

 1 package test; 2  3 public class Test01 { 4     public static void main(String[] args) { 5         MyThread mt=new MyThread();     6         MyThread mt2=new MyThread(); 7         MyThread mt3=new MyThread(); 8          9         mt.setName("进程1");10         mt2.setName("进程2");11         mt3.setName("进程3");12         13         mt.start();14         //线程加入    该线程执行完毕，其他线程才能执行15         try {16             mt.join();17         } catch (InterruptedException e) {18             // TODO Auto-generated catch block19             e.printStackTrace();20         }21         mt2.start();22         mt3.start();23     }24 }

 1 package test; 2 import java.util.Date; 3 public class MyThread extends Thread{ 4     @Override 5     public void run() { 6         // TODO Auto-generated method stub 7         //super.run(); 8         for(int i=0;i<100;i++){ 9             System.out.println(getName()+": "+i +"  " +new Date());10             //睡眠11             try {12                 Thread.sleep(100);13             } catch (InterruptedException e) {14                 // TODO Auto-generated catch block15                 e.printStackTrace();16             }17         }18     }19 }

3线程礼让

 1 package test; 2  3 public class Test01 { 4     public static void main(String[] args) { 5         MyThread mt=new MyThread();     6         MyThread mt2=new MyThread(); 7         MyThread mt3=new MyThread(); 8          9         mt.setName("进程1");10         mt2.setName("进程2");11             12         mt.start();        13         mt2.start();14 15     }16 }

 1 package test; 2 import java.util.Date; 3 public class MyThread extends Thread{ 4     @Override 5     public void run() { 6         // TODO Auto-generated method stub 7         //super.run(); 8         for(int i=0;i<100;i++){ 9             System.out.println(getName()+": "+i +"  " +new Date());10             //线程礼让11             Thread.yield();12         }13     }14 }

4守护线程 主线程挂了，守护线程都会挂掉

 1 package test; 2  3 import java.util.Date; 4  5 public class MyThread extends Thread { 6     @Override 7     public void run() { 8         // TODO Auto-generated method stub 9         // super.run();10         for (int i = 0; i < 20; i++) {11             System.out.println(getName() + ": " + i + "  " + new Date());12 13         }14     }15 }

 1 package test; 2  3 public class Test01 { 4     public static void main(String[] args) { 5         MyThread mt=new MyThread();     6         MyThread mt2=new MyThread(); 7         MyThread mt3=new MyThread(); 8          9         mt.setName("进程1");10         mt2.setName("进程2");11         12         //设置守护线程13         mt.setDaemon(true);14         mt2.setDaemon(true);15         16         mt.start();        17         mt2.start();18         19         //改主线程的名字为“刘备”20         Thread.currentThread().setName("刘备");21         for(int x=0;x<5;x++){22             System.out.println(Thread.currentThread().getName()+": "+x);23         }24 25     }26 }

5进程中断

 1 package test; 2  3 public class Test01 { 4     public static void main(String[] args) { 5         MyThread mt = new MyThread(); 6  7         mt.start(); 8         //进程中断 9         //超过3秒不醒，则中断10         try {11             Thread.sleep(3000);12             mt.interrupt();13         } catch (InterruptedException e) {14             // TODO Auto-generated catch block15             e.printStackTrace();16         }17 18     }19 }

 1 package test; 2  3 import java.util.Date; 4  5 public class MyThread extends Thread { 6     @Override 7     public void run() { 8         System.out.println("开始执行："+new Date()); 9         try {10             Thread.sleep(10000);11         } catch (InterruptedException e) {12             // TODO Auto-generated catch block13             //e.printStackTrace();14             System.out.println("线程被终止了");15         }16         System.out.println("结束执行："+new Date());17     }18 }