Java多线程

Java 线程基础

一 两种创建线程的基本方式

public class MyThread extends Thread {

   private String name;

   public MyThread(String name) {

      this.name = name;

   }

   @Override

   public void run() {

      for(int i = 0; i < 10; i++) {

         System.out.println(name + "" + i);

      }

   }

}

 

public class MyThread1implements Runnable {

   private String name;

   public MyThread1(String name) {

      this.name = name;

   }

   @Override

   public void run() {

      for(int i = 0; i < 10; i++) {

         System.out.println(name + "" + i);

      }

   }

}

public classThreadTest {

   public static voidmain(String[] args) {

      /*MyThread myThread = newMyThread("A");

      MyThread myThread2 = newMyThread("B");

      myThread.start();

      myThread2.start();*/

      MyThread1 myThread3 = newMyThread1("C");

      MyThread1 myThread4 = newMyThread1("D");

      Thread t1 = new Thread(myThread3);

      Thread t2 = new Thread(myThread4);

      t1.start();

      t2.start();

   }

}

二 线程的状态

三 线程中常用的方法

public classRunnableDemo implements Runnable {

    private String name;

    publicRunnableDemo(String name) {

      this.name = name;

   }

   @Override

   public void run() {

      for(int i = 0; i < 500;i++) {

         System.out.println(name + "" + Thread.currentThread().getName() + "" + i);

      }

   }

  

}

public class DemoTest{

   public static voidmain(String[] args) {

      RunnableDemo rd = newRunnableDemo("A");

      RunnableDemo rd1 = newRunnableDemo("B");

      Thread thread = new Thread(rd);

      //Thread thread1 = new Thread(rd1);

      thread.start();

      for(int i = 0; i < 500;i++) {

         if(i == 10) {

            try {

                thread.join();

            } catch(InterruptedException e) {

                // TODOAuto-generated catch block

                e.printStackTrace();

            }

         }

         System.out.println("main" + "" + i);

      }

      System.out.println(thread.isAlive());

      //System.out.println(thread.isAlive());

      /*thread1.start();*/

   }

}

 

public classRunnableDemo implements Runnable {

    private String name;

    publicRunnableDemo(String name) {

      this.name = name;

   }

   @Override

   public void run() {

      for(int i = 0; i < 10; i++) {

         try {

            Thread.sleep(1000);

         } catch(InterruptedException e) {

            // TODOAuto-generated catch block

            e.printStackTrace();

         }

         System.out.println(name + "" + Thread.currentThread().getName() + "" + i);

      }

   }

  

}

四 同步代码块

public classMyThreadDemo implements Runnable {

   private int ticket = 5;

   //资源共享的时候需要用到同步

   @Override

   public void run() {

      for(int i = 0; i < 10; i++) {

         synchronized (this) {

            if(ticket > 0) {

                try {

                   Thread.sleep(1000);

                } catch(InterruptedException e) {

                   e.printStackTrace();

                }

                System.out.println("车票：" + ticket--);

            }

         }

      }

   }

   //public synchronized voidbuyTicket(){}//同步方法

}

public classMyThreadDemoTest {

   public static voidmain(String[] args) {

      MyThreadDemo m = newMyThreadDemo();

      Thread t = new Thread(m);

      Thread t1 = new Thread(m);

      Thread t2 = new Thread(m);

      t.start();

      t1.start();

      t2.start();

   }

}

五 线程的生命周期