Java多线程开发二

 

 创建线程

Java中创建线程又两种方式，一种是继承Thread类，一种是实现Runnable接口。对于Thread的继承类，直接new即可，对于Runnable的实现类，用这个接口的实现类来new一个线程。

代码示例如下：

//继承Thread类

public class FirstThread extends Thread {

 

       //需要继承run方法

       public void run() {

              try {

                     for (int i = 0; i < 20; i++) {

                            sleep(500);

                            System.out.println(getName());

                     }

              } catch (InterruptedException e) {

                     // 处理线程被终止的情况

                     e.printStackTrace();

              }

 

       }

}

 

//实现Runnable接口

public class SecondThread implements Runnable {

       //Runnable接口只有一个run方法，必须实现。

       public void run() {       

              try {

                     for (int i = 0; i < 20; i++) {

                            Thread.sleep(400);

                            System.out.println(Thread.currentThread().getName());

                     }

              } catch (InterruptedException e) {

                     //处理线程被终止的情况

                     e.printStackTrace();

              }

       }

 

}

 

//执行线程

              FirstThread t1 = new FirstThread();

              t1.setName("thread1");

              FirstThread t2 = new FirstThread();

              t2.setName("thread2");

              SecondThread r1 = new SecondThread();

              Thread t3 = new Thread(r1);

              Thread t4 = new Thread(r1);

              t3.setName("thread3");

              t4.setName("thread4");

             

              t1.start();

              t2.start();

              t3.start();

              t4.start();

需要注意，线程的执行必须使用start方法。