Java（18）：多线程的启用

日期：2017/11/10

      Java常用的多线程方法有两个：

               （1）继承Thread类+重写run方法，在mian()中用start()方法调用启动；

代码例子如下：

package com.thread;public class MyThread  extends Thread{private String name;public MyThread(String name){this.name = name;}public void run(){for (int i=10; i<1010; i++){System.out.println(name +": "+i);}//super.run();}}

package com.thread;public class ThreadTest {public static void main(String[] args) {MyThread thread = new MyThread("Thread Test One");MyThread threadtwo = new MyThread("Thread Test Two");//线程的启动不是通过run方法（调用）//thread.run();thread.start();threadtwo.start();System.out.println("**********");//another way to realize ThreadMyRunnable myrunnable1 = new MyRunnable("A");MyRunnable myrunnable2 = new MyRunnable("B");Thread t1 = new Thread(myrunnable1);Thread t2 = new Thread(myrunnable2);t1.start();t2.start();}}

               （2）实现Runnable接口+重写run方法，在mian()中新建Thread引用并使用start()方法调用启动；

代码例子：

package com.thread;class ThreadDemo implements Runnable{private String name;public ThreadDemo(String name){this.name = name;}public void run() {for (int i = 0; i<50; i++){try{Thread.sleep(1000);System.out.println(Thread.currentThread().getName()+": "+i);}catch(InterruptedException e){e.printStackTrace();}}}}public class ThreadTestThree {public static void main(String[] args) {//使用匿名对象，创建线程更加方便Thread t1 = new Thread(new ThreadDemo("A"),"A");Thread t2 = new Thread(new ThreadDemo("B"),"B");Thread t3 = new Thread(new ThreadDemo("C"),"C");//t1.setPriority(Thread.MAX_PRIORITY);t1.setPriority(Thread.MIN_PRIORITY);t2.setPriority(Thread.NORM_PRIORITY);t3.setPriority(Thread.MAX_PRIORITY);t1.start();t2.start();t3.start();}}

     PS：一般来说，使用Runnable接口实现的方法更加灵活，因为接口能够多个实现，更加易于满足业务增长的需求；但是使用继承的方法，则是不能扩展更多的功能了。