Java多线程

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Java线程是Thread类的对象，可以使用两种方式来创建多线程的Java应用程序，如下所示：

（1）实现Runnable接口

（2）继承Thread类

两种方式，都要在线程类的内部实现run()方法，然后new一个Thread，最后.start()。

1、Runnable接口的实现

package runnable;public class RunnableTest {private int length;public RunnableTest(int length) {this.length = length;}public long sum() {long ret = 0;for(int i=0;i<length; i++)ret = ret+i;return ret;}}

package runnable;public class RunnableExtend extends RunnableTest implements Runnable {public RunnableExtend(int length) {super(length);}@Overridepublic void run() {long sum = sum();System.out.println(Thread.currentThread() + " sum =" + sum);}}

package runnable;public class Main {public static void main(String[] args) {System.out.println("Thread is " + Thread.currentThread());RunnableExtend mRunnableTestThread1 = new RunnableExtend(80);Thread th1 = new Thread(mRunnableTestThread1, "th1");th1.start();RunnableExtend mRunnableTestThread2 = new RunnableExtend(140);Thread th2 = new Thread(mRunnableTestThread2, "th2");th2.start();}}

2、Thread类

package thread;public class ThreadTest extends Thread {private int length;public ThreadTest(int length) {this.length = length;}public long sum() {long ret = 0;for(int i=0;i<length; i++)ret = ret+i;return ret;}public void run() {long sum = sum();System.out.println(Thread.currentThread() + " sum =" + sum);}}

package thread;public class Main {public static void main(String[] args) {System.out.println("Thread is " + Thread.currentThread());//直接继承，创建线程ThreadTest mThreadTest1 = new ThreadTest(80);Thread th1 = new Thread(mThreadTest1, "th1");th1.start();//使用匿名类创建new Thread("th2"){int length = 190;public void run(){int ret = 0;for(int i=0;i<length; i++)ret = ret+i;System.out.println(Thread.currentThread() + " sum =" + ret);}}.start();}}

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