多线程编程

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Class:Thread

interface:Runnerable

实现Runnerable接口比继承Thread类所具有的优势：

1）适合多个相同的程序代码的线程去处理同一个资源

2）可以避免JAVA中单继承的限制

3）增加程序的健壮性，代码可以被多个线程共享，代码和数据独立

所以，推荐实现接口

主程序：

<span style="font-size:24px;">import java.util.*;import java.lang.*;public class Generaldemo{public static void main(String[] args){myThread mthread = new myThread();mythread2 th2 = new mythread2();Thread r = new Thread(th2);mthread.start();//启动一个进程r.start();//启动另一个进程for(int i=0;i<10000;i++){System.out.println(Thread.currentThread().getName()+":"+i);try{Thread.sleep(5);}catch(InterruptedException e){e.printStackTrace();}}}}</span>

线程1：

<span style="font-size:24px;">public class myThread extends Thread{public void run() {for(int i=0;i<10000;i++){System.out.println(Thread.currentThread().getName()+":"+i);try{Thread.sleep(5);}catch(InterruptedException e){e.printStackTrace();}}}}</span>

线程2：

<span style="font-size:24px;">import java.lang.*;public class mythread2 implements Runnable{public void run(){for(int i=0;i<10000;i++){System.out.println(Thread.currentThread().getName()+":"+i);try{Thread.sleep(5);}catch(InterruptedException e){e.printStackTrace();}}}}</span>

多线程的优先级设定：

package threaddemo;class ThRun implements Runnable{public void run(){for(int i=0;i<5;i++){try {Thread.sleep(1000);System.out.println(Thread.currentThread().getName()+":"+i);} catch (InterruptedException e) {// TODO Auto-generated catch blocke.printStackTrace();}  //sleep->1s}}}public class mythread4 {public static void main(String[] args) {Thread t1 = new Thread(new ThRun(),"A");Thread t2 = new Thread(new ThRun(),"B");Thread t3 = new Thread(new ThRun(),"C");t1.setPriority(Thread.MIN_PRIORITY);t2.setPriority(Thread.NORM_PRIORITY);t3.setPriority(Thread.MAX_PRIORITY);t1.start();t2.start();t3.start();}}

输出结果：

<img src="http://img.blog.csdn.net/20140919162841444?watermark/2/text/aHR0cDovL2Jsb2cuY3Nkbi5uZXQvTWFya19fWmVuZw==/font/5a6L5L2T/fontsize/400/fill/I0JBQkFCMA==/dissolve/70/gravity/SouthEast" alt="" />

可以明显的看出C线程的优先级要高于B，B要高于A

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