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多任务与多线程：多任务属于系统级的各个应用之间的关系，而多线程属于应用级的一个应用的多个功能之间的关系
创建线程的两种方式：
实现Runnable接口
class sunclass {}
class SumThread extends sumclass imlements Runnable{}
public class **{public void main(){SumThread st=new SumThread（）；Thread t=new Thread(st,"threadname");t.start();}}
继承Thread类(直接继承thread类，或者使用匿名嵌套类)
class SumThread extends Thread{ private long length; public SumThread(long length,String name){ super(name); this.length=length; } public void run(){ long temp=0; for(int i=1;i<=length;i++){ try { Thread.sleep((int)(Math.random()*10)); } catch (InterruptedException e) { // TODO Auto-generated catch block e.printStackTrace(); } temp+=i; } System.out.println(Thread.currentThread()+"zonghe:"+temp); } } public class Thread1 { public static void main(String[] args) { System.out.println("线程"); System.out.println(Thread.currentThread()); SumThread st1=new SumThread(150,"线程1"); st1.start(); new Thread("线程2"){ int length=150; public void run(){ long temp=0; for(int i=1;i<=length;i++){ try { Thread.sleep((int)(Math.random()*10)); } catch (InterruptedException e) { // TODO Auto-generated catch block e.printStackTrace(); } temp+=i; } System.out.println(Thread.currentThread()+"zonghe:"+temp); } }.start(); }}
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原文地址：http://www.cnblogs.com/zzy-frisrtblog/p/5463389.html
