多线程两种实现区别-继承Thread和实现Runable

一  前面一种比较简洁。后面一种更灵活，因为java可以实现多个接口，但是只能继承一个类
二  适合于资源的共享

如果不涉及 多线程直接资源共享用Thread 比较好，否则实现Runable较好

Thread其实也是实现了Runnable接口  Thread中的start()方法的定i，可以发现此方法中使用了private native void start0()

一种是继承Thread 这种类可以直接调用运行  见：ExtendThread
ExtendThread extends Thread
ExtendThread.start()


实现Runable                  见：RunnableThread
RunnableThread et=new RunnableThread("yang");
Thread th=new Thread(et);
th.start();

ExtendThread

package thread.test;

//
public class ExtendThread extends Thread {

private String name;
public ExtendThread(String name ){
    this.name=name;
}

public static void main(String[] args) {

ExtendThread et=new ExtendThread("yang");
ExtendThread et2=new ExtendThread("ll");
        et.start();
        et2.start();
        int i=0;
        while(i++<100)
        {
            System.out.println("线程活着没"+et.isAlive());
           
        }
       
    }
    public void run(){
        for(int i = 0;i<10 ;i++){
            System.out.println("运行的线程为："+this.name);
        }
        System.out.println("我结束了哦");
    }
}

package thread.test;

public class RunnableThread implements Runnable {

private String name;

public RunnableThread(String name) {
this.name = name;
}
@Override
public void run() {
// TODO Auto-generated method stub
for (int i = 0; i < 10; i++) {
System.out.println("运行的线程为：" + this.name);
}
System.out.println("我结束了哦");
}

public static void main(String[] args) {
RunnableThread et=new RunnableThread("yang");
RunnableThread et2=new RunnableThread("ll");
//分配新的Thread对象
Thread th=new Thread(et);
Thread th2=new Thread(et2);
th.start();
th2.start();
int i = 0;
// while (i++ < 100) {
// System.out.println("线程活着没" + th.isAlive());
//
// }
}
}


资源共享的例子：
要加上synchronized 进行锁定，否则有多余数据出现

package thread.test;

//本例子用于演示如何共享
public class RunableThread2 implements Runnable {

private Integer ticket=1000;

private String name; 

    public RunableThread2(String name ){ 
        this.name=name; 
    } 


@Override
public void run() {
// TODO Auto-generated method stub
synchronized(this){
while (ticket>0) {
System.out.println("运行的线程为：" + this.name+"票："+(ticket--));
}
}
}

/**
* @param args
* @CreateDate:2014-3-3
* @author yangll
*/
public static void main(String[] args) {
// TODO Auto-generated method stub
RunableThread2 et=new RunableThread2("yang");
Thread th=new Thread(et);
Thread th2=new Thread(et);
th.start();
th2.start();
}

}