- 实现Runnable接口，可以避免java单继承机制带来的局限；
- 实现Runnable接口，可以实现多个线程共享同一段代码(数据)；
ex：
public class ThreadTest {
/**
* @param args
*/
public static void main(String[] args) {
MyThread thread1 = new MyThread();
MyThread thread2 = new MyThread();
MyThread thread3 = new MyThread();
thread1.start();
thread2.start();
thread3.start();
MyRunnable runnable1 = new MyRunnable("r1");
new Thread(runnable1).run();
new Thread(runnable1).run();
new Thread(runnable1).run();
}
}
class MyThread extends Thread
{
int things = 5;
@Override
public void run() {
while(things > 0)
{
System.out.println(currentThread().getName() + " things:" + things);
things--;
}
}
}
class MyRunnable implements Runnable
{
String name;
public MyRunnable(String name)
{
this.name = name;
}
int things = 5;
@Override
public void run() {
while(things > 0)
{
things--;
System.out.println(name + " things:" + things);
}
}
}
运行结果：
Thread-2 things:5
r1 things:4
r1 things:3
Thread-1 things:5
Thread-1 things:4
Thread-1 things:3
r1 things:2
Thread-2 things:4
Thread-2 things:3
Thread-2 things:2
Thread-2 things:1
r1 things:1
Thread-1 things:2
r1 things:0
Thread-1 things:1
Thread-0 things:5
Thread-0 things:4
Thread-0 things:3
Thread-0 things:2
Thread-0 things:1
注解：多个Thread可以同时加载一个Runnable，当各自Thread获得CPU时间片的时候开始运行runnable，runnable里面的资源是被共享的。
- 线程池只能放入实现Runable或Callable类线程，不能直接放入继承Thread的类。
