多线程

public class Duoxianc1 {

public static void main(String[] args) {
RunnableDemo R1 = new RunnableDemo( "Thread-1");
R1.start();

RunnableDemo R2 = new RunnableDemo( "Thread-2");
R2.start();
}
}
class RunnableDemo implements Runnable {
private Thread t;
private String threadName;

RunnableDemo( String name) {
threadName = name;
System.out.println("Creating " + threadName );
}

public void run() {
System.out.println("Running " + threadName );
try {
for(int i = 4; i > 0; i--) {
System.out.println("Thread: " + threadName + ", " + i);
// 让线程睡眠一会
Thread.sleep(50);
}
}catch (InterruptedException e) {
System.out.println("Thread " + threadName + " interrupted.");
}
System.out.println("Thread " + threadName + " exiting.");
}

public void start () {
System.out.println("Starting " + threadName );
if (t == null) {
t = new Thread (this, threadName);
t.start ();
}
}
}

多线程

原文：http://www.cnblogs.com/wgb190/p/7157084.html