创建线程的方法一:继承Thread类

class Lefthand extends Thread {
public void run() {
for(int i=0;i<=5;i++) {
System.out.println("You are Students!");
try{
sleep(500);
}catch(InterruptedException e){}
}
}
}
class Righthand extends Thread {
public void run() {
for(int i=0;i<=5;i++) {
System.out.println("I am a Teacher!");
}try{
sleep(300);
}catch(InterruptedException e) {}
}
}
public class ThreadTest {
static Lefthand left;
static Righthand right;
public static void main(String args[]) {
left=new Lefthand();
right=new Righthand();
left.start();
right.start();
}
}