Java多线程实现......(1,继承Thread类)

public class MyThread extends Thread{
private int startPrint,printCount;
private String threadName;

public MyThread(int startPrint ,int printCount ,String threadName){
this.startPrint = startPrint;
this.printCount = printCount;
this.threadName = threadName;
}
public void run(){
for(int i=0 ;i<printCount ;i++){
System.out.println(threadName + ":" + (i + startPrint));
}
}
}

public class MainThread{
public static void main(String[] args){
MyThread mt1 = new MyThread(1   ,100 ,"Thread 1 ");
MyThread mt2 = new MyThread(100 ,120 ,"Thread 2 ");

mt1.start();
mt2.start();
}
}