ジャワの新しい旅行記の12----スレッドの創建の2種類の形式

public class Thread1 extends Thread{
    public void run(){
        int i=0;
        while(i<10){
            i++;
            System.out.println(i);
        }
    }
    
    public static void main(String[] args){
        Thread1 t=new Thread1();
        t.start();
    }
}

public class Thread2 implements Runnable{

    @Override
    public void run() {
        int i=10;
        while(i>0){
            i--;
            System.out.println(i);
        }
    }
    
    public static void main(String[] args){
        Thread2 t=new Thread2();
        new Thread(t).start();
    }
}