初入java多线程，小白奋兴当自强，求大佬帮我看看问题

Question

public class xiancheng {

public static void main(String[] args){
    tortoise tod  = new tortoise();
    Thread spraktortoise = new Thread(tod);
    rabbit ra = new rabbit();
    Thread sprakrabbit = new Thread(ra);
    spraktortoise.start();
    sprakrabbit.start();
}

class tortoise implements Runnable{
    public void run(){
        for(int i=0;i<=300;i=i+30)
            System.out.println("乌龟已到："+i);
    }

}
class rabbit implements Runnable{

    public void run(){
        for(int i=0;i<=300;i=i+100)
            System.out.println("兔子已到："+i);
    }

}
}

Answer 1

把tortoise这个类放在xiancheng类外面。内部类在静态函数里不能直接初始化。