No enclosing instance of type E is accessible. Must qualify the allocation with an enclosing

package com.thread;

public class Thread01 {
    public class Thread1 extends Thread{
        private String name;
        public Thread1(String name){
            this.name = name;
        }
        public void run() {
            for (int i = 0; i < 5; i++) {
                System.out.println(name+"运行:"+i);
                try {
                    sleep((int) Math.random()*10);
                } catch (InterruptedException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }
            }
        }

    }

    public static void main(String[] args){
        Thread1 thread02 = new Thread1("A");
        Thread1 thread02 = new Thread1("B");

    }
}

在写这段代码的时候，编译器在Thread1 thread02 = new Thread1("A");一直会报No enclosing instance of type E is accessible. Must qualify the allocation with an enclosing的错误，我在网上查了资料发现：在Java中，类中的静态方法不能直接调用动态方法。只有将某个内部类修饰为静态类，然后才能够在静态类中调用该类的成员变量与成员方法。

我们可以将将 public class Thread1 改为public static class Thread1