package 第十四周实验; import 第十四周实验.EX9_2.DelayRunnable; public class EX9_2 { class DelayRunnable implements Runnable { private int count = 0; private int no; private int delay; public DelayRunnable() { count++; no = count; } public void run() { try { for (int i = 0; i < 10; i++) { delay = (int) (Math.random() * 5000); Thread.sleep(delay); System.out.println("线程" + no + " 的延迟时间是 " + delay); } } catch (InterruptedException e) { } } } } class MyThread { public static void main(String args[]) { DelayRunnable runnable1 = new DelayRunnable(); DelayRunnable runnable2 = new DelayRunnable(); Thread thread1 = new Thread(runnable1); Thread thread2 = new Thread(runnable2); thread1.start(); thread2.start(); try { Thread.sleep(1000); } catch (InterruptedException e) { System.out.println("线程出错！"); } } }出现了No enclosing instance of type EX9_2 is accessible. Must qualify the allocation with an enclosing instance of type EX9_2 (e.g. x.new A() where x is an instance of EX9_2).问题，请你修改代码使其正确

将DelayRunnable类声明为静态内部类即可解决该问题。修改代码如下：

package 第十四周实验;

public class EX9_2 {
    static class DelayRunnable implements Runnable {
        private static int count = 0;
        private int no;
        private int delay;

        public DelayRunnable() {
            count++;
            no = count;
        }

        public void run() {
            try {
                for (int i = 0; i < 10; i++) {
                    delay = (int) (Math.random() * 5000);
                    Thread.sleep(delay);
                    System.out.println("线程" + no + " 的延迟时间是 " + delay);
                }
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        }
    }

    public static void main(String args[]) {
        DelayRunnable runnable1 = new DelayRunnable();
        DelayRunnable runnable2 = new DelayRunnable();
        Thread thread1 = new Thread(runnable1);
        Thread thread2 = new Thread(runnable2);
        thread1.start();
        thread2.start();
        try {
            Thread.sleep(1000);
        } catch (InterruptedException e) {
            System.out.println("线程出错！");
        }
    }
}