No enclosing instance of type E is accessible. Must qualify the allocation with an enclosin的解决方案

       最近用java写一个小程序时编译出现：No enclosing instance of type E is accessible. Must qualify the allocation with an enclosing instance of type  E(e.g.  x.new A() where x is an instance of E). 原始代码如下：

public  class WorkThreadTest {class Worker {private String name; // 名字private long workDuration; // 工作持续时间/*** 构造器*/public Worker(String name, long workDuration) {this.name = name;this.workDuration = workDuration;}/*** 完成工作*/public void doWork() {System.out.println(name + " begins to work...");try {Thread.sleep(workDuration); // 用休眠模拟工作执行的时间} catch (InterruptedException ex) {ex.printStackTrace();}System.out.println(name + " has finished the job...");}}/*** 测试线程**/class WorkerTestThread implements Runnable {private Worker worker;private CountDownLatch cdLatch;public WorkerTestThread(Worker worker, CountDownLatch cdLatch) {this.worker = worker;this.cdLatch = cdLatch;}@Overridepublic void run() {worker.doWork(); // 让工人开始工作cdLatch.countDown(); // 工作完成后倒计时次数减1}}private static final int MAX_WORK_DURATION = 5000; // 最大工作时间private static final int MIN_WORK_DURATION = 1000; // 最

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