simplethreads.java

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public class SimpleThreads {

    //Display a message, preceded by the name of the current thread
    static void threadMessage(String message) {
        String threadName = Thread.currentThread().getName();
        System.out.format("%s: %s%n", threadName, message);
    }
    //注意这是一个内部类
    private static class MessageLoop implements Runnable {
        public void run() {
            String importantInfo[] = {
                "Mares eat oats",
                "Does eat oats",
                "Little lambs eat ivy",
                "A kid will eat ivy too"
            };
            try {
                for (String info : importantInfo) {
                    //Pause for 4 seconds
                    Thread.sleep(4000);
                    //Print a message
                    threadMessage(info);
                }
            } catch (InterruptedException e) {
                threadMessage("I wasn't done!");
            }
        }
    }

    public static void main(String args[]) throws InterruptedException {

        //Delay, in milliseconds before we interrupt MessageLoop
        //thread (default one hour).
        long patience = 1000 * 60 * 60;

        threadMessage("Starting MessageLoop thread");
        long startTime = System.currentTimeMillis();
        Thread t = new Thread(new MessageLoop());
        t.start();

        threadMessage("Waiting for MessageLoop thread to finish");
        //loop until MessageLoop thread exits
        while (t.isAlive()) {
            threadMessage("Still waiting...");
            //Wait maximum of 1 second for MessageLoop thread to finish.
            t.join(1000);
            if (((System.currentTimeMillis() - startTime) > patience) &&
                    t.isAlive()) {
                threadMessage("Tired of waiting!");
                t.interrupt();
            }

        }
        threadMessage("Finally!");
    }
}


思考：
1.程序的运行情况
2.如果等待时间patience设置为10程序运行有无变化？
3.结果是否符合你的预期？原因？