Question

Sharedresource类

    class Sharedresource {
        private int contents;
        private boolean available = false;

        public synchronized int get() {
            while (available == false) {
                // System.out.println("sharedresorce,while(false)");
                try {
                    // /System.out.println("sharedresorce,while(false)object block");
                    wait();
                    // System.out.println("sharedresorce,while(false)object relise");
                } catch (Exception e) {
                    // System.out.println("Thread Interrupted");
                }
            }
            available = false;
            notify();
            return contents;
        }

        public synchronized void set(int value) {
            while (available == true) {
                try {
                    wait();
                } catch (Exception e) {
                    System.out.println("Thread Interrupted");
                }
            }
            contents = value;
            available = true;
            notify();
        }
    }

制作人类

    class Produser extends Thread {
        private Sharedresource resource;
        private int number;

        Produser(Sharedresource s, int number) {
            resource = s;
            this.number = number;
        }

        @Override
        public void run() {
            for (int i = 1; i <= 10; i++) {
                resource.set(i);
                System.out.println("produser#" + this.number + "set:" + i);
                // try{
                // sleep(2000);
                // }
                // catch (Exception e) {
                // System.out.println("tread intrupted");
                // }
            }
        }
    }

消费者阶层

    class Consumer extends Thread {
        private Sharedresource resource;
        private int number;

        public Consumer(Sharedresource s, int number) {
            resource = s;
            this.number = number;
        }

        int value = 0;

        @Override
        public void run() {
            for (int i = 1; i <= 10; i++) {
                value = resource.get();
                System.out.println("Consumer#" + this.number + "getvalue:" + value);

            }
        }
    }

MAIN CLASS

    public class SynchronizatonDemo121 {

        public static void main(String[] args) {
            Sharedresource r = new Sharedresource();
            Produser p = new Produser(r, 1);
            Consumer c = new Consumer(r, 1);
            p.start();
            c.start();

        }

    }

输出-1

Consumer#1getvalue:1
produser#1set:1
produser#1set:2
Consumer#1getvalue:2
produser#1set:3
Consumer#1getvalue:3
produser#1set:4
Consumer#1getvalue:4
produser#1set:5
Consumer#1getvalue:5
produser#1set:6
Consumer#1getvalue:6
Consumer#1getvalue:7
produser#1set:7
produser#1set:8
produser#1set:9
Consumer#1getvalue:8
Consumer#1getvalue:9
produser#1set:10
Consumer#1getvalue:10

输出-2

produser#1set:1
produser#1set:2
Consumer#1getvalue:1
Consumer#1getvalue:2
produser#1set:3
Consumer#1getvalue:3
produser#1set:4
Consumer#1getvalue:4
produser#1set:5
Consumer#1getvalue:5
produser#1set:6
Consumer#1getvalue:6
produser#1set:7
Consumer#1getvalue:7
produser#1set:8
Consumer#1getvalue:8
produser#1set:9
Consumer#1getvalue:9
produser#1set:10
Consumer#1getvalue:10

输出-3

produser#1set:1
Consumer#1getvalue:1
Consumer#1getvalue:2
produser#1set:2
produser#1set:3
Consumer#1getvalue:3
produser#1set:4
Consumer#1getvalue:4
produser#1set:5
Consumer#1getvalue:5
produser#1set:6
Consumer#1getvalue:6
Consumer#1getvalue:7
produser#1set:7
produser#1set:8
Consumer#1getvalue:8
Consumer#1getvalue:9
produser#1set:9
produser#1set:10
Consumer#1getvalue:10

根据生产者和消费者的行为，我的线程无法正常工作。我已将我的输出附加在那里以便更好地理解，所以我的代码中的问题在哪里请验证我，提前谢谢

Answer 1

您的制作人和消费者正按照预期的顺序制作和使用这些数字。但是，输出不同步，因为您不以同步方法打印它，因此每次执行时都会得到不同的顺序。

如果您将println语句移至同步get和set方法：

    public synchronized int get() {
        while (available == false) {
            // System.out.println("sharedresorce,while(false)");
            try {
                // /System.out.println("sharedresorce,while(false)object block");
                wait();
                // System.out.println("sharedresorce,while(false)object relise");
            } catch (Exception e) {
                // System.out.println("Thread Interrupted");
            }
        }
        available = false;
        notify();
        System.out.println("Consumer#"  + "getvalue:" + contents);
        return contents;
    }

    public synchronized void set(int value) {
        while (available == true) {
            try {
                wait();
            } catch (Exception e) {
                System.out.println("Thread Interrupted");
            }
        }
        contents = value;
        available = true;
        System.out.println("produser#" + "set:" + value);
        notify();
    }

您将获得预期的输出：

produser#set:1
Consumer#getvalue:1
produser#set:2
Consumer#getvalue:2
produser#set:3
Consumer#getvalue:3
produser#set:4
Consumer#getvalue:4
produser#set:5
Consumer#getvalue:5
produser#set:6
Consumer#getvalue:6
produser#set:7
Consumer#getvalue:7
produser#set:8
Consumer#getvalue:8
produser#set:9
Consumer#getvalue:9
produser#set:10
Consumer#getvalue:10

生产者/消费者多线程代码未按预期工作

1 个答案: