java多執行緒之消費生產模型

• 2020 年 8 月 22 日
• 筆記
• JAVA

需求：要求倉庫最大容量為4，且一共只生產20台電視機，下面的程式碼只適用於一個生產者一個消費者，有沒有大佬提點建議怎麼改成一對多或多對多不會出現死鎖情況

class Warehouse {

    private int TVCount = 0;

    // 生產

    public synchronized void produce() {
        if (TVCount < 4) {
            TVCount++;
            System.out.println(Thread.currentThread().getName() + "開始生產第 " + TVCount + " 台電視");
            try {
                Thread.sleep(100);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
            super.notify();

        } else {
            try {
                super.wait();
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        }
    }

    // 消費

    public synchronized void consume() {

        if (TVCount > 0) {
            System.out.println(Thread.currentThread().getName() + "開始消費第 " + TVCount + " 台電視");
            TVCount--;
            try {
                Thread.sleep(100);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
            super.notify();
        } else {
            try {
                super.wait();
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        }

    }

}

class Productor extends Thread {

    private Warehouse warehouse;

    public Productor(Warehouse warehouse) {
        this.warehouse = warehouse;
    }

    @Override
    public void run() {
        System.out.println("開始生產電視機");
        for (int i = 0; i < 20; i++) {
            try {
                sleep(10);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
            warehouse.produce();
        }
    }
}

class Consumer extends Thread {
    private Warehouse warehouse;

    public Consumer(Warehouse warehouse) {
        this.warehouse = warehouse;
    }

    @Override
    public void run() {
        System.out.println("開始消費新產品");
        for (int i = 0; i < 20; i++) {
            try {
                sleep(10);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
            warehouse.consume();
        }
    }
}

public class ThreadExer5 {
    public static void main(String[] args) {
        Warehouse warehouse = new Warehouse();

        Productor t1 = new Productor(warehouse);
//        Productor t3 = new Productor(warehouse);
        Consumer t2 = new Consumer(warehouse);

        t1.setName("生產者1");
        t2.setName("消費者1");
//        t3.setName("生產者2");

        t1.start();
        t2.start();
//        t3.start();
    }
}