线程进水与出水问题实现

Posted 2020-08-09 小董斌

问题：有一个水池，水池的容量是固定 的20L,一边为进水口,一边为出水口.要求,进水与放水不能同时进行.

水池一旦满了不能继续注水,一旦放空了,不可以继续放水. 进水的速度5L/s , 放水的速度2L/s

分析：创建2个线程，一个进水，一个用于放水。这里以秒为单位，进水每次进5L，放水每次放2L

如果当前水量小于2L,则不能放水。如果当前水量大于15L,则不能加水。

 

具体实现如下：

package com.dongbin.thread;


//容量
class Water{
    private double total = 0;

    public double getTotal() {
        return total;
    }

    public void setTotal(double total) {
        this.total = total;
    }
    
}

//进水
class InputWater extends Thread{
    
    private Water water;
    
    public InputWater(Water water) {
        this.water = water;
    }
    
    @Override
    public void run() {

        while (true) {
            synchronized (water) {
                if (water.getTotal() <= 15) {
                    // 进水 按秒进
                    try {
                        Thread.sleep(1000);
                    } catch (InterruptedException e) {
                        e.printStackTrace();
                    }
                    water.setTotal(water.getTotal() + 5);
                    System.out.println(Thread.currentThread().getName()
                            + ": 进水5L,目前水量" + water.getTotal() + "L!!!");
                    water.notify();// 唤醒放水线程
                } else {
                    System.out.println(Thread.currentThread().getName()
                            + ": 不能再加水了！！！ ");
                    try {
                        water.wait();// 进水线程等待
                    } catch (InterruptedException e) {
                        e.printStackTrace();
                    }
                }
            }

        }
    }
}

//放水
class OutWater extends Thread{
    private Water water;

    public OutWater(Water water) {
        this.water = water;
    }
    
    @Override
    public void run() {
        
        while (true) {
            synchronized (water) {
                if (water.getTotal() >= 2) {
                    // 放水
                    try {
                        Thread.sleep(1000);
                    } catch (InterruptedException e) {
                        e.printStackTrace();
                    }
                    water.setTotal(water.getTotal() - 2);
                    System.out.println(Thread.currentThread().getName()
                            + ": 放水2L,目前水量" + water.getTotal() + "L");
                    water.notify();// 唤醒进水线程
                } else {
                    // 等待加水
                    System.out.println(Thread.currentThread().getName()
                            + ":不能放水了！！！ ");
                    try {
                        water.wait();// 放水线程等待
                    } catch (InterruptedException e) {
                        e.printStackTrace();
                    }
                }
            }
        }
    }
}
public class Test {

    public static void main(String[] args) {
        Water water = new Water();
        InputWater inputWater = new InputWater(water);
        inputWater.setName("进水线程");
        
        OutWater outWater = new OutWater(water);
        outWater.setName("放水线程");
        
        //启动线程
        
        inputWater.start();
        outWater.start();
        

    }

}

 结果：