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我在处理 java 中的线程通信时遇到问题。我正在做一个项目，将人们连接到 3 个不同的电梯（取决于他们想去的楼层），这些电梯有容量限制。问题是我有三个困难。

  1. 我的代码是基于消费者-生产者问题的，我不知道如何更改它，因此电梯不会等待它满员，而是在一段时间后自行启动。

  2. 另一个是程序在完成循环之前停止。（不知道为什么）。

  3. 如果我尝试检查是否没有选择电梯（通过获取容量）并且不显示它返回 0 楼的信息，则程序不起作用。

我的代码：（电梯 2 和 3 的类和它们的缓冲区是相同的）

public class Proba { //test class
    public static void main(String[] args) {
        Pojemnik c = new Pojemnik();
        Pojemnik1 d = new Pojemnik1();
        Pojemnik2 e = new Pojemnik2();
        Winda p1 = new Winda(c, 1);
        Winda1 p2 = new Winda1(d, 2);
        Winda2 p3 = new Winda2(e, 3);
        Osoba c1 = new Osoba(c, d, e, 1);
        p1.start(); 
        p2.start();
        p3.start();
        c1.start();
    }
}

class Osoba extends Thread  //person class
{
    private Pojemnik pojemnik;
    private Pojemnik1 pojemnik1;
    private Pojemnik2 pojemnik2;
    private int number;
    public Osoba(Pojemnik c, Pojemnik1 d, Pojemnik2 e, int number) {
        pojemnik = c;
        pojemnik1 = d;
        pojemnik2 = e;
        this.number = number;
    }
    public void run() {
        int value = 0;
        for (int i = 0; i < 5; i++) {
            for (int j = 0; j < 5; j++) 
            {
                int k=0;
                while (k==0){ //i dont; want floor 0
                k = -2 + (int)(Math.random()*7);} //choosing floor
                int h;

                if(k>-3&&k<1){ //decision which elevator
                    value = pojemnik.get(); // getting possible capacity
                    if(value>0){
                        pojemnik.put(value-1);} //lowering capacity
                    h=5-value; // how many people are already in 
                    System.out.println("Ktos wsiadl do windy #1" 
                            //+ this.number
                            + " jest w niej " + h + " osob i wybrano pietro nr " + k);
                } 
                if(k>-1&&k<4){
                    value = pojemnik1.get();
                    if(value>0){
                        pojemnik1.put(value-1);}
                    h=5-value;
                    System.out.println("Ktos wsiadl do windy #2" 
                            //+ this.number
                            + " jest w niej " + h + " osob i wybrano pietro nr " + k);
                }
                if(k>3&&k<8){
                    value = pojemnik2.get();
                    if(value>0){
                        pojemnik1.put(value-1);}
                    h=5-value;
                    System.out.println("Ktos wsiadl do windy #3" 
                            //+ this.number
                            + " jest w niej " + h + " osob i wybrano pietro nr " + k);
                }
            }
        }
    }
}


//import java.util.*;
//import java.lang.*;
class Pojemnik  //buffor class
{
    private int contents;
    private boolean available = false;
    public synchronized int get() {
        while (available == false) {
            try {
                wait();
            }
            catch (InterruptedException e) {
            }
        }
        available = false;
        notifyAll();
        return contents;
    }
    public synchronized void put(int value) {
        while (available == true) {
            try {
                wait();
            }
            catch (InterruptedException e) { 
            } 
        }
        contents = value;
        if(value>5){ //way to never get too high capacity
            contents=5;
        }
        available = true;
        notifyAll();
    }
}

// import java.lang.*;   // elevator class
class Winda extends Thread {
    private Pojemnik pojemnik; //bufor
    private int number;

    public Winda(Pojemnik c, int number) {
        pojemnik = c;
        this.number = number;
    }

    public void run() {
        for (int i = 0; i < 10; i++) {
            //pojemnik.get();
            pojemnik.put(5);    // the elevator is empty 5 people can go in
            System.out.println("Winda #" + this.number
                    + " jest na poziomie 0 "); //info that elevator is on floor 0
            try {
                sleep((int)(Math.random() * 100));
            } catch (InterruptedException e) { }
        }
    }
}
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