我需要船只同時裝卸貨物。有沒有辦法在java中做到這一點？我設法讓多艘船同時在港口工作，但他們先卸貨，然后再裝載新的板條箱。那是我的 Ship 類變體public class Ship implements Runnable {    String name;    Port port;    Queue<Goods> storage;    Pier pier;    int capacity;    int numOnBoard;    public Ship(String name, Port port, int capacity) {        this.name = name;        this.port = port;        storage = new LinkedBlockingDeque<>(capacity);        this.capacity = capacity;        int num=(int)(Math.random()*capacity);        numOnBoard=num;        for (int i = 0; i < num; i++) {            storage.add(new Goods());        }    }    public void run() {        try {            int unl = 0;            int l = 0;            pier = port.getPier();            System.out.println("Ship " + name + " taken " + pier.name);            while (unload()) {                if(unl>=numOnBoard) break;                unl++;                System.out.println("Ship " + name + " unloaded cargo.");                Thread.sleep(new Random(100).nextInt(500));            }            System.out.println("Ship " + name + " unloaded " + unl + " crates.");            Thread.sleep(100);            while (load()) {                l++;                System.out.println("Ship " + name + " loaded cargo.");                Thread.sleep(new Random(100).nextInt(500));            }            System.out.println("Ship " + name + " loaded " + l + " crates.");            port.releasePier(pier);            System.out.println("Ship " + name + " released " + pier.name);        } catch (InterruptedException e) {            e.printStackTrace();        }    }    private boolean unload() {        if (storage.size() <= 0) return false;        return port.addGoods(storage.poll());    }    private boolean load() {        if (storage.size() >= capacity) return false;        return port.takeGoods(storage,numOnBoard);    }}和港口