Question

我目前正在学习java，并选择了既有趣又有半挑战性的项目。我的项目是基于一个70年代至80年代的老式游戏，我小时曾经玩过，叫做DopeWars。

这是我构建这个游戏的第二次尝试，第一次尝试是通过将我的所有代码放在一个.java文件中完成的，这个文件成功到了必须停止的结果，因为它不断地在代码中迷失。

我的第二次尝试，我试图将我的代码分解为逻辑部分，在许多但是小型.java文件之间共享。我认为这种方法很容易处理，但发现它创造了比其他任何问题更多的问题。

应该怎么做：在我正在运行的应用程序中导航时，系统会提示用户选择他/她的播放器。然后，从默认的起始国家，用户可以购买/出售一些优质产品。然后用户可以按下“旅行”按钮（xx），按下允许说英格兰按钮（tEng）来选择目的地，然后运送到所选目的地以获得他投资的回报。希望用户很幸运能够在他的新目的地找到一个很好的产品。

我的问题：我试过什么我不能去一个新的目的地。当我点击我要去的国家时，同一个国家我会再次弹出。目前，它设置为在按下按钮时创建新的“国家/地区”对象。此外，我希望它能做到以下几点：当用户离开英格兰，前往德国，然后返回英国。 Englands随机生成的价格从英格兰首次刷新。或者与德国相反。

我所能想到的只是问题在于英格兰物体一旦被打开，就需要关闭。当用户下次导航回英格兰时，允许创建新的英格兰对象，从而为用户生成新的随机价格，以便买入或卖出。

根据我的理论，我的尝试在jbutton xx（旅行按钮）的按下上以某种方式破坏，处置或移除了英格兰物体。

理想情况下，我希望保留大部分代码，因为任何根本性的改变都可能会让我感到困惑。我还删除了所有失败的代码。任何帮助将不胜感激。提前谢谢。

PlayerSelect.java：

package ggg;

import java.awt.Color;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import ggg.GUI;

public class PlayerSelect implements ActionListener{

JFrame fr;
JPanel playerSelect;
JButton playerSelect1, playerSelect2, playerSelect3, playerSelect4, playerSelect5, playerSelect6;
JLabel q, n1, n2, n3, n4, n5, n6;

public PlayerSelect(){

    fr = new JFrame("DopeWars 2014");
    fr.setSize(580, 445);
    fr.setLocation(10, 10);
    fr.setLayout(null);
    fr.setBackground(Color.black);
    fr.setLocationRelativeTo(null);
    fr.setVisible(true);

    playerSelect = new JPanel();
    playerSelect.setSize(650, 500);
    playerSelect.setLocation(0, 0);
    playerSelect.setLayout(null);
    playerSelect.setBackground(Color.black);
    playerSelect.setVisible(true);

    playerSelect1 = new JButton();
    playerSelect1.setSize(177, 135);
    playerSelect1.setLocation(10, 115);
    playerSelect1.setLayout(null);
    playerSelect1.setBackground(Color.pink);
    playerSelect1.addActionListener(this);

    playerSelect2 = new JButton();
    playerSelect2.setSize(177, 135);
    playerSelect2.setLocation(197, 115);
    playerSelect2.setLayout(null);
    playerSelect2.setBackground(Color.green);
    playerSelect2.addActionListener(this);

    playerSelect3 = new JButton();
    playerSelect3.setSize(177, 135);
    playerSelect3.setLocation(384, 115);
    playerSelect3.setLayout(null);
    playerSelect3.setBackground(Color.yellow);
    playerSelect3.addActionListener(this);

    playerSelect4 = new JButton();
    playerSelect4.setSize(177, 135);
    playerSelect4.setLocation(10, 265);
    playerSelect4.setLayout(null);
    playerSelect4.setBackground(Color.magenta);
    playerSelect4.addActionListener(this);

    playerSelect5 = new JButton();
    playerSelect5.setSize(177, 135);
    playerSelect5.setLocation(197, 265);
    playerSelect5.setLayout(null);
    playerSelect5.setBackground(Color.red);
    playerSelect5.addActionListener(this);

    playerSelect6 = new JButton();
    playerSelect6.setSize(177, 135);
    playerSelect6.setLocation(384, 265);
    playerSelect6.setLayout(null);
    playerSelect6.setBackground(Color.blue);
    playerSelect6.addActionListener(this);

    q = new JLabel("Select your player to begin.");
    q.setSize(600, 50);
    q.setLocation(10, 50);
    q.setForeground(Color.white);
    q.setFont(q.getFont().deriveFont(18.0f));

    n1 = new JLabel("Paul");
    n1.setSize(157, 25);
    n1.setLocation(10, 10);
    n1.setBackground(Color.white);

    n2 = new JLabel("Richard");
    n2.setSize(157, 25);
    n2.setLocation(10, 10);
    n2.setBackground(Color.white);

    n3 = new JLabel("Lisa");
    n3.setSize(157, 25);
    n3.setLocation(10, 10);
    n3.setBackground(Color.white);

    n4 = new JLabel("Roger");
    n4.setSize(157, 25);
    n4.setLocation(10, 10);
    n4.setBackground(Color.white);

    n5 = new JLabel("Katherine");
    n5.setSize(157, 25);
    n5.setLocation(10, 10);
    n5.setBackground(Color.white);

    n6 = new JLabel("Harold");
    n6.setSize(157, 25);
    n6.setLocation(10, 10);
    n6.setBackground(Color.white);



    playerSelect1.add(n1);
    playerSelect2.add(n2);
    playerSelect3.add(n3);
    playerSelect4.add(n4);
    playerSelect5.add(n5);
    playerSelect6.add(n6);

    playerSelect.add(q);
    playerSelect.add(playerSelect1);
    playerSelect.add(playerSelect2);
    playerSelect.add(playerSelect3);
    playerSelect.add(playerSelect4);
    playerSelect.add(playerSelect5);
    playerSelect.add(playerSelect6);
    fr.add(playerSelect);

}

@Override
public void actionPerformed(ActionEvent a) {

        GUI b = new GUI();
        England e = new England();

        if (a.getSource() == playerSelect1){
                b.img.setBackground(Color.pink);
                b.img.add(n1);
                b.bg.add(e.england);
                fr.dispose();
        }
        if (a.getSource() == playerSelect2){
                b.img.setBackground(Color.green);
                b.img.add(n2);
                b.bg.add(e.england);
                fr.dispose();
        }
        if (a.getSource() == playerSelect3){
                b.img.setBackground(Color.yellow);
                b.img.add(n3);
                b.bg.add(e.england);
                fr.dispose();
        }
        if (a.getSource() == playerSelect4){
                b.img.setBackground(Color.magenta);
                b.img.add(n4);
                b.bg.add(e.england);
                fr.dispose();
        }
        if (a.getSource() == playerSelect5){
                b.img.setBackground(Color.red);
                b.img.add(n5);
                b.bg.add(e.england);
                fr.dispose();
        }
        if (a.getSource() == playerSelect6){
                b.img.setBackground(Color.blue);
                b.img.add(n6);
                b.bg.add(e.england);
                fr.dispose();
        }
        }
}

GUI.java：

package ggg;

import java.awt.Color;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import ggg.England;
import ggg.Germany;
import ggg.Engine;

public class GUI extends Engine implements ActionListener {

    JFrame f;
    JPanel bg, s, img, t;
    JLabel £, ca, co;
    static JLabel cav, cov;
    JButton x, xx, y, z, btEng, btGerm;

    public GUI(){
           f = new JFrame("FFF");

           bg = new JPanel();
           bg.setSize(650, 500);
           bg.setBackground(Color.darkGray);
           bg.setLayout(null);
           bg.setLocation(0, 0);

           s = new JPanel();
           s.setSize(180, 445);
           s.setBackground(Color.white);
           s.setLayout(null);
           s.setLocation(10, 10);

           img = new JPanel();
           img.setSize(160, 120);
           img.setBackground(Color.blue);
           img.setLayout(null);
           img.setLocation(10, 10);

           x = new JButton("Travel");
           x.setSize(136, 30);
           x.setLocation(202, 10);
           x.addActionListener(this);

           xx = new JButton("Travels");
           xx.setSize(136, 30);
           xx.setLocation(202, 10);
           xx.addActionListener(this);
           xx.setVisible(false);

           y = new JButton("Finance");
           y.setSize(136, 30);
           y.setLocation(349, 10);
           y.addActionListener(this);

           z = new JButton("Investment");
           z.setSize(136, 30);
           z.setLocation(496, 10);
           z.addActionListener(this);





           // STATS WINDOW
           ca = new JLabel("CASH:");
           ca.setSize(70,25);
           ca.setLocation(10, 145);

           £ = new JLabel("£");
           £.setSize(10, 25);
           £.setLocation(80, 145);

           cav = new JLabel();
           cav.setSize(80, 25);
           cav.setLocation(90, 145);
           int aaa = Engine.playerCash;
           String bbb = String.valueOf(aaa);
           cav.setText(bbb);

           co = new JLabel("COCAINE:");
           co.setSize(70, 25);
           co.setLocation(10, 190);

           cov = new JLabel();
           cov.setSize(70, 25);
           cov.setLocation(80, 190);
           int ccc = Engine.playerCoca;
           String ddd = String.valueOf(ccc);
           cov.setText(ddd);

           //Travel Window
           t = new JPanel();
           t.setSize(430, 403);
           t.setBackground(Color.white);
           t.setLayout(null);
           t.setLocation(202, 52);
           t.setVisible(false);

           btEng = new JButton("ENGLAND");
           btEng.setSize(120, 25);
           btEng.setLocation(10, 100);
           btEng.addActionListener(this);

           btGerm = new JButton("GERMANY");
           btGerm.setSize(120, 25);
           btGerm.setLocation(140, 100);
           btGerm.addActionListener(this);

           f.setSize(650, 500);
           f.setLayout(null);
           f.setLocationRelativeTo(null);
           f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
           f.setVisible(true);




           // ADD COMPONENT
           s.add(img);
           s.add(ca);
           s.add(£);
           s.add(cav);
           s.add(co);
           s.add(cov);

           t.add(btEng);
           t.add(btGerm);          

           bg.add(s);
           bg.add(x);
           bg.add(xx);
           bg.add(y);
           bg.add(z);
           bg.add(t);      

           f.add(bg);
    }





    @Override
    public void actionPerformed(ActionEvent a) {
           England e = new England();
           Germany g = new Germany();

           if (a.getSource() == x){
               t.setVisible(true);
           }
           if (a.getSource() == y){

           }
           if (a.getSource() == z){

           }
           if (a.getSource() == xx){
               t.setVisible(true);
               x.setVisible(true);
               xx.setVisible(false);
           }
           if (a.getSource() == btEng){
               bg.add(e.england);
               bg.remove(g.germany);///////////
               xx.setVisible(true);
               x.setVisible(false);
               t.setVisible(false);
           }
           if (a.getSource() == btGerm){
               bg.add(g.germany);
               bg.remove(e.england);
               xx.setVisible(true);
               x.setVisible(false);
               t.setVisible(false);
           }
    }
}

Engine.java：

package ggg;

import javax.swing.JLabel;
import ggg.England;
import ggg.GUI;

public class Engine {

    public static int playerCash = 120;
    public static int playerCoca = 0;

    public int cocaPrice;
    public int cocaQuantity;
    JLabel cp, cq;
    public int cpp, cqq;
    public String cqqq;
    public int total;
    public int deduction;

    public void buyEng(){   

            England.error.setText(null);

            // CocaPrice
            cp = new JLabel();
            cp.setText(England.pr.getText());
            cpp = Integer.parseInt(cp.getText());
            cocaPrice = cpp;

            // CocaQuantity
            cq = new JLabel();
            cq.setText(England.tf.getText());
            cqqq = cq.getText();
            cqq = Integer.parseInt(cqqq);
            cocaQuantity = cqq;     


            // CALCULATIONS
            total = cocaPrice * cocaQuantity;    

            if (playerCash >= total){

                playerCoca = playerCoca + cocaQuantity;
                String q = String.valueOf(playerCoca);

                playerCash = playerCash - total;
                String t = String.valueOf(playerCash);

                GUI.cav.setText(t);
                GUI.cov.setText(q);
                England.tf.setText(null);
                return;
            }
            else {
                England.tf.setText(null);
                England.error.setText("You don't have enough money!");
            }
            return;
    }



    public void sellEng(){

            if (playerCoca > 0){

                England.error.setText(null);

                // CocaPrice
                cp = new JLabel();
                cp.setText(England.pr.getText());
                cpp = Integer.parseInt(cp.getText());
                cocaPrice = cpp;

                // CocaQuantity
                cq = new JLabel();
                cq.setText(England.tf.getText());
                cqqq = cq.getText();
                cqq = Integer.parseInt(cqqq);
                cocaQuantity = cqq;     


                // CALCULATIONS
                total = cocaPrice * cocaQuantity;  

                playerCoca = playerCoca - cocaQuantity;
                String q = String.valueOf(playerCoca);

                playerCash = playerCash + total;
                String t = String.valueOf(playerCash);

                GUI.cav.setText(t);
                GUI.cov.setText(q);
                England.tf.setText(null);
                return;
            }            
            else if (playerCoca <= 0){

                England.tf.setText(null);
                England.error.setText("You don't have anything to sell!");
            }
            return;
    }



    public void buyGerm(){  

        Germany.error.setText(null);

        // CocaPrice
        cp = new JLabel();
        cp.setText(Germany.pr.getText());
        cpp = Integer.parseInt(cp.getText());
        cocaPrice = cpp;

        // CocaQuantity
        cq = new JLabel();
        cq.setText(Germany.tf.getText());
        cqqq = cq.getText();
        cqq = Integer.parseInt(cqqq);
        cocaQuantity = cqq;     


        // CALCULATIONS
        total = cocaPrice * cocaQuantity;    

        if (playerCash >= total){

            playerCoca = playerCoca + cocaQuantity;
            String q = String.valueOf(playerCoca);

            playerCash = playerCash - total;
            String t = String.valueOf(playerCash);

            GUI.cav.setText(t);
            GUI.cov.setText(q);
            Germany.tf.setText(null);
            return;
        }
        else {
            Germany.tf.setText(null);
            Germany.error.setText("You don't have enough money!");
        }
        return;
    }



    public void sellGerm(){

        if (playerCoca > 0){

            Germany.error.setText(null);

            // CocaPrice
            cp = new JLabel();
            cp.setText(Germany.pr.getText());
            cpp = Integer.parseInt(cp.getText());
            cocaPrice = cpp;

            // CocaQuantity
            cq = new JLabel();
            cq.setText(Germany.tf.getText());
            cqqq = cq.getText();
            cqq = Integer.parseInt(cqqq);
            cocaQuantity = cqq;     


            // CALCULATIONS
            total = cocaPrice * cocaQuantity;  

            playerCoca = playerCoca - cocaQuantity;
            String q = String.valueOf(playerCoca);

            playerCash = playerCash + total;
            String t = String.valueOf(playerCash);

            GUI.cav.setText(t);
            GUI.cov.setText(q);
            Germany.tf.setText(null);
            return;
        }            
        else if (playerCoca <= 0){

            Germany.tf.setText(null);
            Germany.error.setText("You don't have anything to sell!");
        }
        return;
    }





    public static void main(String[] args) {
        new PlayerSelect();
    }
}

England.java：

package ggg;

import java.awt.Color;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.Random;
import javax.swing.JButton;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JTextField;
import ggg.Engine;

public class England extends Engine implements ActionListener {

JPanel england, imgEng;

JLabel co2, £co2;
static JLabel pr;
static JLabel error;
static JTextField tf;
JButton b1, b2;


public England(){

    england = new JPanel();
    england.setSize(430, 403);
    england.setBackground(Color.red);
    england.setLayout(null);
    england.setLocation(202, 52);
    england.setVisible(true);

    imgEng = new JPanel();
    imgEng.setSize(410, 80);
    imgEng.setBackground(Color.blue);
    imgEng.setLayout(null);
    imgEng.setLocation(10, 10);

    co2 = new JLabel("COCAINE");
    co2.setSize(70, 25);
    co2.setLocation(10, 100);

    £co2 = new JLabel("£");
    £co2.setSize(10, 25);
    £co2.setLocation(80, 100);

    pr = new JLabel();
    pr.setSize(60, 25);
    pr.setLocation(90, 100);
    Random random1 = new Random();
    int x = random1.nextInt(80) + 1;
    String c = String.valueOf(x);
    pr.setText(c);

    tf = new JTextField();
    tf.setSize(70, 25);
    tf.setLocation(160, 100);   

    b1 = new JButton("BUY");
    b1.setSize(70, 25);
    b1.setLocation(270, 100);
    b1.addActionListener(this);

    b2 = new JButton("SELL");
    b2.setSize(70, 25);
    b2.setLocation(350, 100);
    b2.addActionListener(this);



    // ERROR MESSAGE
    error = new JLabel();
    error.setSize(200, 25);
    error.setLocation(10, 40);



    // ADD COMPONENTS
    england.add(imgEng);
    imgEng.add(error);

    england.add(co2);
    england.add(£co2);
    england.add(pr);
    england.add(tf);
    england.add(b1);
    england.add(b2);    
}



@Override
public void actionPerformed(ActionEvent e) {

    if (e.getSource() == b1){
        Engine a = new Engine();
        a.buyEng();
    }
    if (e.getSource() == b2){
        Engine a = new Engine();
        a.sellEng();
    }   
}
}

Germany.java：

package ggg;

import java.awt.Color;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.Random;
import javax.swing.JButton;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JTextField;
import ggg.Engine;

public class Germany extends Engine implements ActionListener {

JPanel germany, imgGerm;

JLabel co2, £co2;
static JLabel pr;
static JLabel error;
static JTextField tf;
JButton b1, b2;


public Germany(){

    germany = new JPanel();
    germany.setSize(430, 403);
    germany.setBackground(Color.blue);
    germany.setLayout(null);
    germany.setLocation(202, 52);
    germany.setVisible(true);

    imgGerm = new JPanel();
    imgGerm.setSize(410, 80);
    imgGerm.setBackground(Color.red);
    imgGerm.setLayout(null);
    imgGerm.setLocation(10, 10);

    co2 = new JLabel("COCAINE");
    co2.setSize(70, 25);
    co2.setLocation(10, 100);

    £co2 = new JLabel("£");
    £co2.setSize(10, 25);
    £co2.setLocation(80, 100);

    pr = new JLabel();
    pr.setSize(60, 25);
    pr.setLocation(90, 100);
    Random random1 = new Random();
    int x = random1.nextInt(80) + 1;
    String c = String.valueOf(x);
    pr.setText(c);

    tf = new JTextField();
    tf.setSize(70, 25);
    tf.setLocation(160, 100);   

    b1 = new JButton("BUY");
    b1.setSize(70, 25);
    b1.setLocation(270, 100);
    b1.addActionListener(this);

    b2 = new JButton("SELL");
    b2.setSize(70, 25);
    b2.setLocation(350, 100);
    b2.addActionListener(this);



    // ERROR MESSAGE
    error = new JLabel();
    error.setSize(200, 25);
    error.setLocation(10, 40);



    // ADD COMPONENTS
    germany.add(imgGerm);
    imgGerm.add(error);

    germany.add(co2);
    germany.add(£co2);
    germany.add(pr);
    germany.add(tf);
    germany.add(b1);
    germany.add(b2);    
}



@Override
public void actionPerformed(ActionEvent e) {

    if (e.getSource() == b1){
        Engine a = new Engine();
        a.buyGerm();
    }
    if (e.getSource() == b2){
        Engine a = new Engine();
        a.sellGerm();
    }   
}
}

Answer 1

“我的问题：我尝试过什么，我无法前往新目的地。当我点击我要去的国家时，同一个国家我会再次弹出。”

我认为发生的事情是你错过了扩展课程的全部想法。它以 no 的方式使它们引用任何相同的继承对象。为了实现这一点，需要传递相同的对象。

我看到你做的是每按一次按钮就创建一个new Engine()。这就是为什么你要让同一个国家出现的原因。

我建议你使用CardLayout。由于您的England和Germany对象似乎主要由带有组件和逻辑的JPanel组成，因此您可以创建这些类extends JPanel。使用CardLayout将这些面板添加到主面板。如果您想要去不同的国家/地区，只需更改CardLayout的面板即可。请参阅this example如何使用CardLayout，您也可以查看How to Use CardLayout教程

在调用新的JPanel时，在单击JButton时随机生成数字

1 个答案: