来自另一个类的Java setText JLabel

时间：2016-04-26 23:24:35

标签： java swing

你好，我有两个类，一个只包含我的GUI，另一个包含我的方法。我需要从我的Blackjack类的方法中更新我的BlackjackGUI类中的playerMoneyLbl标签。我想我需要先将int转换为字符串才能显示为标签，但我的代码不起作用。我很感激任何帮助。这是我的代码：

BlackjackGUI Class 

import javax.swing.*;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;

public class BlackjackGUI{

    private JFrame frame;
    private JPanel panel, panelTop, panelBottom, panelCenter, panelHitBtn, panelStandBtn;
    private JButton newGameBtn, dealBtn, hitBtn, standBtn;
    JLabel placeBetLbl, playerMoneyLbl, playerCardLbl, dealerCardLbl, playerCardTotalLbl, dealerCardTotalLbl;
    private JTextField betInputBox;
    private Blackjack Blackjack = new Blackjack();


    Color bg = new Color(0, 100, 0);

    public BlackjackGUI(){
        createForm();

        fillTop();
        fillCenter();
        fillBottom();

        frame.add(panel);
        frame.setVisible(true);
    }

    public void createForm() {
        frame = new JFrame("Blackjack");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setSize(1000,900);

        panel = new JPanel();
        panel.setLayout(new BorderLayout());
        panel.setBackground(bg);

        panelTop = new JPanel();
        panelTop.setBackground(bg);
        panel.add(panelTop, BorderLayout.NORTH);

        panelBottom = new JPanel();
        panelBottom.setBackground(bg);
        panel.add(panelBottom, BorderLayout.SOUTH);

        panelCenter = new JPanel();
        panelCenter.setLayout(new GridLayout(3, 2));
        panelCenter.setBackground(bg);
        panel.add(panelCenter, BorderLayout.CENTER);

    }

    public void fillTop() {

        newGameBtn = new JButton("New Game");
        newGameBtn.setFont(new Font("Gill Sans MT", Font.PLAIN, 16));
        panelTop.add(newGameBtn);
        newGameBtn.addActionListener(new ActionListener() {

            @Override
            public void actionPerformed(ActionEvent event) {
                System.exit(0);

            }
        });


    }

    public void fillCenter() {

                ImageIcon defaultDealerCard1 = new ImageIcon("Images/Cards/BACK.png");
                dealerCardLbl = new JLabel();
                dealerCardLbl.setIcon(defaultDealerCard1);
                dealerCardLbl.setHorizontalAlignment(dealerCardLbl.CENTER);
                panelCenter.add(dealerCardLbl);

                dealerCardTotalLbl = new JLabel("5");
                dealerCardTotalLbl.setFont(new Font("Gill Sans MT", Font.PLAIN, 35));
                dealerCardTotalLbl.setForeground(Color.WHITE);
                dealerCardTotalLbl.setHorizontalAlignment(dealerCardTotalLbl.CENTER);
                panelCenter.add(dealerCardTotalLbl);

                ImageIcon defaultPlayerCard1 = new ImageIcon("Images/Cards/BACK.png");
                playerCardLbl = new JLabel();
                playerCardLbl.setIcon(defaultPlayerCard1);
                playerCardLbl.setHorizontalAlignment(playerCardLbl.CENTER);
                panelCenter.add(playerCardLbl);

                playerCardTotalLbl = new JLabel("16 - BUST! You lose :(");
                playerCardTotalLbl.setFont(new Font("Gill Sans MT", Font.PLAIN, 35));
                playerCardTotalLbl.setForeground(Color.WHITE);
                playerCardTotalLbl.setHorizontalAlignment(playerCardTotalLbl.CENTER);
                panelCenter.add(playerCardTotalLbl);

                panelHitBtn = new JPanel();
                panelHitBtn.setLayout(new GridLayout(3, 3));
                panelHitBtn.setBackground(bg);
                panelCenter.add(panelHitBtn);

                panelStandBtn = new JPanel();
                panelStandBtn.setLayout(new GridLayout(3, 3));
                panelStandBtn.setBackground(bg);
                panelCenter.add(panelStandBtn);

                hitBtn = new JButton("Hit");
                hitBtn.setMaximumSize( new Dimension (50,50));
                hitBtn.setHorizontalAlignment(hitBtn.CENTER);
                hitBtn.setVerticalAlignment(hitBtn.CENTER);
                panelHitBtn.add(hitBtn, BorderLayout.CENTER);
                hitBtn.setVisible(false);

                hitBtn = new JButton("Hit");
                hitBtn.setMaximumSize( new Dimension (50,50));
                hitBtn.setHorizontalAlignment(hitBtn.CENTER);
                hitBtn.setVerticalAlignment(hitBtn.CENTER);
                panelHitBtn.add(hitBtn, BorderLayout.CENTER);
                hitBtn.setVisible(false);

                hitBtn = new JButton("Hit");
                hitBtn.setMaximumSize( new Dimension (50,50));
                hitBtn.setHorizontalAlignment(hitBtn.CENTER);
                hitBtn.setVerticalAlignment(hitBtn.CENTER);
                panelHitBtn.add(hitBtn, BorderLayout.CENTER);
                hitBtn.setVisible(false);

                hitBtn = new JButton("Hit");
                hitBtn.setMaximumSize( new Dimension (50,50));
                hitBtn.setHorizontalAlignment(hitBtn.CENTER);
                hitBtn.setVerticalAlignment(hitBtn.CENTER);
                panelHitBtn.add(hitBtn, BorderLayout.CENTER);
                hitBtn.setVisible(false);

                hitBtn = new JButton("HIT"); //KEEP THIS ONE
                hitBtn.setFont(new Font("Gill Sans MT", Font.PLAIN, 35));
                hitBtn.setHorizontalAlignment(hitBtn.CENTER);
                hitBtn.setVerticalAlignment(hitBtn.CENTER);
                panelHitBtn.add(hitBtn, BorderLayout.CENTER);

                hitBtn = new JButton("Hit");
                hitBtn.setMaximumSize( new Dimension (50,50));
                hitBtn.setHorizontalAlignment(hitBtn.CENTER);
                hitBtn.setVerticalAlignment(hitBtn.CENTER);
                panelHitBtn.add(hitBtn, BorderLayout.CENTER);
                hitBtn.setVisible(false);

                hitBtn = new JButton("Hit");
                hitBtn.setMaximumSize( new Dimension (50,50));
                hitBtn.setHorizontalAlignment(hitBtn.CENTER);
                hitBtn.setVerticalAlignment(hitBtn.CENTER);
                panelHitBtn.add(hitBtn, BorderLayout.CENTER);
                hitBtn.setVisible(false);

                hitBtn = new JButton("Hit");
                hitBtn.setMaximumSize( new Dimension (50,50));
                hitBtn.setHorizontalAlignment(hitBtn.CENTER);
                hitBtn.setVerticalAlignment(hitBtn.CENTER);
                panelHitBtn.add(hitBtn, BorderLayout.CENTER);
                hitBtn.setVisible(false);

                hitBtn = new JButton("Hit");
                hitBtn.setMaximumSize( new Dimension (50,50));
                hitBtn.setHorizontalAlignment(hitBtn.CENTER);
                hitBtn.setVerticalAlignment(hitBtn.CENTER);
                panelHitBtn.add(hitBtn, BorderLayout.CENTER);
                hitBtn.setVisible(false);

                standBtn = new JButton("Stand");
                panelStandBtn.add(standBtn);
                standBtn.setVisible(false);

                standBtn = new JButton("Stand");
                panelStandBtn.add(standBtn);
                standBtn.setVisible(false);

                standBtn = new JButton("Stand");
                panelStandBtn.add(standBtn);
                standBtn.setVisible(false);

                standBtn = new JButton("Stand");
                panelStandBtn.add(standBtn);
                standBtn.setVisible(false);

                standBtn = new JButton("STAND");
                standBtn.setFont(new Font("Gill Sans MT", Font.PLAIN, 35));
                panelStandBtn.add(standBtn);

                standBtn = new JButton("Stand");
                panelStandBtn.add(standBtn);
                standBtn.setVisible(false);

                standBtn = new JButton("Stand");
                panelStandBtn.add(standBtn);
                standBtn.setVisible(false);

                standBtn = new JButton("Stand");
                panelStandBtn.add(standBtn);
                standBtn.setVisible(false);

                standBtn = new JButton("Stand");
                panelStandBtn.add(standBtn);
                standBtn.setVisible(false);     

    }

    public void fillBottom() {

        betInputBox = new JTextField("25");
        betInputBox.setFont(new Font("Gill Sans MT", Font.PLAIN, 35));
        betInputBox.setHorizontalAlignment(SwingConstants.RIGHT);
        betInputBox.setPreferredSize(new Dimension(175,50));
        betInputBox.addMouseListener(new MouseAdapter(){
            @Override
            public void mouseClicked(MouseEvent e){
                betInputBox.setText("");
            }
        });
        panelBottom.add(betInputBox, BorderLayout.WEST);

        dealBtn = new JButton("DEAL");
        dealBtn.setFont(new Font("Gill Sans MT", Font.PLAIN, 35));
        panelBottom.add(dealBtn);
        newGameBtn.addActionListener(new ActionListener() {

            @Override
            public void actionPerformed(ActionEvent event) {
                System.exit(0);

            }
        });

        placeBetLbl = new JLabel("Place your bets!");
        placeBetLbl.setFont(new Font("Gill Sans MT", Font.PLAIN, 35));
        placeBetLbl.setForeground(Color.YELLOW);
        panelBottom.add(placeBetLbl);

        playerMoneyLbl = new JLabel();
        playerMoneyLbl.setFont(new Font("Gill Sans MT", Font.PLAIN, 35));
        playerMoneyLbl.setForeground(Color.WHITE);
        panelBottom.add(playerMoneyLbl, BorderLayout.EAST);

    }

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

    }

}

二十一点类

public class Blackjack {

    int playerMoney = 2222;
    String playerMoneyString;

    public void process(){
        playerMoneyString = Integer.toString(playerMoney);
        BlackjackGUI.playerMoneyLbl.setText

    }

    public void deal() {
        //deal code goes here.
    }



}

2 个答案:

答案 0 :(得分：2)

你有很多选择，有些好，有些不好

你可以......

将JLabel的引用传递给另一个类。这有点不好：

  • 因为它将UI组件暴露给类
  • 将代码结合在一起，使得将来难以管理或更改
  • 将UI组件暴露给另一个类，以允许它取消选中对其或其他组件的更改
  • 真的超出了第二堂课的责任范围。当事情发生变化时，它会关注你想要发生什么？

你可以......

使用Observer Pattern，允许感兴趣的各方将自己注册到第二类​​，这样当某个事件发生时，第二类可以通知感兴趣的各方，然后他们可以采取他们想要的任何行动根据自己的个人需求

此：

  • 解密代码，因为没有任何一块依赖另一块，以便将来更容易更改和修改代码
  • 定义并分离类别
    • 的责任范围

您可能还想查看Model-View-Controller，它可能会为您提供有关如何构建代码的更多建议

答案 1 :(得分：0)

我认为更好的方法是在Blackjack类中创建一个getter方法并更新BlackjackGUI类中的标签（因为它是一个GUI类，它应该是执行GUI的东西，比如更新标签）。

此外，您正在尝试访问playerMoneyLbl变量，就好像它是静态的（BlackjackGUI.playerMoneyLbl），但事实并非如此。

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