Question

我正在做一个使用JAVA制作棋盘游戏的项目。现在我想要一个玩家获胜，分数将显示在Jtextfield中。为了做到这一点，我首先使用一个方法从GamePlan类中的Declarewin方法（）中的Player1Graphics类中获取JTextfield。但是这个向我展示了一个NullPointerException。

所以我想到了另一种方式。因为我不能将GameGui类的对象赋予任何其他类，因为它会创建无限循环。所以我使用了另一个名为Player类的类，并创建了一个变量＆＃34; SName＆＃34;这将取得＆＃34;得分＆＃34;在decarewin（）方法中的变量。然后我在Player1Graphics类中使用了updatetextfied（）方法，该类是GameGui类的内部类，并设置＆＃34; SName＆＃34;现在，所有变量运行良好，它们正在按预期传递值，JTextfield文本值也在更新，但JTextfield的视觉效果没有更新。它没有从0更改为1或1到2。

我正在给下面的代码.............

这是来自GameGui Class ........

的代码

public class GameGui extends JFrame{


    GameGui(){

    super("Board");
    this.setVisible(true);
    this.setSize(700,800);
    this.setLocationRelativeTo(null);
    this.setResizable(false);
    this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

    this.setContentPane(main_panel);
    main_panel.setLayout(new BorderLayout());
    main_panel.setBackground(Color.WHITE);

    resourcer();

}


resourcer(){


//players
    JPanel playersroom = new JPanel();

    //playersroom.setBorder(BorderFactory.createLineBorder(Color.black, 1));
    playersroom.setBackground(Color.white);
    playersroom.setLayout(new BorderLayout());

    JPanel player1room = new JPanel();
    player1room.setLayout(new BorderLayout());
    //player1room.setBorder(BorderFactory.createMatteBorder(0, 0, 0, 1, Color.BLACK));
    player1room.setPreferredSize(new Dimension(350,300));
    player1room.add(new Player1graphics(),BorderLayout.CENTER);
    playersroom.add(player1room,BorderLayout.WEST);


    arena.add(playersroom,BorderLayout.CENTER);




    main_panel.add(arena,BorderLayout.SOUTH);






}

这是拥有JTextfield的player1Graphics类，它是GameGui类的内部类。

public class Player1graphics extends JPanel{
    private String newname;
     JLabel name = new JLabel("PLAYER 1",SwingConstants.CENTER);
    JButton setname = new JButton("CN");
    GamePlan g = new GamePlan();
    JButton token = new JButton("POISON");

    JTextField showscore = new JTextField(20); //this is the JTextfield


    Player1graphics(){
        //repaint();
        this.setLayout(null);
        this.setBackground(new Color(255,220,154));


        //setname code & name code
        //JButton setname = new JButton("CN");

        setname.setBounds(160, 40, 30, 20);
        setname.setBorder( BorderFactory.createLineBorder(Color.black, 1, true));
        setname.setToolTipText("Change the name");




        name.setBounds(132, 70, 80, 30);
        name.setOpaque(true);
        name.setBackground(new Color(102,140,185));
        name.setForeground(new Color(202,208,215));
        name.setBorder(BorderFactory.createLineBorder(Color.black, 1));




    setname.addActionListener(new ActionListener() {

            @Override
            public  void  actionPerformed(ActionEvent e) {


                 newname = JOptionPane.showInputDialog(null,"ENTER YOUR NAME");
                if (newname==null){
                name.setText("PLAYER 1");
                }else{
                    t1=1;
                name.setText(newname);

                getfirstplayername(newname);
                }

            }
        });


        //token button code
        //JButton token = new JButton("POISON");
        token.setBackground(new Color(233,249,254));


        token.setBounds(132, 110, 80, 30);
        token.setToolTipText("token can be used only one time");
        ActionClass ac = new ActionClass();
        ac.getfirstplayerpoisonbutton(token);
        token.addActionListener(ac);


        //won and showin textfieldcode
        JLabel won = new JLabel("Won",SwingConstants.CENTER);
        won.setBorder( BorderFactory.createLineBorder(new Color(102,140,185), 2, true));
        won.setBounds(132, 150, 50, 30);
        won.setBackground(new Color(102,140,185));
        won.setForeground(Color.WHITE);

//JTextfield codes
        //JTextField showwin = new JTextField();
        //GamePlan gm = new GamePlan();

        Player player = new Player();
        showscore.setBounds(185, 150, 30, 30);

        showscore.setEditable(false);

        //showwin.setOpaque(true);
        //showwin.setBackground(Color.WHITE);
        //showwin.setText(player.sname);
        updatetextfield(player.sname);

        this.add(name);
        this.add(setname);
        this.add(token);
        this.add(won);
        this.add(showscore);
        repaint();

    }

    public void paintComponent(Graphics g){
        super.paintComponent(g);
        Graphics2D myg = (Graphics2D) g;
        myg.setStroke(new BasicStroke(1));
        myg.setColor(new Color(163,193,231));
        myg.fillOval(25, 10, 300, 200);


    }


    public void updatetextfield(String s){



        showscore.setText(s);
        showscore.repaint();

        //JOptionPane.showMessageDialog(null, showwin.getText());
    }



}

这是JTextfield代码.................

    JTextField showscore = new JTextField(20);
    Player player = new Player();

        showscore.setBounds(185, 150, 30, 30);

        showscore.setEditable(false);
        updatetextfield(player.sname);

这是updatetextfield方法代码..........

public void updatetextfield(String s){



        showscore.setText(s);
        showscore.repaint();

        //JOptionPane.showMessageDialog(null, showscore.getText());
    }

这是我在播放器类中创建的变量..........

public class Player{

 String sname =  Integer.toString(GamePlan.score);


}

这是一个declarewin方法，其中得分变量更新，它位于另一个名为GamePlan Class的类中。

public class GamePlan{

static int score=0;  


public void declarewin(){

    score++;  //score variable updating

    for(int i=0;i<20;i++){
        for(int j=0;j<20;j++){
            bbutton[i][j].setEnabled(false);
        }
    }

    JOptionPane.showMessageDialog(null, score);
    Player pl = new Player();
    JOptionPane.showMessageDialog(null, pl.sname);

    JOptionPane.showMessageDialog(null, "YOU have won the   game");
}

我已经使用了很多JOption来查看变量是否正在传递值，而且我还使用了gettext（）方法来查看JTextfield的值是否正在发生变化。是的，所有值都在变化但是只有Textfield的视觉效果不会改变。虽然在JTextfield内部文本值为1或2，但它在GUI中显示为0.IT永远不会改变................

我花了几个小时来解决这个问题，但我无法解决这个问题。这只会让我发疯。

有人请帮忙让我摆脱这个烂摊子.............：| ：|

为什么JTextfield的文本值不会通过使用变量直观地改变？

0 个答案: