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私は Java で三目並べゲームを作成し、GUI を作成し、それを実行してテストしたかったのですが、いくつかのエラーが発生しています。理由がわからず、誰かがこれらのエラーが発生する理由と、それらを修正するために何をすべきかを説明できることを望んでいました. 私が得ているエラーは次のとおりです: TicTacToeSwing.(TicTacToeSwing.java:84) の TicTacToeSwing.main(TicTacToeSwing.java:180) でのスレッド "メイン" java.lang.NullPointerException の例外

これが私のコードです: (注意してください: GUI を最初に動かしたかったので、まだ計算を行っていません)

    import java.awt.BorderLayout;
    import java.awt.Color;
    import java.awt.Container;
    import java.awt.GridLayout;
    import java.awt.event.ActionListener;

    import javax.swing.JButton;
    import javax.swing.JFrame;
    import javax.swing.JLabel;
    import javax.swing.JPanel;
    import javax.swing.JTextField;

    import java.awt.*;
    import java.awt.event.*;
    import javax.swing.*;

//○×ゲーム

    public class TicTacToeSwing extends JFrame
    implements ActionListener { 

//JButtons

//private JButton button1 = new JButton("");    
private JButton jbtnTicTacToe1;
private JButton jbtnTicTacToe2;
private JButton jbtnTicTacToe3;
private JButton jbtnTicTacToe4;
private JButton jbtnTicTacToe5;
private JButton jbtnTicTacToe6;
private JButton jbtnTicTacToe7;
private JButton jbtnTicTacToe8;
private JButton jbtnTicTacToe9;

private JButton jbtnExit;
private JButton jbtnReset;

//JFrame window = new JFrame("Tic-Tac-Toe Swing ");
private JFrame window = new JFrame("Tic-Tac-Toe");


//labels
private JLabel jlblPlayerX = new JLabel ("X");
private JLabel jlblPlayerO = new JLabel ("O");

//text fields
JTextField jtfName = new JTextField(20);
private JTextField jtfPlayerX = new JTextField("X");
private JTextField jtfPlayerO = new JTextField("O");

//Panels
JPanel jpnlMain = new JPanel ();
    JPanel jpnlFamily = new JPanel();
    JPanel jpnlNorth = new JPanel();
    JPanel jpnlSouth = new JPanel();
    JPanel jpnlCenter = new JPanel();
    JPanel jpnlTop = new JPanel();
    JPanel jpnlBottom = new JPanel();

//Class Constructor
public TicTacToeSwing () {

    //Prepare JFrame/Window
    super ("Tic Tac Toe");
    setSize(400,400);
    setTitle("Tic Tac Toe Swing");
    setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

    //Set the layouts for 3 rows and 3 columns
    jpnlMain.setLayout(new BorderLayout(3,3));
    jpnlCenter.setLayout(new GridLayout());
    jpnlSouth.setLayout(new GridLayout());
    jpnlTop.setLayout(new BorderLayout());
    jpnlBottom.setLayout(new BorderLayout());

    //Center Panel
    jpnlCenter.add(jlblPlayerX);
    jpnlCenter.add(jlblPlayerO);

    //identify each JButton
    jbtnReset.setActionCommand("Reset");
    jbtnExit.setActionCommand("Exit");

    //register JButton for event handling by using the THIS keyword - THIS class will handle the events
    jbtnReset.addActionListener(this);
    jbtnExit.addActionListener(this);

    /*Add Buttons To The Window*/
    window.add(jbtnTicTacToe1);
    window.add(jbtnTicTacToe2);
    window.add(jbtnTicTacToe3);
    window.add(jbtnTicTacToe4);
    window.add(jbtnTicTacToe5);
    window.add(jbtnTicTacToe6);
    window.add(jbtnTicTacToe7);
    window.add(jbtnTicTacToe8);
    window.add(jbtnTicTacToe9);

    /*Add The Action Listener To The Buttons
    button1.addActionListener(this);
    button2.addActionListener(this);
    button3.addActionListener(this);
    button4.addActionListener(this);
    button5.addActionListener(this);
    button6.addActionListener(this);
    button7.addActionListener(this);
    button8.addActionListener(this);
    button9.addActionListener(this);
    */

    jbtnTicTacToe1.addActionListener(this);
    jbtnTicTacToe2.addActionListener(this);
    jbtnTicTacToe3.addActionListener(this);
    jbtnTicTacToe4.addActionListener(this);
    jbtnTicTacToe5.addActionListener(this);
    jbtnTicTacToe6.addActionListener(this);
    jbtnTicTacToe7.addActionListener(this);
    jbtnTicTacToe8.addActionListener(this);
    jbtnTicTacToe9.addActionListener(this);

    //South Button Panel
    jpnlSouth.add(jbtnReset);
    jpnlSouth.add(jbtnExit);

    /* Instantiate JButtons, put into a method for efficiency
    jbtn1 = instantiateJButton("1", Color.PINK);
    jbtn2 = instantiateJButton("2", Color.PINK);
    jbtn3 = instantiateJButton("3", Color.PINK);
    jbtn4 = instantiateJButton("4", Color.PINK);
    jbtn5 = instantiateJButton("5", Color.PINK);
    jbtn6 = instantiateJButton("6", Color.PINK);
    jbtn7 = instantiateJButton("7", Color.PINK);
    jbtn8 = instantiateJButton("8", Color.PINK);
    jbtn9 = instantiateJButton("9", Color.PINK);
    */

    //Finalize screen layout and publish to the display
    jpnlMain.add(jpnlCenter, BorderLayout.NORTH);
    jpnlMain.add(jpnlSouth, BorderLayout.CENTER);

    //Prepare the container
    Container ca = getContentPane();
    ca.setBackground (Color.LIGHT_GRAY);
    ca.add(jpnlMain);
    setContentPane (ca);

    setVisible(true);
    //end constructor       
}

//CLASS EVENT HANDLER
public void actionPerformed(java.awt.event.ActionEvent e)
{
    //find out which JButton was pressed by using the Action Command
    String sActionCommand = e.getActionCommand();

    //EXIT JButton
    if (sActionCommand == "Exit")
    {
        System.exit(0);
    }

    //RESET JButton
    else if (sActionCommand == "Reset")
    {
        jtfPlayerX.setText("");
        jtfPlayerO.setText("");
    }
}   //end ACTIONPERFORMED (java.awt.event.ActionEvent e)

/**
 * @param args
 */
public static void main(String[] args) {
    //EXECUTION STARTING POINT

    TicTacToeSwing TicTacToeSwing = new TicTacToeSwing();

    //TicTacToeSwing TicTacToeObject = new TicTacToeSwing();

}//end main(String[] args)

   }//end TicTacToeSwing class
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3 に答える 3

1

あなたが持っている場所：

private JButton jbtnExit;
private JButton jbtnReset;

試す：

private JButton jbtnExit = new JButton("Exit"); 
private JButton jbtnReset = new JButton("Reset");
于 2013-04-22T15:57:00.477 に答える
1

スタック トレースを見ると、次のような場所TicTacToeSwing.java:84にエラーが発生している場所が表示されます。TicTacToeSwing.javaはファイルで、:84行番号 84 を意味します。

于 2013-04-22T15:58:03.263 に答える