Java Swing 应用程序不再工作

Question

我对使用 swing 还很陌生，我有一个问题。我的代码今天早上停止工作，但我不知道为什么。我运行了调试器，它显示了 2 行代码。一个在主类，一个在另一个类。他们都在创建彼此的实例。

这些行是这样的:主类:

OnePlayerFrame OnePFrame = new OnePlayerFrame();

OnePlayerFrame 类:

MainFrame MainClass = new MainFrame();

我希望你能理解我在说什么，正如我所说的，我对 swing 很陌生。

谢谢-马特

好的，这就是全部内容:对了，忘了说了，我可能删除了一行简单的代码而忽略了它，所以如果是简单的事情请保持冷静:)

主类:

package rockpaperscissors;

import java.awt.Color;
import java.awt.Dimension;
import java.awt.Font;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.ImageIcon;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JTextField;

public class MainFrame {

public JFrame frame = new JFrame();

private final ImageIcon rock = new ImageIcon("C:/Users/Matthew/Documents/NetBeansProjects/RockPaperScissors/src/assets/rock.jpg");
private final ImageIcon paper = new ImageIcon("C:/Users/Matthew/Documents/NetBeansProjects/RockPaperScissors/src/assets/paper.png");
private final ImageIcon scissors = new ImageIcon("C:/Users/Matthew/Documents/NetBeansProjects/RockPaperScissors/src/assets/scissors.png");

private final JLabel rockLabel = new JLabel();
private final JLabel paperLabel = new JLabel();
private final JLabel scissorsLabel = new JLabel();

private final JPanel panel1 = new JPanel();
private final JPanel panel2 = new JPanel();
private final JPanel panel3 = new JPanel();
private final JPanel empty1 = new JPanel();
private final JPanel empty2 = new JPanel();
private final JPanel empty3 = new JPanel();
private final JPanel empty4 = new JPanel();
private final JPanel empty5 = new JPanel();

OnePlayerFrame OnePlayerFrame = new OnePlayerFrame();

public JButton btn1 = new JButton("1 Player");

private final JTextField text = new JTextField();

private final Font font = new Font("Showcard Gothic Regular", Font.BOLD, 28);


public MainFrame(){

    frame.setSize(360, 300);
    frame.setAlwaysOnTop(false);
    frame.setResizable(false);
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    frame.setLocationRelativeTo(null);
    frame.setVisible(true);
    frame.add(panel1);
    frame.add(panel2);
    frame.add(panel3);
    frame.setLayout(new GridLayout(3, 1));

    panel1.setLayout(new GridLayout(1, 3));
    panel1.add(rockLabel);
    panel1.add(paperLabel);
    panel1.add(scissorsLabel);
    panel1.setBackground(Color.WHITE);

    panel2.setLayout(new GridLayout(2, 3));
    panel2.add(empty1);
    panel2.add(empty2);
    panel2.add(empty3);
    panel2.add(empty4);
    panel2.add(btn1);
    panel2.add(empty5);

    panel3.add(text);
    panel3.setBackground(Color.WHITE);

    empty1.setBackground(Color.WHITE);
    empty2.setBackground(Color.WHITE);
    empty3.setBackground(Color.WHITE);
    empty4.setBackground(Color.WHITE);
    empty5.setBackground(Color.WHITE);

    text.setText("Rock Paper Scissors");
    text.setFont(font);
    text.setPreferredSize(new Dimension(360, 80));
    text.setEditable(false);
    text.setBorder(null);
    text.setHorizontalAlignment(JTextField.CENTER);
    text.setBackground(Color.WHITE);

    rockLabel.setIcon(rock);
    paperLabel.setIcon(paper);
    scissorsLabel.setIcon(scissors);

    btn1.setFocusPainted(false);

    btn1.addActionListener(new ActionListener() {
        public void actionPerformed(ActionEvent ae) {
            frame.dispose();
            OnePlayerFrame.startGame1();
        }
    });
}

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

这是第二堂课:

package rockpaperscissors;

import java.awt.Color;
import java.awt.Font;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.ImageIcon;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JTextField;

public class OnePlayerFrame {

MainFrame MainClass = new MainFrame();

JFrame gameFrame = new JFrame();

JPanel panel1 = new JPanel();
JPanel panel2 = new JPanel();
JPanel panel3 = new JPanel();
JPanel panel4 = new JPanel();
JPanel panel5 = new JPanel();
JPanel panel6 = new JPanel();
JPanel panel7 = new JPanel();
JPanel panel8 = new JPanel();
JPanel panel9 = new JPanel();
JPanel empty1 = new JPanel();
JPanel empty2 = new JPanel();

JTextField playerText1 = new JTextField();
JTextField playerText2 = new JTextField();
JTextField playerText3 = new JTextField();
JTextField compText1 = new JTextField();
JTextField compText2 = new JTextField();
JTextField compText3 = new JTextField();
JTextField pChoose = new JTextField();
JTextField cChoose = new JTextField();

JButton btn1 = new JButton("Rock");
JButton btn2 = new JButton("Paper");
JButton btn3 = new JButton("Scissors");
JButton btn4 = new JButton("Confirm");
JButton btn5 = new JButton("Fight!");
JButton getB = new JButton();

JLabel label1 = new JLabel();
JLabel label2 = new JLabel();

boolean confirmed = false;
boolean hasSelected = false;
boolean runThread = true;



String playerMove;



ImageIcon playerIcon = new ImageIcon("C:/Users/Matthew/Documents/NetBeansProjects/RockPaperScissors/src/assets/question-mark.jpg");
ImageIcon computerIcon = new ImageIcon("C:/Users/Matthew/Documents/NetBeansProjects/RockPaperScissors/src/assets/question-mark.jpg");

Font font = new Font("Showcard Gothic Regular", Font.BOLD, 18);

public OnePlayerFrame(){

    gameFrame.setVisible(true);
    gameFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    gameFrame.setSize(500, 400);
    gameFrame.setLocationRelativeTo(MainClass.frame);
    gameFrame.setLayout(new GridLayout(3, 1));
    gameFrame.add(panel1);
    gameFrame.add(panel2);
    gameFrame.add(panel3);
    MainClass.frame.dispose();



    panel1.setBackground(Color.WHITE);
    panel1.setLayout(new GridLayout(1, 4));
    panel1.add(panel4);
    panel1.add(panel5);
    panel1.add(panel6);
    panel1.add(panel7);

    panel2.setBackground(Color.WHITE);
    panel2.setLayout(new GridLayout(3, 1));
    panel2.add(pChoose);
    panel2.add(panel8);
    panel2.add(btn4);

    panel3.setBackground(Color.WHITE);
    panel3.add(cChoose);
    panel3.add(panel9);
    panel3.setLayout(new GridLayout(2, 1));

    panel4.setBackground(Color.WHITE);
    panel4.add(playerText1);
    panel4.add(playerText2);
    panel4.add(playerText3);
    panel4.setLayout(new GridLayout(3, 1));

    panel5.setBackground(Color.WHITE);
    panel5.add(label1);

    panel6.setBackground(Color.WHITE);
    panel6.add(label2);

    panel7.setBackground(Color.WHITE);
    panel7.add(compText1);
    panel7.add(compText2);
    panel7.add(compText3);
    panel7.setLayout(new GridLayout(3, 1));

    panel8.setLayout(new GridLayout(1, 3));
    panel8.add(btn1);
    panel8.add(btn2);
    panel8.add(btn3);

    panel9.setLayout(new GridLayout(1, 3));
    panel9.setBackground(Color.WHITE);
    panel9.add(empty1);
    panel9.add(btn5);
    panel9.add(empty2);



    empty1.setBackground(Color.WHITE);

    empty2.setBackground(Color.WHITE);



    playerText1.setEditable(false);
    playerText1.setBorder(null);
    playerText1.setText("Player");
    playerText1.setBackground(Color.WHITE);
    playerText1.setFont(font);
    playerText1.setHorizontalAlignment(JTextField.CENTER);

    playerText2.setEditable(false);
    playerText2.setBorder(null);
    playerText2.setText("Chose");
    playerText2.setBackground(Color.WHITE);
    playerText2.setFont(font);
    playerText2.setHorizontalAlignment(JTextField.CENTER);

    playerText3.setEditable(false);
    playerText3.setBorder(null);
    playerText3.setText("====>");
    playerText3.setBackground(Color.WHITE);
    playerText3.setFont(font);
    playerText3.setHorizontalAlignment(JTextField.CENTER);

    compText1.setEditable(false);
    compText1.setBorder(null);
    compText1.setText("Computer");
    compText1.setBackground(Color.WHITE);
    compText1.setFont(font);
    compText1.setHorizontalAlignment(JTextField.CENTER);

    compText2.setEditable(false);
    compText2.setBorder(null);
    compText2.setText("Chose");
    compText2.setBackground(Color.WHITE);
    compText2.setFont(font);
    compText2.setHorizontalAlignment(JTextField.CENTER);

    compText3.setEditable(false);
    compText3.setBorder(null);
    compText3.setText("<====");
    compText3.setBackground(Color.WHITE);
    compText3.setFont(font);
    compText3.setHorizontalAlignment(JTextField.CENTER);

    pChoose.setEditable(false);
    pChoose.setBorder(null);
    pChoose.setText("Choose your move");
    pChoose.setFont(font);
    pChoose.setHorizontalAlignment(JTextField.CENTER);
    pChoose.setBackground(Color.WHITE);

    cChoose.setEditable(false);
    cChoose.setBorder(null);
    cChoose.setText("Computer is choosing");
    cChoose.setFont(font);
    cChoose.setHorizontalAlignment(JTextField.CENTER);
    cChoose.setBackground(Color.WHITE);



    btn1.setRolloverEnabled(true);
    btn1.setFocusPainted(false);

    btn2.setFocusPainted(false);
    btn2.setRolloverEnabled(true);

    btn3.setFocusPainted(false);
    btn3.setRolloverEnabled(true);

    btn4.setFocusPainted(false);
    btn4.setRolloverEnabled(true);

    btn5.setFocusPainted(false);
    btn5.setRolloverEnabled(true);
    btn5.setVisible(false);
    btn5.setFont(font);



    label1.setIcon(playerIcon);

    label2.setIcon(computerIcon);
}

public void startGame1(){

    new Thread(new Runnable() {
        public void run() {
            while(confirmed == true || confirmed == false){
                if(confirmed == false){
                    try{
                        if(confirmed == false){
                            cChoose.setText("Computer is choosing");
                            Thread.sleep(500);
                        }
                        if(confirmed == false){
                            cChoose.setText("Computer is choosing.");
                            Thread.sleep(500);
                        }
                        if(confirmed == false){
                            cChoose.setText("Computer is choosing..");
                            Thread.sleep(500);
                        }
                        if(confirmed == false){
                            cChoose.setText("Computer is choosing...");
                            Thread.sleep(500);
                        }
                    }
                    catch(Exception e){
                        gameFrame.dispose();
                    }
                }
                if(confirmed == true){
                    cChoose.setText("Computer has chosen!");
                    fightButtonSet();
                }
            }
        }
    }).start();


    btn1.addActionListener(new ActionListener() {
        public void actionPerformed(ActionEvent ae) {
            if(confirmed == false){
                playerMove = btn1.getText();
                hasSelected = true;
                pChoose.setText("You have selected rock");
                getB = btn1;
            }
            else{
                pChoose.setText("You have already confirmed " + getB.getText().toLowerCase() + "!");
            }
        }
    });

    btn2.addActionListener(new ActionListener() {
        public void actionPerformed(ActionEvent ae) {
            if(confirmed == false){
                playerMove = btn2.getText();
                hasSelected = true;
                pChoose.setText("You have selected paper");
                getB = btn2;
            }
            else{
                pChoose.setText("You have already confirmed " + getB.getText().toLowerCase() + "!");
            }
        }
    });

    btn3.addActionListener(new ActionListener() {
        public void actionPerformed(ActionEvent ae) {
            if(confirmed == false){
                playerMove = btn3.getText();
                hasSelected = true;
                pChoose.setText("You have selected scissors");
                getB = btn3;
            }
            else{
                pChoose.setText("You have already confirmed " + getB.getText().toLowerCase() + "!");
            }
        }
    });

    btn4.addActionListener(new ActionListener() {
        public void actionPerformed(ActionEvent ae) {
            if(hasSelected == true && confirmed == false){
                confirmed = true;
                pChoose.setText("You have confirmed " + getB.getText().toLowerCase() + "!");
                cChoose.setText("Computer has chosen!");

            }
            else{
                if(hasSelected == false){
                    pChoose.setText("You haven't selected anything yet!");
                }
                else if (confirmed == true){
                    pChoose.setText("You have already confirmed " + getB.getText().toLowerCase() + "!");
                }
            }
        }
    });
}

public void fightButtonSet(){

    btn5.setVisible(true);
    btn5.addActionListener(new ActionListener() {
        public void actionPerformed(ActionEvent ae) {
            FIGHT();
        }
    });
}

public void FIGHT(){
    if(getB.getText().equalsIgnoreCase("Rock")){

    }
    if(getB.getText().equalsIgnoreCase("Paper")){

    }
    if(getB.getText().equalsIgnoreCase("Scissors")){

    }
}



}

Answer 1

我们可以抽象一点你有这个。

public class TestCircularDependency {

    static class A{

        B b = new B();

        }

        static class B{

        A a = new A();

        }

        public static void main(String args[]){

            A a = new A();

        }

}

这将抛出一个StackOverflowError。你有一个循环依赖。问题是你在构造函数中实例化每个实例，然后你就有无限递归。

在java中你可以有循环依赖，但在对象创建中不能。你可以做这样的事情。

public class TestCircularDependency {

    static class A{

        B b;

        }

        static class B{

        A a;

        }

        public static void main(String args[]){

            A a = new A();
            a.b = new B();
            b.a= a;
        }

}