java - 对非静态 JFrame 进行静态引用？

Question

我正在尝试将基于终端的猜谜游戏变成基于 GUI 的游戏。我的问题是，当我将所有代码放入 main 方法中时，总是会出现问题。

我想我应该最后编写 main 方法，这是使 GUI 可见的唯一工作，但我无法对非静态 JFrame 变量 frame 进行静态引用。我对 Java 和一般编程都很陌生，此时我只是不知所措。

代码

public class GuiGuess extends JPanel implements ActionListener{
    JTextField guessField = new JTextField("Your Guess");
    JTextField minField = new JTextField ("Minimum Boundary");
    JTextField maxField = new JTextField ("Maximum Boundary");
    JTextArea outputArea;
    JButton checkButton;
    JFrame frame = new JFrame("Guessing Game");

    public GuiGuess(){
        JFrame frame = new JFrame("Guessing Game");

        JPanel textHolder = new JPanel();
        JPanel buttonHolder = new JPanel();

        textHolder.add(minField);
        textHolder.add(maxField);
        textHolder.add(guessField);
        textHolder.add(outputArea);

        buttonHolder.add(checkButton);

        frame.getContentPane().add(textHolder, "North");
        frame.getContentPane().add(buttonHolder, "South");
        frame.setVisible(true);

        checkButton.addActionListener(this);
    }


    int numGuesses = 0;
    int counter = 0;
    int guess = Integer.parseInt(guessField.getText());
        public void actionPerformed(ActionEvent e){
            if (counter < 1){
            int min = Integer.parseInt(minField.getText());
            int max = Integer.parseInt(maxField.getText());
            int numToGuess = min + (int)(Math.random()*max);
            }
            guess = Integer.parseInt(guessField.getText());
            numGuesses++;
            counter++;
            if (guess < numToGuess){
                outputArea.setText("Your guess is too low");
            }
            else if (guess > numToGuess){
                outputArea.setText("Your guess is too high");
            }
                else if (guess == numToGuess){
                    outputArea.setText("You Win! It took you "+numGuesses +"Tries!");
                }

                }

public static void main(String Args[]){
    frame.setVisible(true);

}

}

Answer 1

错误的选择:使frame静态。

更好:在 GuiGuess 中创建一个方法:

public void show() {
    frame.setVisible(true);
}

并在您的main中:

 GuiGuess gGuess = new GuiGuess();
 gGuess.show();

因为frame是GuiGuess类的成员变量，因此改变它的状态应该经过GuiGuess。