JFrame 中的所有组件均未显示

Posted 2023-02-21

【中文标题】JFrame 中的所有组件均未显示

【英文标题】：All Components on JFrame arent showing

【发布时间】：2015-07-10 15:01:23

【问题描述】：

我正在创建一个刽子手游戏，并希望框架上有 3 个不同的组件、绞刑架的图片、试图猜测的单词和字母的按钮，当我尝试将这些组件添加到 JFrame 上时被添加到我想要它们的地方，但是单词出现在左侧并且 HangmanGallows（扩展 JPanel）甚至没有显示，我如何让 HangmanGallows 和单词在绝对中心并排显示？

public void createGUI() 
    frame = new JFrame("Hangman");
    frame.setSize(500, 500);
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    frame.setVisible(true);
    selectedWord = new WordBank().getWord(); // initializes 'selectedWord' to a random word selected from WordBank class
    System.out.println(selectedWord);
    displayWord();
    displayCharacterChoices();
 // end method

public void displayWord() 
    String word = "";
    for (int i = 0; i < selectedWord.length(); i++) 
        word += "_  ";
     // end for loop
    HangmanGallows pic = new HangmanGallows();
    JLabel actualWord = new JLabel(word);
    actualWord.setFont(new Font(Font.DIALOG, Font.BOLD, 40));

    frame.getContentPane().add(BorderLayout.EAST, pic);
    frame.getContentPane().add(BorderLayout.CENTER, actualWord);
 // end method

public void displayCharacterChoices() 
    String[] array = "A", "B", "C", "D", "E", "F", "G", "H", "I", "J", "K", "L", "M", "N", "O", "P", "Q", "R", "S", "T", "U", "V", "W", "X", "Y", "Z";
    charactersPanel = new JPanel();
    CharacterButtonListener but = new CharacterButtonListener();
    JPanel panelOne = new JPanel();
    JPanel panelTwo = new JPanel();
    JButton temp;

    for (int i = 0; i < array.length / 2; i++) 
        temp = new JButton(array[i]);
        temp.addActionListener(but);
        temp.setText(array[i]);
        panelOne.add(temp);

     // end for loop
    for (int i = array.length / 2; i < array.length; i++) 
        temp = new JButton(array[i]);
        temp.addActionListener(but);
        temp.setText(array[i]);
        panelTwo.add(temp);
     // end for loop

    charactersPanel.setLayout(new BoxLayout(charactersPanel, BoxLayout.Y_AXIS));
    charactersPanel.add(panelOne);
    charactersPanel.add(panelTwo);
    frame.add(BorderLayout.SOUTH, charactersPanel);
 // end method    

【参考方案1】：

构建 UI 后致电 setVisible(true)

例如...

public void createGUI() 
    frame = new JFrame("Hangman");
    frame.setSize(500, 500);
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    //frame.setVisible(true);
    selectedWord = new WordBank().getWord(); // initializes 'selectedWord' to a random word selected from WordBank class
    System.out.println(selectedWord);
    displayWord();
    displayCharacterChoices();
    frame.setVisible(true);
 // end method

您还可以找到frame.pack 和frame.setLocationByPlatform(true) 的一些用途