JPanel неправильно определяет размеры в JFrame;используя GridBagConstraints

Question

Я пытаюсь создать графический интерфейс, который запускает игру в угадайку, но застрял с помощью GridBagLayout. Проблема с размером JPanel в моем JFrame.

Я уже написал аналогичную программу, которая прекрасно работает, и не понимаю, почему одна работает, а другая - нет.

import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.*;
import java.util.*;

public class GuessGame {

    private static JTextField inputBox;

    GuessGame(){}
    public static void main(String[] args) {
        createWindow();
    }

    private static void createWindow() {          
          JFrame frame = new JFrame("GuessingGame");
          frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

          createUI(frame);
          frame.setSize(600, 600);            
          frame.setLocationRelativeTo(null);
          frame.setVisible(true);
       }

    private static void createUI(JFrame frame) {
        JPanel panel = new JPanel();

        GridBagLayout layout = new GridBagLayout();
        panel.setLayout(layout);

        GuessGame guessingGame = new GuessGame();

        GridBagConstraints gbc = new GridBagConstraints();

        inputBox = new JTextField(10);
        inputBox.setEditable(false);

        JLabel title = new JLabel("FUN FUN Guessing Game");
        JLabel entryBoxLabel = new JLabel("Entry Box: ");
        JLabel statsOptions = new JLabel("Statistics Options");
        JLabel message = new JLabel("HAVE FUN!!!");

        JButton startGame = new JButton("START");
        JButton clearDisplay = new JButton("CLEAR");
        JButton displayStats = new JButton("STATS");

        JCheckBox bestTime = new JCheckBox("Best Time");
        JCheckBox bestPlays = new JCheckBox("Best # of Plays");
        JCheckBox bestPlayer = new JCheckBox("Best Player");

        JTextArea displayArea = new JTextArea(300, 300);
        JScrollPane scrollWrap = new JScrollPane(displayArea);

        gbc.anchor = GridBagConstraints.ABOVE_BASELINE;
        gbc.gridx = 0; gbc.gridy = 0; panel.add(title, gbc);

        gbc.fill = GridBagConstraints.HORIZONTAL;
        gbc.gridx = 0; gbc.gridy = 1; panel.add(startGame, gbc);
        gbc.fill = GridBagConstraints.WEST;
        gbc.gridx = 1; gbc.gridy = 1; panel.add(entryBoxLabel, gbc);
        gbc.fill = GridBagConstraints.LINE_END;
        gbc.gridx = 1; gbc.gridy = 1; panel.add(inputBox, gbc);

        gbc.fill = GridBagConstraints.NONE;
        gbc.gridx = 0; gbc.gridy = 2; panel.add(displayArea, gbc);
        gbc.gridx = 1; gbc.gridy = 2; panel.add(scrollWrap, gbc);

        gbc.fill = GridBagConstraints.HORIZONTAL;
        gbc.gridx = 0; gbc.gridy = 3; panel.add(clearDisplay, gbc);

        gbc.anchor = GridBagConstraints.NORTH;
        gbc.gridx = 1; gbc.gridy = 3; panel.add(statsOptions, gbc);
        gbc.anchor = GridBagConstraints.SOUTHWEST;
        gbc.gridx = 1; gbc.gridy = 3; panel.add(bestTime, gbc);
        gbc.anchor = GridBagConstraints.SOUTH;
        gbc.gridx = 1; gbc.gridy = 3; panel.add(bestPlays, gbc);
        gbc.anchor = GridBagConstraints.SOUTHEAST;
        gbc.gridx = 1; gbc.gridy = 3; panel.add(bestPlayer, gbc);

        gbc.fill = GridBagConstraints.HORIZONTAL;
        gbc.gridx = 0; gbc.gridy = 4; panel.add(displayStats, gbc);
        gbc.gridx = 1; gbc.gridy = 4; panel.add(message, gbc);

        frame.getContentPane().add(panel, BorderLayout.CENTER);
    }

}

Я ожидал что-то похожее на это:

! https://imgur.com/20HVSxR

Но вот что я получил:

! https://imgur.com/AnMJtt7

HALP

Answer 1

Не стоит использовать GridBad, я предпочитаю использовать BoxLayout. Вот мой подход к вашей проблеме. Это самое близкое к изображению, которое вы разместили, используя Swing.

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

public class Test {

  public static void main(String[] args){
    SwingUtilities.invokeLater(new Runnable() {
      @Override
      public void run() { 
        createAndShowGUI();
      }
    });
  }

  private static void createAndShowGUI() {
    JFrame frame = new JFrame();
    JPanel north = createNorthPanel();
    JPanel center = createCenterPanel();
    JPanel south = createSouthPanel();

    frame.add(north, BorderLayout.NORTH);
    frame.add(center, BorderLayout.CENTER);
    frame.add(south, BorderLayout.SOUTH);

    frame.setLocationByPlatform(true);
    frame.pack();
    frame.setVisible(true);
  }

  private static JPanel createNorthPanel() {
    JPanel northPanel = new JPanel();
    BoxLayout northPanelLayout = new BoxLayout(northPanel, BoxLayout.Y_AXIS);
    northPanel.setLayout(northPanelLayout);

    JPanel upperPanel = new JPanel();
    JLabel funFunGuessingGameLabel = new JLabel("FUN FUN Guessing Game");
    funFunGuessingGameLabel.setFont(funFunGuessingGameLabel.getFont().deriveFont(Font.ITALIC));
    upperPanel.add(funFunGuessingGameLabel);
    upperPanel.setBorder(BorderFactory.createLineBorder(Color.BLACK, 1));

    JPanel lowerPanel = new JPanel();
    BoxLayout lowerPanelLayout = new BoxLayout(lowerPanel, BoxLayout.X_AXIS);
    lowerPanel.setLayout(lowerPanelLayout);

    JButton startButton = new JButton("START");
    startButton.setPreferredSize(new Dimension(175,(int)startButton.getPreferredSize().getHeight()));
    JLabel entryBoxLabel = new JLabel("Entry Box: ");
    JTextField entryBoxTextField = new JTextField();

    lowerPanel.add(startButton);
    lowerPanel.add(Box.createHorizontalStrut(10));
    lowerPanel.add(entryBoxLabel);
    lowerPanel.add(entryBoxTextField);
    lowerPanel.setBorder(BorderFactory.createLineBorder(Color.BLACK, 1));

    northPanel.add(upperPanel);
    northPanel.add(lowerPanel);
    return northPanel;
  }

  private static JPanel createCenterPanel() {
    JPanel centerPanel = new JPanel();
    BoxLayout centerPanelLayout = new BoxLayout(centerPanel, BoxLayout.Y_AXIS);
    centerPanel.setLayout(centerPanelLayout);

    JLabel l1 = new JLabel("Guesses and statistics are shown in this display as a scrollable list, e.g.:                  ");
    JLabel l2 = new JLabel("(1,3,5)é(0,0)");
    JLabel l3 = new JLabel("(2,4,6)é(0,0)");
    JLabel l4 = new JLabel("(7,8,9)é(0,0)");
    Box space = Box.createVerticalBox();

    centerPanel.add(Box.createHorizontalStrut(10));
    centerPanel.add(l1);
    centerPanel.add(Box.createVerticalStrut(10));
    centerPanel.add(l2);
    centerPanel.add(Box.createVerticalStrut(5));
    centerPanel.add(l3);
    centerPanel.add(Box.createVerticalStrut(5));
    centerPanel.add(l4);
    centerPanel.add(Box.createVerticalStrut(40));
    centerPanel.setBorder(BorderFactory.createLineBorder(Color.BLACK, 1));

    return centerPanel;
  }


  private static JPanel createSouthPanel() {
    JPanel southPanel = new JPanel();
    BoxLayout southPanelLayout = new BoxLayout(southPanel, BoxLayout.Y_AXIS);
    southPanel.setLayout(southPanelLayout);

    JPanel upperPanel = new JPanel();
    BoxLayout upperPanelLayout = new BoxLayout(upperPanel, BoxLayout.X_AXIS);
    upperPanel.setLayout(upperPanelLayout);

    JPanel clearButtonPanel = new JPanel(new BorderLayout(0, 0));
    JButton clearButton = new JButton("CLEAR");
    clearButton.setPreferredSize(new Dimension(175, (int) clearButton.getPreferredSize().getHeight()));
    clearButtonPanel.add(clearButton);


    JPanel innerPanel = new JPanel();
    BoxLayout innerPanelLayout = new BoxLayout(innerPanel, BoxLayout.Y_AXIS);
    innerPanel.setLayout(innerPanelLayout);

    JPanel statisticsOptionsLabelPanel = new JPanel();
    JLabel statisticsOptionsLabel = new JLabel("Statistics Options");
    statisticsOptionsLabelPanel.add(statisticsOptionsLabel);

    JPanel checkBoxPanel = new JPanel();
    BoxLayout checkBoxPanelLayout = new BoxLayout(checkBoxPanel, BoxLayout.X_AXIS);
    checkBoxPanel.setLayout(checkBoxPanelLayout);

    JCheckBox bestTimeCheckBox = new JCheckBox("Best Time");
    JCheckBox bestNumOfPlaysCheckBox = new JCheckBox("Best  # of plays");
    JCheckBox topPlayerCheckBox = new JCheckBox("Top Player");

    checkBoxPanel.add(bestTimeCheckBox);
    checkBoxPanel.add(bestNumOfPlaysCheckBox);
    checkBoxPanel.add(topPlayerCheckBox);

    innerPanel.add(statisticsOptionsLabelPanel);
    upperPanel.add(Box.createVerticalGlue());
    innerPanel.add(checkBoxPanel);    

    upperPanel.add(clearButtonPanel);
    upperPanel.add(Box.createHorizontalStrut(14));
    upperPanel.add(innerPanel);
    upperPanel.setBorder(BorderFactory.createLineBorder(Color.BLACK, 1));

    JPanel lowerPanel = new JPanel();
    BoxLayout lowerPanelLayout = new BoxLayout(lowerPanel, BoxLayout.X_AXIS);
    lowerPanel.setLayout(lowerPanelLayout);

    JButton statsButton = new JButton("STATS");
    statsButton.setPreferredSize(new Dimension(175,(int)statsButton.getPreferredSize().getHeight()));
    JLabel haveFunLabel = new JLabel("Have Fun!!!");

    lowerPanel.add(statsButton);
    lowerPanel.add(Box.createHorizontalGlue());
    lowerPanel.add(haveFunLabel);
    lowerPanel.add(Box.createHorizontalGlue());
    lowerPanel.setBorder(BorderFactory.createLineBorder(Color.BLACK, 1));

    southPanel.add(upperPanel);
    southPanel.add(lowerPanel);
    return southPanel;
  }
}