为什么我的按钮占用了整个JFrame? [英] Why Are My Buttons Taking Up The Whole JFrame?

问题描述

我的代码以前工作正常，但是现在一个JButton占用了整个JFrame，我们将不胜感激！

My code was working before, but now one JButton takes up the entire JFrame, any help would be appreciated!

我正在使用一个名为fl的FlowLayout和一个名为Ken的类

I am using a FlowLayout called fl and a class called Ken

我有十个按钮(oneButton，twoButton，ThreeButton等.)

I have ten buttons called (oneButton, twoButton, threeButton, etc..)

我的代码:

import java.awt.ComponentOrientation;
import java.awt.Dimension;
import java.awt.FlowLayout;


import javax.swing.JButton;
import javax.swing.JFrame;



public class Ken {

public static void frame(){
    JFrame frame = new JFrame("Pow");
    frame.setSize(500, 600);
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    frame.setVisible(true);
    frame.setResizable(false);
    FlowLayout fl = new FlowLayout(0, 50, 40);


    JButton oneButton = new JButton("         1         ");
    oneButton.setPreferredSize(new Dimension(100, 90));
    frame.add(oneButton);
    JButton twoButton = new JButton("         2         ");
    twoButton.setPreferredSize(new Dimension(100, 90));
    frame.add(twoButton);
    JButton threeButton = new JButton("         3         ");
    threeButton.setPreferredSize(new Dimension(100, 90));
    frame.add(threeButton);
    JButton fourButton = new JButton("         4         ");
    fourButton.setPreferredSize(new Dimension(100, 90));
    frame.add(fourButton);
    JButton fiveButton = new JButton("         5         ");
    fiveButton.setPreferredSize(new Dimension(100, 90));
    frame.add(fiveButton);
    JButton sixButton = new JButton("          6         ");
    sixButton.setPreferredSize(new Dimension(100, 90));
    frame.add(sixButton);
    JButton sevenButton = new JButton("         7         ");
    sevenButton.setPreferredSize(new Dimension(100, 90));
    frame.add(sevenButton);
    JButton eightButton = new JButton("         8         ");
    eightButton.setPreferredSize(new Dimension(100, 90));
    frame.add(eightButton);
    JButton nineButton = new JButton("         9         ");
    nineButton.setPreferredSize(new Dimension(100, 90));
    frame.add(nineButton);
    JButton zeroButton = new JButton("                                                                       
                                  0                               ");
    zeroButton.setPreferredSize(new Dimension(400, 90));
    frame.add(zeroButton);
    frame.setComponentOrientation(
            ComponentOrientation.LEFT_TO_RIGHT);
}



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

有什么可以尝试的吗?

推荐答案

我正在使用一个名为fl的FlowLayout.

I am using a FlowLayout called fl ...

实际上您并未使用FlowLayout，因为您从未在容器上调用setLayout(...).相反，框架的contentPane使用contentPanes的默认布局BorderLayout，这将导致以默认方式添加的最后一个组件填充容器的BorderLayout.CENTER位置.

You are not in fact using FlowLayout as you never call setLayout(...) on a container. Instead your Frame's contentPane is using the default layout for contentPanes, BorderLayout, which will cause the last component added in a default way to fill up the container's BorderLayout.CENTER location.

一种解决方案是使用布局:

So one solution is to use your layout:

FlowLayout fl = new FlowLayout(0, 50, 40);    
frame.getContentPane().setLayout(fl);

但是，话虽如此，您最好不要设置组件的首选大小，而应使用嵌套容器的组合，每个容器都使用自己的布局，以实现令人愉悦且复杂的GUI，从而更容易实现保持和扩展.

But having said that, you will probably be better off not setting the preferred sizes of your components but instead using a combination of nested containers each using its own layout in order to achieve a pleasing and complex GUI that will be much easier to maintain and extend.

或者，您可以使用更复杂的布局，例如GridBagLayout.例如:

Alternatively, you could play with more complex layouts such as the GridBagLayout. For example:

import java.awt.Component;
import java.awt.Font;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.Insets;

import javax.swing.*;

public class Ken2 {
   private static final String[][] NUMBERS = {
      {"1", "2", "3"},
      {"4", "5", "6"},
      {"7", "8", "9"},
      {"0"}
   };
   private static final float BUTTON_FONT_PTS = 45f;
   private static final int INSETS = 20;
   private static final Insets BUTTON_INSETS = new Insets(INSETS, INSETS, 
           INSETS, INSETS);
   private static final int IPAD = 20;
   private JPanel mainPanel = new JPanel();

   public Ken2() {
      mainPanel.setLayout(new GridBagLayout());
      for (int row = 0; row < NUMBERS.length; row++) {
         addRowToPanel(row, NUMBERS[row]);
      }
   }

   private void addRowToPanel(int row, String[] numbersRow) {
      int columns = numbersRow.length;
      for (int col = 0; col < numbersRow.length; col++) {
         addNumberButton(row, col, columns, numbersRow[col]);
      }
   }

   private void addNumberButton(int row, int col, int columns, 
           String numberText) {
      JButton button = new JButton(numberText);
      button.setFont(button.getFont().deriveFont(Font.BOLD, BUTTON_FONT_PTS));
      GridBagConstraints gbc = new GridBagConstraints();
      gbc.gridx = col;
      gbc.gridy = row;
      gbc.gridheight = 1;
      gbc.gridwidth = 3 / columns;
      gbc.weightx = 1.0;
      gbc.weighty = 1.0;
      gbc.anchor = GridBagConstraints.CENTER;
      gbc.fill = GridBagConstraints.BOTH;
      gbc.insets = BUTTON_INSETS;
      gbc.ipadx = IPAD;
      gbc.ipady = IPAD;

      mainPanel.add(button, gbc);
   }

   private static void createAndShowGui() {
      Ken2 ken = new Ken2();

      JFrame frame = new JFrame("Ken2");
      frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
      frame.getContentPane().add(ken.getMainPanel());
      frame.pack();
      frame.setLocationByPlatform(true);
      frame.setVisible(true);
   }

   private Component getMainPanel() {
      return mainPanel;
   }

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

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