Java 2 JPanel在一个JFrame布局中

5 回答

• 3

  这是这样做的方法：

  import java.awt.*;
  import javax.swing.*;
  
  public class GridBagLayoutTest
  {
      public GridBagLayoutTest()
      {
          JFrame frame = new JFrame("GridBag Layout Test");
          frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
          frame.setLocationByPlatform(true);
  
          Container container = frame.getContentPane();
          container.setLayout(new GridBagLayout());
  
          JPanel leftPanel = new JPanel();
          leftPanel.setBackground(Color.WHITE);
          GridBagConstraints gbc = new GridBagConstraints();
          gbc.gridx = 0;
          gbc.gridy = 0;
          gbc.weightx = 0.5;
          gbc.weighty = 1.0;
          gbc.anchor = GridBagConstraints.FIRST_LINE_START;
          gbc.fill = GridBagConstraints.BOTH;
  
          container.add(leftPanel, gbc);
  
          JPanel rightPanel = new JPanel();
          rightPanel.setBackground(Color.BLUE);
          gbc = new GridBagConstraints();
          gbc.gridx = 1;
          gbc.gridy = 0;
          gbc.weightx = 0.5;
          gbc.weighty = 1.0;
          gbc.anchor = GridBagConstraints.FIRST_LINE_END;
          gbc.fill = GridBagConstraints.BOTH;
  
          container.add(rightPanel, gbc);
  
          frame.setSize(600, 400);
          frame.setVisible(true);
      }
  
      public static void main(String... args)
      {
          Runnable runnable = new Runnable()
          {
              public void run()
              {
                  new GridBagLayoutTest();
              }
          };
          SwingUtilities.invokeLater(runnable);
      }
  }
  

  输出：

  

  回复于 2024-05-07T10:21:03+08:00
• 2

  对于GridBaglayout你必须设置

  • 填

  • 锚

  • weightx和重量

  • gridx / gridy（取决于方向）

  那么例如是可能的

  import java.awt.*;
  import javax.swing.*;
  import javax.swing.border.*;
  
  public class BorderPanels extends JFrame {
  
      private static final long serialVersionUID = 1L;
  
      public BorderPanels() {
          setLayout(new GridBagLayout());// set LayoutManager
          GridBagConstraints gbc = new GridBagConstraints();
          JPanel panel1 = new JPanel();
          Border eBorder = BorderFactory.createEtchedBorder();
  
          panel1.setBorder(BorderFactory.createTitledBorder(eBorder, "20pct"));
          gbc.gridx = gbc.gridy = 0;
          gbc.gridwidth = gbc.gridheight = 1;
          gbc.fill = GridBagConstraints.BOTH;
          gbc.anchor = GridBagConstraints.NORTHWEST;
          gbc.weightx = gbc.weighty = 20;
          add(panel1, gbc); // add compoenet to the COntentPane
  
          JPanel panel2 = new JPanel();
          panel2.setBorder(BorderFactory.createTitledBorder(eBorder, "60pct"));
          gbc.gridy = 1;
          gbc.weightx = gbc.weighty = 60;
          //gbc.insets = new Insets(2, 2, 2, 2);
          add(panel2, gbc); // add component to the COntentPane
  
          JPanel panel3 = new JPanel();
          panel3.setBorder(BorderFactory.createTitledBorder(eBorder, "20pct"));
          gbc.gridy = 2;
          gbc.weightx = gbc.weighty = 20;
          gbc.insets = new Insets(2, 2, 2, 2);
          add(panel3, gbc);
  
          setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); // important
          pack();
          setVisible(true); // important
      }
  
      public static void main(String[] args) {
          javax.swing.SwingUtilities.invokeLater(new Runnable() { // important
  
              public void run() {
                  BorderPanels borderPanels = new BorderPanels();
              }
          });
      }
  }
  

  在大多数情况下将更好地使用另一个 LayoutManager

  回复于 2024-05-07T10:21:03+08:00
• 0

  JFrame tradeframe = new JFrame("Trade");
      JPanel P1panel = new JPanel();         
      P1panel.setBackground(Color.red);
      JPanel P2panel = new JPanel();
      P2panel.setBackground(Color.BLACK);
      tradeframe.setSize(600, 400);
      tradeframe.setResizable(false);
      tradeframe.setLocationRelativeTo(null);
  
      Box content = new Box(BoxLayout.X_AXIS);
  
      P1panel.add(new JButton ("P1 Agree"));
  
      P2panel.add(new JButton ("P2 Agree"));
  
      content.add(P1panel);
      content.add(P2panel);
  
      tradeframe.setContentPane(content);
      tradeframe.setVisible(true);
  

  回复于 2024-05-07T10:21:03+08:00
• 2

  在面板对象上调用 setPreferredSize(new Dimension(int width, int height)); 方法 .

  回复于 2024-05-07T10:21:03+08:00
• 4

  您正在使用 setSize() 而不是 setPreferredSize() . 差异有点误导，我认为这是java中的问题 . 关于两者之间的区别的更多信息可以找到here.

  我链接的文章有一些其他的陷阱/陷阱和一个有用的读取，如果你是Java的新手 .

  回复于 2024-05-07T10:21:03+08:00