Question

我想制作一个包含三个文本字段的GUI和一个使用Jlabel显示的结果，这些结果与文本字段垂直对齐。但是，我还想为此标签添加边框，以使边框的大小固定，并且与文本字段的大小相同。如果标签溢出边框，则没问题。它现在看起来像这样：GUI 我手动添加空格以保持空间，但是我仍然无法使标签与文本字段对齐相同的宽度，任何人都知道请帮助解决问题。

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class TestScorePanel extends JPanel{
  private JPanel p5, label_panel,text_panel;
  private JButton calculate_average;
  private JLabel length1_label, length2_label, length3_label,output_Label,result_Label;
  private JTextField length1, length2, length3; 

  public TestScorePanel(){
     length1_label = new JLabel("Enter length #1");
     length2_label = new JLabel("Enter length #2");
     length3_label = new JLabel("Enter length #3");
     output_Label = new JLabel("Average");
     result_Label = new JLabel("                      ");//spaces used to hold the space
     length1 = new JTextField(5);
     length2 = new JTextField(5);
     length3 = new JTextField(5);
     calculate_average = new JButton("Calculate Average");
     calculate_average.addActionListener(new ScoreListener());
     p5 = new JPanel();
     label_panel = new JPanel(); // left side labels 
     text_panel = new JPanel(); // right side labels
     label_panel.setLayout(new BoxLayout(label_panel, BoxLayout.Y_AXIS));//set vertical layout for panel
     text_panel.setLayout(new BoxLayout(text_panel, BoxLayout.Y_AXIS));
     setBorder(BorderFactory.createEmptyBorder(10,10,10,10));//set 

     result_Label.setBorder(BorderFactory.createLineBorder(Color.black));
     //setMinimumSize donesn's seem to work the way I wanted.
     result_Label.setMinimumSize(new Dimension(400,20));

     p5.setBorder(BorderFactory.createTitledBorder("Enter Three lengths"));
     p5.add(label_panel);
     p5.add(Box.createRigidArea(new Dimension (50,0)));
     p5.add(text_panel);
     add(p5);

     label_panel.add(length1_label);
     text_panel.add(length1);
     label_panel.add(Box.createRigidArea(new Dimension (0, 10)));
     text_panel.add(Box.createRigidArea(new Dimension (0, 10)));

     label_panel.add(length2_label);
     text_panel.add(length2);
     label_panel.add(Box.createRigidArea(new Dimension (0, 10)));
     text_panel.add(Box.createRigidArea(new Dimension (0, 10)));

     label_panel.add(length3_label);
     text_panel.add(length3);
     label_panel.add(Box.createRigidArea(new Dimension (0, 10)));
     text_panel.add(Box.createRigidArea(new Dimension (0, 10)));

     label_panel.add(output_Label);
     text_panel.add(result_Label);

     setLayout(new BoxLayout(this, BoxLayout.Y_AXIS));
     add(Box.createRigidArea(new Dimension (0, 10)));
     add(calculate_average);
     setPreferredSize(new Dimension(320,220));

  }


  private class ScoreListener implements ActionListener{
    public void actionPerformed(ActionEvent event){
      int len1, len2, len3, average;
      len1 = Integer.parseInt(length1.getText());
      len2 = Integer.parseInt(length2.getText());
      len3 = Integer.parseInt(length3.getText());
      average= (len1+ len2+ len3)/3;
      if (event.getSource() == calculate_average)
        result_Label.setText(Integer.toString(average));
    }
  }

}

Answer 1

考虑使用不同的布局管理器，它可以让您更好地控制组件的布局方式，例如GridBagLayout

nb：文本字段周围的填充是由MacOS提供的，在这种情况下，我考虑使用不可编辑的文本字段

setLayout(new GridBagLayout());
GridBagConstraints gbc = new GridBagConstraints();
gbc.gridx = 0;
gbc.gridy = 0;
gbc.anchor = GridBagConstraints.WEST;
add(new JLabel("Enter Length #1"), gbc);
gbc.gridy++;
add(new JLabel("Enter Length #2"), gbc);
gbc.gridy++;
add(new JLabel("Enter Length #3"), gbc);
gbc.gridy++;
add(new JLabel("Enter Length #4"), gbc);
gbc.gridy++;
add(new JLabel("Average"), gbc);

gbc.gridx++;
gbc.gridy = 0;
gbc.fill = GridBagConstraints.HORIZONTAL;
add(new JTextField(10), gbc);
gbc.gridy++;
add(new JTextField(10), gbc);
gbc.gridy++;
add(new JTextField(10), gbc);
gbc.gridy++;
add(new JTextField(10), gbc);
gbc.gridy++;
JLabel average = new JLabel(" ");
average.setBorder(BorderFactory.createLineBorder(Color.BLACK));
add(average, gbc);

Answer 2

设置结果字段的首选大小，如下所示

result_Label.setPreferredSize(length1.getPreferredSize());

具有固定边框的Java GUI Jlabel

2 个答案: