Java gui布局

Question

如何在基于列的java中创建gui布局？我的意思是:

JLabel
JTextField
JLabel
JTextField
JLabel
JTextField

我希望他们彼此堆叠在一起,而不是并排.在过去,我使用过不适合的FlowLayout和gridLayout,它使每个组件比我要求的要大得多.有任何想法吗？

Answer 1

查看BoxLayout,但更重要的是,浏览布局管理器教程以获得所有用户友好布局管理器的概述.

编辑1:
此外,GridLayout有时在这种情况下运行良好,但您可能希望将JTextField放在JPanels中并将JPanels添加到网格中,以便JTextFields看起来不是很大.

编辑2:
如果你有一堆带有相关JLabel的JTextFields,我已经成功并且从表示JLabel文本的String数组开始工作,然后将JTextField放入一个Map<String, JTextField>以便我可以轻松获得对它的引用JTextField基于它的相关String.跟随的例子......

按照承诺编辑3,示例:

import java.awt.*;
import java.awt.event.*;
import java.util.HashMap;
import java.util.Map;
import javax.swing.*;

@SuppressWarnings("serial")
public class LabelsAndFields {
   public static final String[] LABEL_TEXTS = {
      "Sunday", "Monday", "Tuesday",
      "Wednesday", "Thursday", "Friday", "Saturday"};

   private JPanel mainPanel = new JPanel();
   private static final int FIELD_COLS = 10;
   private Map<String, JTextField> textFieldMap = new HashMap<String, JTextField>();

   public LabelsAndFields() {
      mainPanel.setLayout(new BoxLayout(mainPanel, BoxLayout.PAGE_AXIS));
      for (String labelText : LABEL_TEXTS) {
         JTextField textField = new JTextField(FIELD_COLS);
         textFieldMap.put(labelText, textField);
         JPanel panel = new JPanel(new BorderLayout());
         panel.add(new JLabel(labelText), BorderLayout.NORTH);
         panel.add(textField);
         int gap = 8;
         panel.setBorder(BorderFactory.createEmptyBorder(gap, gap, gap, gap));
         mainPanel.add(panel);
      }
   }

   public String getText(String labelTextKey) {
      JTextField field = textFieldMap.get(labelTextKey);
      if (field == null) {
         throw new IllegalArgumentException(labelTextKey + "is not a valid textFieldMap Key");
      }

      return field.getText();
   }

   public void setText(String labelTextKey, String text) {
      JTextField field = textFieldMap.get(labelTextKey);
      if (field == null) {
         throw new IllegalArgumentException(labelTextKey + "is not a valid textFieldMap Key");
      }

      field.setText(text);
   }

   public JPanel getMainPanel() {
      return mainPanel;
   }

   private static void createAndShowUI() {
      final LabelsAndFields labelsAndFields = new LabelsAndFields();

      JButton showAllTextBtn = new JButton(new AbstractAction("Show All Text") {
         @Override
         public void actionPerformed(ActionEvent arg0) {
            for (String labelText : LabelsAndFields.LABEL_TEXTS) {
               System.out.printf("%10s: %s%n", labelText, labelsAndFields.getText(labelText));
            }
         }
      });

      JFrame frame = new JFrame("LabelsAndFields");
      frame.getContentPane().add(labelsAndFields.getMainPanel(), BorderLayout.CENTER);
      frame.getContentPane().add(showAllTextBtn, BorderLayout.SOUTH);
      frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
      frame.pack();
      frame.setLocationRelativeTo(null);
      frame.setVisible(true);
   }

   public static void main(String[] args) {
      java.awt.EventQueue.invokeLater(new Runnable() {
         public void run() {
            createAndShowUI();
         }
      });
   }
}