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想要在 JTextArea 上显示 JList

发布于 2024-10-31 06:01:55 字数 303 浏览 3 评论 0原文

我想在 JTextArea 上显示 JList，但它显示在 JTextArea 后面。我附上了两张图片来通过图像来描述我的问题。在运行时我们如何在 JTextArea 上设置 JList？

JTextArea 后面的 JList：

在此处输入图像描述

JTextArea 上的 JList：

在此处输入图像描述

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地狱即天堂 2024-11-07 06:01:55

bsm：在这种情况下，您不应该使用 JList，而应该使用 JComboBoxes，它的下拉列表可以在 JTextArea 上正确显示。例如，

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

public class JComboAndJTextArea extends JPanel {

   private static final String[] ITEMS1 = {"one", "two", "three", "four", "five"};
   private static final String[] ITEMS2 = {"Monday", "Tuesday", 
      "Wednesday", "Thursday", "Friday"};

   public JComboAndJTextArea() {
      JPanel northPanel = new JPanel();
      northPanel.add(new JCheckBox("Reminder"));
      northPanel.add(new JComboBox(ITEMS1));
      northPanel.add(new JComboBox(ITEMS2));

      setLayout(new BorderLayout());
      add(northPanel, BorderLayout.NORTH);
      add(new JScrollPane(new JTextArea(8, 30)), BorderLayout.CENTER);

   }

   private static void createAndShowUI() {
      JFrame frame = new JFrame("JComboAndJTextArea");
      frame.getContentPane().add(new JComboAndJTextArea());
      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();
         }
      });
   }
}

我还重新建议您暂时将 NetBeans 代码生成放在一边，因为我真诚地相信，对于许多人来说，这会阻碍他们学习如何在 Swing 中进行编码的能力。

bsm: you should not use JLists for this situation but JComboBoxes which will have drop down lists that display correctly over the JTextArea. For e.g.,

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

public class JComboAndJTextArea extends JPanel {

   private static final String[] ITEMS1 = {"one", "two", "three", "four", "five"};
   private static final String[] ITEMS2 = {"Monday", "Tuesday", 
      "Wednesday", "Thursday", "Friday"};

   public JComboAndJTextArea() {
      JPanel northPanel = new JPanel();
      northPanel.add(new JCheckBox("Reminder"));
      northPanel.add(new JComboBox(ITEMS1));
      northPanel.add(new JComboBox(ITEMS2));

      setLayout(new BorderLayout());
      add(northPanel, BorderLayout.NORTH);
      add(new JScrollPane(new JTextArea(8, 30)), BorderLayout.CENTER);

   }

   private static void createAndShowUI() {
      JFrame frame = new JFrame("JComboAndJTextArea");
      frame.getContentPane().add(new JComboAndJTextArea());
      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();
         }
      });
   }
}

I also re-recommend that you put your NetBeans code generation to the side for the time being as I honestly believe that for many it hinders their ability to learn how to code in Swing.

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