JAVA SWING 下拉列表

最新推荐文章于 2023-12-08 19:18:06 发布

原创最新推荐文章于 2023-12-08 19:18:06 发布 · 5.3k 阅读

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#swing #java #string #exception #import #object

本文介绍如何使用Java编程语言实现一个带有提示功能的组合框组件，通过自定义渲染器来实现在不同的选择项上显示不同提示信息。

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import java.awt.Component;import java.awt.FlowLayout;import java.awt.event.WindowAdapter;import java.awt.event.WindowEvent;import javax.swing.JComboBox;import javax.swing.JFrame;import javax.swing.JList;import javax.swing.UIManager;import javax.swing.plaf.basic.BasicComboBoxRenderer;public class ToolTipComboBoxExample extends JFrame { String[] items = { "jw", "ja", "la" }; String[] tooltips = { "Javanese ", "Japanese ", "Latin " }; public ToolTipComboBoxExample() { super("ToolTip ComboBox Example"); JComboBox combo = new JComboBox(items); combo.setRenderer(new MyComboBoxRenderer()); getContentPane().setLayout(new FlowLayout()); getContentPane().add(combo); } class MyComboBoxRenderer extends BasicComboBoxRenderer { public Component getListCellRendererComponent(JList list, Object value, int index, boolean isSelected, boolean cellHasFocus) { if (isSelected) { setBackground(list.getSelectionBackground()); setForeground(list.getSelectionForeground()); if (-1 < index) { list.setToolTipText(tooltips[index]); } } else { setBackground(list.getBackground()); setForeground(list.getForeground()); } setFont(list.getFont()); setText((value == null) ? "" : value.toString()); return this; } } public static void main(String args[]) { try { UIManager.setLookAndFeel("com.sun.java.swing.plaf.windows.WindowsLookAndFeel"); } catch (Exception evt) {} ToolTipComboBoxExample frame = new ToolTipComboBoxExample(); frame.addWindowListener(new WindowAdapter() { public void windowClosing(WindowEvent e) { System.exit(0); } }); frame.setSize(200, 140); frame.setVisible(true); }}