注释很详细，直接上代码
新增内容
1.为按钮指定图标
2. 列表框的并列
3.菜单项绑定快捷键
4.控件悬浮提示信息
5.菜单项设置小图标
6.五种布局风格右键选择切换
java
package swing21_30;
import javax.swing.*;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.InputEvent;
public class swing_test_25 {
JFrame frame = new JFrame("swing测试");
//定义一个按钮，并为其指定图标
Icon okIcon = new ImageIcon("img/ok.png");
JButton ok = new JButton("确定",okIcon);
//定义一个单选按钮，初始处于选中的状态
JRadioButton male = new JRadioButton("男",true);
//定义一个单选按钮，初始处于未选中状态
JRadioButton female = new JRadioButton("女",false);
//定义一个ButtonGroup，把male和female组合起来，实现单选
ButtonGroup buttonGroup = new ButtonGroup();
//定义一个复选框，初始处于没有选中状态
JCheckBox married = new JCheckBox("是否已婚？",false);
//定义一个数组存储颜色
String[] colors = { "红色", "绿色 " , "蓝色 " };
//定义一个下拉选择框，展示颜色
JComboBox<String> colorChooser = new JComboBox<String>(colors);
//定一个列表框，展示颜色
JList<String> colorList = new JList<String>(colors);
//定义一个8行20列的多行文本域
JTextArea textArea = new JTextArea(8,20);
//定义一个40列的单行文本域
JTextField name = new JTextField(40);
//定义菜单条
JMenuBar menuBar = new JMenuBar();
//定义菜单
JMenu file = new JMenu("文件");
JMenu edit = new JMenu("编辑");
//创建菜单项，并指定图标
JMenuItem newItem = new JMenuItem("新建",new ImageIcon("img/new.png"));
JMenuItem saveItem = new JMenuItem("保存",new ImageIcon("img/save.png"));
JMenuItem exitItem = new JMenuItem("退出",new ImageIcon("img/exit.png"));
JCheckBoxMenuItem autoWrap = new JCheckBoxMenuItem("自动换行");
JMenuItem copyItem = new JMenuItem("复制",new ImageIcon("img/copy.png"));
JMenuItem pasteItem = new JMenuItem("粘贴",new ImageIcon("img/paste.png"));
//定义二级菜单，将来会添加到编辑中
JMenu format = new JMenu("格式");
JMenuItem commentItem = new JMenuItem("注释");
JMenuItem cancelItem = new JMenuItem("取消注释");
//定义一个右键菜单，用于设置程序的外观风格
JPopupMenu pop = new JPopupMenu();
//定义一个ButtongGroup对象，用于组合风格按钮，形成单选
ButtonGroup flavorGroup = new ButtonGroup();
//定义五个单选按钮菜单项，用于设置程序风格
JRadioButtonMenuItem metalItem = new JRadioButtonMenuItem("Metal 风格",true);
JRadioButtonMenuItem nimbusItem = new JRadioButtonMenuItem("Nimbus 风格",true);
JRadioButtonMenuItem windowsItem = new JRadioButtonMenuItem("Windows 风格",true);
JRadioButtonMenuItem classicItem = new JRadioButtonMenuItem("Windows 经典风格",true);
JRadioButtonMenuItem motifItem = new JRadioButtonMenuItem("Motif 风格",true);
//初始化界面
public void init(){
//----------------------组合主区域------------------------
//创建一个装载文本框和按钮的JPanel
JPanel bottom = new JPanel();
bottom.add(name);
bottom.add(ok);
frame.add(bottom, BorderLayout.SOUTH);
//创建一个装载下拉选择框、三个JChekBox的JPanel
JPanel checkPanel = new JPanel();
checkPanel.add(colorChooser);
buttonGroup.add(male);
buttonGroup.add(female);
checkPanel.add(male);
checkPanel.add(female);
checkPanel.add(married);
//创建一个垂直排列的Box，装载checkPanel和多行文本域
Box topLeft = Box.createVerticalBox();
//使用JScrollPane作为普通组件的JViewPort
JScrollPane taJsp = new JScrollPane(textArea);
topLeft.add(taJsp);
topLeft.add(checkPanel);
//创建一个水平排列的Box，装载topLeft和colorList
Box top = Box.createHorizontalBox();
top.add(topLeft);
top.add(colorList);
//将top Box 添加到窗口的中间
frame.add(top);
//---------------------------组合菜单条----------------------------------------------
//为newItem添加快捷键 ctrl+N
newItem.setAccelerator(KeyStroke.getKeyStroke('N', InputEvent.CTRL_MASK));
newItem.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
textArea.append("用户点击了"新建"菜单\n");
}
});
//为file添加菜单项
file.add(newItem);
file.add(saveItem);
file.add(exitItem);
//为edit添加菜单项
edit.add(autoWrap);
edit.addSeparator();
edit.add(copyItem);
edit.add(pasteItem);
//为commentItem添加提示信息
commentItem.setToolTipText("将程序代码注释起来");
//为format菜单添加菜单项
format.add(commentItem);
format.add(cancelItem);
//给edit添加一个分隔符
edit.addSeparator();
//把format添加到edit中形成二级菜单
edit.add(format);
//把edit file 添加到菜单条中
menuBar.add(file);
menuBar.add(edit);
//把菜单条设置给窗口
frame.setJMenuBar(menuBar);
flavorGroup.add(metalItem);
flavorGroup.add(nimbusItem);
flavorGroup.add(windowsItem);
flavorGroup.add(classicItem);
flavorGroup.add(motifItem);
//给5个风格菜单创建事件监听器
ActionListener flavorLister = new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
String command = e.getActionCommand();
try {
changeFlavor(command);
} catch (Exception e1) {
e1.printStackTrace();
}
}
};
//为5个风格菜单项注册监听器
metalItem.addActionListener(flavorLister);
nimbusItem.addActionListener(flavorLister);
windowsItem.addActionListener(flavorLister);
classicItem.addActionListener(flavorLister);
motifItem.addActionListener(flavorLister);
pop.add(metalItem);
pop.add(nimbusItem);
pop.add(windowsItem);
pop.add(classicItem);
pop.add(motifItem);
//调用textArea组件的setComponentPopupMenu即可设置右键菜单，无需使用事件
textArea.setComponentPopupMenu(pop);
// 设置关闭窗口时推出程序
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
//设置jFrame最佳大小并可见
frame.pack();
frame.setVisible(true);
}
//定义一个方法，用于改变界面风格
private void changeFlavor(String command) throws Exception{
switch (command){
case "Metal 风格":
UIManager.setLookAndFeel("javax.swing.plaf.metal.MetalLookAndFeel");
break;
case "Nimbus 风格":
UIManager.setLookAndFeel("javax.swing.plaf.nimbus.NimbusLookAndFeel");
break;
case "Windows 风格":
UIManager.setLookAndFeel("com.sun.java.swing.plaf.windows.WindowsLookAndFeel");
break;
case "Windows 经典风格":
UIManager.setLookAndFeel("com.sun.java.swing.plaf.windows.WindowsClassicLookAndFeel");
break;
case "Motif 风格":
UIManager.setLookAndFeel("com.sun.java.swing.plaf.motif.MotifLookAndFeel");
break;
}
//更新窗口内顶级容器以及所有组件的UI
SwingUtilities.updateComponentTreeUI(frame.getContentPane());
//更新mb菜单条及每部所有组件UI
SwingUtilities.updateComponentTreeUI(menuBar);
//更新右键菜单及内部所有菜单项的UI
SwingUtilities.updateComponentTreeUI(pop);
}
public static void main(String[] args) {
//创建窗口
new swing_test_25().init();
}
}效果演示：
素材链接:
img-blog.csdnimg.cn/direct/e2ba782862f64694af460841dbb86bb5.png
img-blog.csdnimg.cn/direct/5e09d28a6caf416d82145600077152e7.png
img-blog.csdnimg.cn/direct/de7ff1de40f84947a7e8a454e4096dcc.png
img-blog.csdnimg.cn/direct/8ea757b4c350484eb7dfa0ef265ea634.png
