Java详解Swing中的几种常用按钮的使用

 package Swing;
 ​
 import javax.swing.*;
 import java.awt.*;
 import java.awt.event.ActionEvent;
 import java.awt.event.ActionListener;
 ​
 public class DanXuan extends JFrame {
     //单选按钮对象
     private ButtonGroup group;
     //将按钮放在JPanel面板上
     private JPanel panel;
     //将JPanel作为调色板
     private JPanel pallet;
     public DanXuan(){
         pallet =new JPanel();
         this.add(pallet,BorderLayout.CENTER);
         panel=new JPanel();
         group=new ButtonGroup();
         addJRadioButton("灰");
         addJRadioButton("粉");
         addJRadioButton("黄");
         this.add(panel,BorderLayout.SOUTH);
         this.setSize(300,300);
         this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
         this.setVisible(true);
     }
     //创建一个带有文本信息的单选按钮，将按钮添加到panel面板和ButtonGroup按钮组中，并添加一个监听器
     private void addJRadioButton(final String text){
         JRadioButton radioButton=new JRadioButton(text);
         group.add(radioButton);
         panel.add(radioButton);
         radioButton.addActionListener(new ActionListener() {
             @Override
             public void actionPerformed(ActionEvent e) {
                 Color color=null;
                 if("灰".equals(text)){
                     color=Color.GRAY;
                 }else if("粉".equals(text)){
                     color=Color.PINK;
                 }else if("黄".equals(text)){
                     color=Color.YELLOW;
                 }else {
                     color=Color.WHITE;
                 }
                 pallet.setBackground(color);
             }
         });
     }
     public static void main(String[] args) {
         new DanXUan();
     }
 }

package Swing;
 import javax.swing.*;
 import java.awt.*;
 import java.awt.event.ActionEvent;
 import java.awt.event.ActionListener;
 public class  DuoXuan extends JFrame {
     private  JCheckBox italic;
     private JCheckBox bold;
     private JLabel label;
     public DuoXuan (){
         label=new JLabel("我的世界",JLabel.CENTER);
         label.setFont(new Font("宋体",Font.PLAIN,20));
          Component lable ;
         Label p1 = new Label();
         this.add(p1);
         JPanel panel=new JPanel();
         italic=new JCheckBox("ITALIC");
         bold=new JCheckBox("BOLD");
         ActionListener listener=new ActionListener() {
             @Override
             public void actionPerformed(ActionEvent e) {
                 int mode = 0;
                 if(bold.isSelected())
                     mode+=Font.BOLD;
                 if(italic.isSelected())
                     mode+=Font.ITALIC;
                 label.setFont(new Font("宋体",mode,20));
             }
         };
         italic.addActionListener(listener);
         bold.addActionListener(listener);
         panel.add(italic);
         panel.add(bold);
         this.add(panel,BorderLayout.SOUTH);
         this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
         this.setSize(300,300);
         this.setVisible(true);
     }
     public static void main(String[] args) {
         new DuoXuan ();
     }
 }

package Swing;
 import javax.swing.*;
 import java.awt.*;
 import java.awt.event.ActionEvent;
 import java.awt.event.ActionListener;
 public class XiaLa extends JFrame {
     //创建一个组合框
     private JComboBox comboBox;
     //创建一个文本框
     private JTextField field;
     public  XiaLa(){
         //创建一个面板
         JPanel panel=new JPanel();
         comboBox=new JComboBox();
         //为组合框添加选项
         comboBox.addItem("请选择城市");
         comboBox.addItem("驻马店");
         comboBox.addItem("郑州");
         comboBox.addItem("开封");
         comboBox.addItem("漯河");
         comboBox.addItem("南阳");
         comboBox.addItem("洛阳");
         comboBox.addItem("济源");
         comboBox.addItem("商丘");
         comboBox.addItem("新乡");
         comboBox.addItem("周口");
         comboBox.addItem("信阳");
         comboBox.addItem("三门峡");
         comboBox.addItem("濮阳");
         comboBox.addItem("许昌");
         comboBox.addItem("安阳");
         comboBox.addItem("鹤壁");
         comboBox.addItem("焦作");
         comboBox.addItem("平顶山");
         //为组合框设置事件监听器
         comboBox.addActionListener(new ActionListener() {
             @Override
             public void actionPerformed(ActionEvent e) {
                 String item =(String) comboBox.getSelectedItem();
                 if("请选择城市".equals(item)){
                     field.setText("");
 ​
                 }else{
                     field.setText("你选择的城市是:"+item);
                 }
             }
         });
         field=new JTextField(20);
         panel.add(comboBox);
         panel.add(field);
         //在内容面板中添加JPanel面板
         this.add(panel, BorderLayout.NORTH);
         this.setSize(350,100);
         this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
         this.setVisible(true);
     }
     public static void main(String[] args) {
         new  XiaLa();
     }
 }