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();

      }

  }