buttonexam.java

Java程序设计实用教程源代码 本书源代码按章分别放置在不同的文件夹中,所有程序均在JDK1.6环境下编译运行正常,除了第13章需要建立ODBC数据源之外,其他程序只要有Java运行环境即可直接运行

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

public class buttonExam extends JFrame{
  Container container;
  JLabel label1 = new JLabel("带图像和文本的JLabel组件",new ImageIcon("image//face.jpg"),JLabel.LEFT); 
  JTextField text1 = new JTextField("请注意文本的颜色和字体");
  JCheckBox boldbox = new JCheckBox("粗体");
  JCheckBox italicbox = new JCheckBox("斜体");
  JRadioButton blueRadio = new JRadioButton("蓝色");
  JRadioButton redRadio = new JRadioButton("红色",true);

  public buttonExam() { // 构造函数
    super("Swing按钮演示");
    container = this.getContentPane();
    container.setLayout(new GridLayout(3,1));
    container.add(label1);
    container.add(text1);
    text1.setForeground(Color.RED);
    JPanel jpanel1 = new JPanel(); // 定义一个面板
    jpanel1.setLayout(new GridLayout(2,2));
    ButtonGroup radioGroup = new ButtonGroup(); // 单选按钮组
    radioGroup.add(blueRadio);
    radioGroup.add(redRadio);
    jpanel1.add(boldbox);
    jpanel1.add(blueRadio);
    jpanel1.add(italicbox);
    jpanel1.add(redRadio);
    container.add(jpanel1);
    // 为两个JCheckBox对象注册监听者
    BoxEventHandler Boxhandler = new BoxEventHandler();
    boldbox.addItemListener(Boxhandler);
    italicbox.addItemListener(Boxhandler);
    // 为两个JRadioButton对象注册监听者
    RadioEventHandler Radiohandler = new RadioEventHandler();
    blueRadio.addItemListener(Radiohandler);
    redRadio.addItemListener(Radiohandler);
    setSize(400, 200);
    setVisible(true);
    addWindowListener(new WindowAdapter() {
      public void windowClosing(WindowEvent e) {
        System.exit(0);
      }
    });
  }

  // 定义一个处理JCheckBox事件的内部类
  private class BoxEventHandler
      implements ItemListener {
    private int valBold = Font.PLAIN;
    private int valItalic = Font.PLAIN;
    public void itemStateChanged(ItemEvent e) {
     if ( e.getSource() == boldbox )
       if ( e.getStateChange() == ItemEvent.SELECTED )
        valBold = Font.BOLD;
     else
       valBold = Font.PLAIN;
     if ( e.getSource() == italicbox )
       if ( e.getStateChange() == ItemEvent.SELECTED )
        valItalic = Font.ITALIC;
     else
       valItalic = Font.PLAIN;
     text1.setFont(new Font( "Serif", valBold + valItalic, 14 ) );
    }
  }

  // 定义一个处理JRadioButton事件的内部类
  private class RadioEventHandler
      implements ItemListener {
    private Color c;
    // 实现itemStateChanged()方法
    public void itemStateChanged(ItemEvent e) {
      if (e.getSource() == blueRadio)
        text1.setForeground(Color.BLUE);
      if (e.getSource() == redRadio)
        text1.setForeground(Color.RED);
    }
  }
  public static void main(String args[]) {
    buttonExam obj = new buttonExam();
    obj.setVisible(true);
  }
}