jradiobuttontest.java

学习Java的一些基本课件和源代码 对于初学者很有帮助的

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

public class JRadioButtonTest extends JFrame{
	private JTextField field;
	private Font plainFont,boldFont,italicFont;
	private JRadioButton plainButton,boldButton,italicButton;
	private ButtonGroup radioGroup;
	public JRadioButtonTest()
	{
		super("单选按钮示例");
		Container container=getContentPane();
		container.setLayout(new FlowLayout());
		field=new JTextField("单选按钮示例",15);
		container.add(field);
		plainButton=new JRadioButton("普通",true);
		container.add(plainButton);
		boldButton=new JRadioButton("加粗",false);
		container.add(boldButton);
		italicButton=new JRadioButton("斜体",false);
		container.add(italicButton);
		radioGroup=new ButtonGroup();
		radioGroup.add(plainButton);
		radioGroup.add(boldButton);
		radioGroup.add(italicButton);
		
		plainFont=new Font("Serif",Font.PLAIN,14);
		boldFont=new Font("Serif",Font.BOLD,14);
		italicFont=new Font("Serif",Font.ITALIC,14);
		field.setFont(plainFont);
		
		plainButton.addItemListener(new RadioButtonHandler(plainFont));
		boldButton.addItemListener(new RadioButtonHandler(boldFont));
		italicButton.addItemListener(new RadioButtonHandler(italicFont));
		
		setSize(220,100);
		setVisible(true);
	}
	private class RadioButtonHandler implements ItemListener{
		private Font font;
		public RadioButtonHandler(Font f)
		{
			font=f;
		}
		public void itemStateChanged(ItemEvent event)
		{
			field.setFont(font);
		}
	}
	
	public static void main(String args[])
	{
		JRadioButtonTest application=new JRadioButtonTest();
		application.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
	}
}