checkboxtest.java

来自「GUI代码,用与实现相关GUI的功能,如有需要即可自由下载!」· Java 代码 · 共 74 行

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


public class CheckBoxTest extends JFrame {
	private JTextField field;
	private JCheckBox bold ,italic;
	/**
	 * Launch the application
	 * @param args
	 */
	public static void main(String args[]) {
		try {
			CheckBoxTest frame = new CheckBoxTest();
			frame.setVisible(true);
			frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		} catch (Exception e) {
			e.printStackTrace();
		}
	}

	/**
	 * Create the frame
	 */
	public CheckBoxTest() {
		super("JCheckBox Test");
		Container cn = getContentPane();
		cn.setLayout(new FlowLayout());
		
		//set up JTextField and set its font
		field = new JTextField("Watch the font style change",20);
		field.setFont(new Font("Serif",Font.PLAIN,14));
		cn.add(field);
		
		//create checkbox objects
		bold = new JCheckBox("Bold");
		cn.add(bold);

		italic = new JCheckBox("Italic");
		cn.add(italic);
		
		//register listeners for JCheckBox
		CheckBoxHandler  handler = new CheckBoxHandler();
		bold.addItemListener(handler);
		italic.addItemListener(handler);
		
		setSize(800,600);
		setVisible(true);		
		//
	}
	private class CheckBoxHandler implements ItemListener
	{
			private int valBold = Font.PLAIN;
			private int valItalic = Font.PLAIN;
			
			public void itemStateChanged(ItemEvent event)
			{
				if((event.getSource())==bold)
					if(event.getStateChange()==ItemEvent.SELECTED)
						valBold = Font.BOLD;
					else valBold = Font.PLAIN;
				if(event.getSource()==italic)
					if(event.getStateChange()==ItemEvent.SELECTED)
						valItalic = Font.ITALIC;
					else valItalic = Font.PLAIN;
				field.setFont(new Font("Serif",valBold+valItalic,14));
				
			}
		
	}

}