comboboxtest.java

来自「一个J2SE的简单入门」· Java 代码 · 共 56 行

package 第八章;
import javax.swing.*;

import java.awt.*;
import java.awt.event.*;
public class ComboBoxTest {
	public static void main(String[] args)
	{
		ComboBoxFrame frame= new ComboBoxFrame();
		frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		frame.show();
		
		
	}
}
class ComboBoxFrame extends JFrame{
	public ComboBoxFrame()
	{
		setTitle("ComboBoxTest");
		setSize(DEFAULT_WIDTH, DEFAULT_HEIGHT );
		Container contentPane= getContentPane();
		//add the text label
		label= new JLabel("选择你的课程");
		contentPane.add(label,BorderLayout.CENTER);
		// make a combo box and  add face name
		faceCombo= new JComboBox();
		faceCombo.setEditable(true);
		faceCombo.addItem("物理");
		faceCombo.addItem("数学");
		faceCombo.addItem("英语");
		faceCombo.addItem("政治");
	
		// add listener
		faceCombo.addActionListener(new ActionListener()
				{	
					public void actionPerformed(ActionEvent event)
					{
						label.setFont(new Font((String)faceCombo.getSelectedItem(),Font.PLAIN,DEFAULT_SIZE));
					}
	
		});
		//add combo box  to a panel
		JPanel comboPanel= new JPanel();
		comboPanel.add(faceCombo);
		contentPane.add(comboPanel,BorderLayout.SOUTH);
	
	
	}
	public static final int DEFAULT_WIDTH = 300;
	public static final int DEFAULT_HEIGHT= 200;
	private JComboBox faceCombo;
	private JLabel label;
	private static final int DEFAULT_SIZE=12;


}