ch9_39.java

java图形用户界面设计 包括如何创建窗体 设计界面 管理布局 绘制图形 使用组件 事件编程等

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import java.util.Vector;
public class ch9_39 extends JFrame
{
	public ch9_39()
	{
		super("测试窗口");
		setBounds(20,20,500,300);
		setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
	}
	public static void main(String [] args)
	{
		ch9_39 f=new ch9_39();
		
		String [] s={"西瓜","苹果","草莓","西红柿","香蕉","葡萄"};
		JList lt=new JList(s);
		lt.setBorder(BorderFactory.createTitledBorder("水果"));
		lt.setCellRenderer(new CellRenderer());
		f.getContentPane().add(new JScrollPane(lt));
				
		f.pack();
		f.show();
	}
} 
class CellRenderer extends JLabel implements ListCellRenderer
{
	CellRenderer()
	{
		setOpaque(true);
	}
	public Component getListCellRendererComponent(JList aList,Object value,int index,boolean isSelected,boolean cellHasFocus)
	{
		if(value!=null)
		{
			setText(value.toString());
			setIcon(new ImageIcon("icon"+(index+1)+".jpg"));
		}
		if(isSelected)
		{
			setBackground(aList.getSelectionBackground());
			setForeground(aList.getSelectionForeground());
		}
		
		else
		{
			setBackground(aList.getBackground());
			setForeground(aList.getForeground());
			
		}
		return this;
		}
		

}