lucky.java

"luky52"是让用户对物品的价格进行猜测的小游戏,适合java初学者学习使用:)

import java.applet.*;
import java.awt.*;
import java.net.*;
import java.awt.event.*;

public class Lucky extends Applet implements ActionListener
{
	Panel pNorth=new Panel();
	PicPanel pCenter=new PicPanel();
	Panel pBottom=new Panel();
	TextField txField=new TextField(10);
	Label label=new Label("请输入你对商品价格的估计：");
	private int nPrice=1100;
						
	public Lucky()
	{
		super();
		this.setLayout(new BorderLayout());
		pNorth.add(label);
		pNorth.add(txField);
		add(pNorth,BorderLayout.NORTH);
		add(pCenter,BorderLayout.CENTER);
		Button btStart=new Button("开始游戏");
		Button btOk=new Button("确定");
		Button btCancel=new Button("取消");
		btStart.setActionCommand("start");
		btStart.addActionListener(this);
		btOk.setActionCommand("ok");
		btOk.addActionListener(this);
		btCancel.setActionCommand("cancel");
		btCancel.addActionListener(this);
		pBottom.add(btStart);
		pBottom.add(btOk);
		pBottom.add(btCancel);
		add(pBottom,BorderLayout.SOUTH);
		setBackground(Color.white);
		
	}
	public void actionPerformed(ActionEvent evt)
	{
		if(evt.getActionCommand().equals("start"))
		{
			pCenter.initImg();
			label.setText("请输入你对商品价格的估计：");
			pCenter.repaint();	
		}
		else if(evt.getActionCommand().equals("ok"))
		{
			int guessPrice=0;
			try
			{
				guessPrice=Integer.parseInt(txField.getText().trim());
				String guess=comparePrice(guessPrice);
				new MsgDlg(guess);
			}
			catch(Exception e)
			{
				e.printStackTrace();
			}
		}
		else if(evt.getActionCommand().equals("cancel"))
		{
			txField.setText("");
		}
	}
	public String comparePrice(int guessPrice)
	{
		if(guessPrice==nPrice)
		{
			return "你猜对了，恭喜你！";
		}
		else if(guessPrice>nPrice)
		{
			return "你猜的价格过高，请重新猜！";
		}
		else if(guessPrice<nPrice)
		{
			return "你猜的价格过低，请再加价！";
		}
		return "出错了";
	}
	
}
class PicPanel extends Panel
{
	String fileName="N3310.gif";
	Image m_img;
	public void initImg()
	{
        URL url=null;
        try
        {
        	url=Class.forName("Lucky").getResource("N3310.gif");
        }
        catch(Exception e){}
        m_img=getToolkit().getImage(url);
        MediaTracker mt=new MediaTracker(this);
        mt.addImage(m_img,1);
        try{
            mt.wait();
            mt.checkAll();
        }
        catch(Exception e){}
	}
	public void paint(Graphics g)
	{
		g.drawImage(m_img,125,0,50,160,this);
	}
}
class MsgDlg extends Frame implements ActionListener
{
	Label label=new Label();
	public MsgDlg(String strMsg)
	{
		super();
		setTitle("猜的结果");
		Panel p=new Panel();
		add(p);
		p.add(label);
		label.setText(strMsg);
		setSize(150,100);
		setLocation(300,200);
		Button btOk=new Button("确定");
		btOk.addActionListener(this);
		p.add(btOk);
		show();
	}
	public void actionPerformed(ActionEvent evt)
	{
		this.dispose();
	}
}