guestnum.java

这是一个猜数字的小游戏

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import java.awt.event.ActionListener;
import java.util.EventListener;
public class GuestNum extends JFrame implements ActionListener
{
	double tempt;
	JLabel jl1,jl2,jl3;
	JTextField jtf;
	JButton jb1,jb2;
	JDialog jd;
	Container con=getContentPane();
	public GuestNum(String argu)
	{
		super(argu);
		tempt=Math.floor(1000*Math.random());
		jl1=new JLabel("Could you guest the 1 to 1000?");
		jl2=new JLabel("Please enter a number:");
		jl3=new JLabel();
		jtf=new JTextField(8);
		jb1=new JButton("Restart!");
		jb2=new JButton("Cancel");
		jd=new JDialog(this,"Error");
		con.add(jl1);
		con.add(jl2);
		con.add(jtf);
		con.add(jl3);	
		con.add(jb1);
		con.add(jb2);
		con.setLayout(new FlowLayout());
		jtf.addActionListener(this);
		jb1.addActionListener(this);
		jb2.addActionListener(this);
		this.setSize(300,300);
		this.setVisible(true);	
		this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
	}
	public static void main(String []args)
	{
		new GuestNum("Guest numbel");
	}

	/**
	 * Method actionPerformed
	 *
	 *
	 * @param e
	 *
	 */
	public void actionPerformed(ActionEvent e) 
	{
		double tempt;
		try
		{
			tempt=Double.parseDouble(jtf.getText());					
			if(e.getSource()==jtf)
			{		
				if(tempt>this.tempt)
				{
					con.setBackground(Color.red);
					jl3.setText("Too high!");
					jtf.setText("");
				}
				else if(tempt<this.tempt)
				{			
					con.setBackground(Color.blue);
					jl3.setText("Too low!");
					jtf.setText("");
				}
				else
				{
					jtf.setEnabled(false);
					jl3.setText("Ok,you guest the num!!");
					con.setBackground(Color.white);
				}
			}
		}
		catch(NumberFormatException nfe)
		{
			jd.setSize(100,100);
			jd.setVisible(true);
		}
		if(e.getSource()==jb1)
		{   
			this.tempt=Math.floor(1000*Math.random());
			jtf.setEnabled(true);		
		}
		if(e.getSource()==jb2)
		System.exit(0);
	}
}