numberbutton.java

实现计算器功能

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class NumberButton extends JButton
{
	int num;
	public NumberButton(int num)
	{
		super(" "+num);
		this.num=num;
		setForeground(Color.blue);
	}
	public int getNumber()
	{
		return num;
	}
}