import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class OperationButton extends Button
{
	String operator;
	public OperationButton(String s)
	{
		super(s);
		operator=s;
		setForeground(Color.red);
	}
	public String getOperator()
	{
		return operator;
	}
};
//處理操作符