import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class OperationButton extends Button
{
  String 運(yùn)算符號(hào);
  public OperationButton(String s)
   {
    super(s);
    運(yùn)算符號(hào)=s;
    setForeground(Color.red);
   }
  public String get運(yùn)算符號(hào)()
   {
     return 運(yùn)算符號(hào);
   }
}