龚心怡第二次修改

Calculator.java

@@ -5,7 +5,6 @@ import java.awt.event.ActionListener;
 import javax.script.ScriptEngineManager;
 import javax.script.ScriptEngine;
 import javax.script.ScriptException;
-
 public class Calculator extends JFrame implements ActionListener {
     private JTextField display;
     private StringBuilder input;