龚心怡修改结果2

Calculator.java

@@ -27,7 +27,6 @@ public class Calculator extends JFrame implements ActionListener {
                 "1", "2", "3", "-",
                 "C", "0", "=", "+"
         };
-
         for (String text : buttons) {
             JButton button = new JButton(text);
             button.setFont(new Font("Arial", Font.PLAIN, 24));