第三次修改

Calculator/src/Calculator.java

@@ -37,7 +37,7 @@ public class Calculator extends JFrame implements ActionListener {
 
         add(panel, BorderLayout.CENTER);
         setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
-        setSize(800, 500); // 设置窗口大小为宽800像素，高500像素
+        setSize(1000, 600); // 设置窗口大小为宽800像素，高500像素
         setLocationRelativeTo(null); // 窗口居中显示
         pack();
         setVisible(true);
@@ -99,7 +99,11 @@ public class Calculator extends JFrame implements ActionListener {
                 }
                 break;
         }
-        textField.setText("" + result);
+        if (result == Math.floor(result)) {
+            textField.setText(String.valueOf((int) result));
+        } else {
+            textField.setText(String.valueOf(result));
+        }
         operator = "";
         calculating = true;
     }