2

_02/src/Calculator.java

@@ -1,66 +1,100 @@
-import java.util.Scanner;
+import javafx.application.Application;
+import javafx.geometry.Insets;
+import javafx.scene.Scene;
+import javafx.scene.control.Button;
+import javafx.scene.control.TextField;
+import javafx.scene.layout.GridPane;
+import javafx.scene.layout.VBox;
+import javafx.stage.Stage;
 
-public class Calculator {
-    // 加法
-    public static double add(double num1, double num2) {
-        return num1 + num2;
-    }
+public class Calculator extends Application {
+    private TextField display;
+    private double result = 0;
+    private String lastCommand = "=";
+    private boolean start = true;
 
-    // 减法
-    public static double subtract(double num1, double num2) {
-        return num1 - num2;
-    }
+    @Override
+    public void start(Stage primaryStage) {
+        // 创建显示区域
+        display = new TextField("0");
+        display.setEditable(false);
+        display.setPrefColumnCount(15);
 
-    // 乘法
-    public static double multiply(double num1, double num2) {
-        return num1 * num2;
-    }
+        // 创建按钮
+        GridPane grid = new GridPane();
+        grid.setPadding(new Insets(10));
+        grid.setHgap(10);
+        grid.setVgap(10);
 
-    // 除法
-    public static double divide(double num1, double num2) {
-        if (num2 == 0) {
-            throw new IllegalArgumentException("除数不能为零");
+        // 按钮布局
+        String[][] buttonLayout = {
+                {"7", "8", "9", "/"},
+                {"4", "5", "6", "*"},
+                {"1", "2", "3", "-"},
+                {"0", ".", "=", "+"}
+        };
+
+        for (int i = 0; i < 4; i++) {
+            for (int j = 0; j < 4; j++) {
+                Button button = new Button(buttonLayout[i][j]);
+                button.setOnAction(e -> processButtonPress(button.getText()));
+                grid.add(button, j, i);
+            }
         }
-        return num1 / num2;
-    }
 
-    public static void main(String[] args) {
-        Scanner scanner = new Scanner(System.in);
+        // 创建主布局
+        VBox root = new VBox();
+        root.setPadding(new Insets(10));
+        root.setSpacing(10);
+        root.getChildren().addAll(display, grid);
 
-        System.out.println("请输入第一个数字:");
-        double num1 = scanner.nextDouble();
+        // 创建场景
+        Scene scene = new Scene(root, 300, 300);
 
-        System.out.println("请输入第二个数字:");
-        double num2 = scanner.nextDouble();
+        // 设置舞台
+        primaryStage.setTitle("简易计算器");
+        primaryStage.setScene(scene);
+        primaryStage.show();
+    }
 
-        System.out.println("请选择操作 (+, -, *, /):");
-        String operator = scanner.next();
+    private void processButtonPress(String command) {
+        if (command.matches("[0-9]")) {
+            if (start) {
+                display.setText(command);
+                start = false;
+            } else {
+                display.setText(display.getText() + command);
+            }
+        } else if (command.equals(".")) {
+            if (start) {
+                display.setText("0.");
+                start = false;
+            } else if (!display.getText().contains(".")) {
+                display.setText(display.getText() + ".");
+            }
+        } else {
+            calculate(Double.parseDouble(display.getText()));
+            lastCommand = command;
+            start = true;
+        }
+    }
 
-        double result;
-        switch (operator) {
-            case "+":
-                result = add(num1, num2);
-                break;
-            case "-":
-                result = subtract(num1, num2);
-                break;
-            case "*":
-                result = multiply(num1, num2);
-                break;
-            case "/":
-                try {
-                    result = divide(num1, num2);
-                } catch (IllegalArgumentException e) {
-                    System.out.println(e.getMessage());
-                    return;
-                }
-                break;
-            default:
-                System.out.println("无效的操作符");
-                return;
+    private void calculate(double n) {
+        if (lastCommand.equals("+")) {
+            result += n;
+        } else if (lastCommand.equals("-")) {
+            result -= n;
+        } else if (lastCommand.equals("*")) {
+            result *= n;
+        } else if (lastCommand.equals("/")) {
+            result /= n;
+        } else {
+            result = n;
         }
+        display.setText(String.format("%.0f", result));
+    }
 
-        System.out.println("结果: " + num1 + " " + operator + " " + num2 + " = " + result);
-        scanner.close();
+    public static void main(String[] args) {
+        launch(args);
     }
 }