陈达坤：计算机页面

查诣杰：计算机功能

cdk/CalculatorApp.java

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+package cdk;
+
+import javafx.application.Application;
+import javafx.geometry.Insets;
+import javafx.geometry.Pos;
+import javafx.scene.Scene;
+import javafx.scene.control.Button;
+import javafx.scene.control.Label;
+import javafx.scene.control.TextField;
+import javafx.scene.layout.GridPane;
+import javafx.stage.Stage;
+
+public class CalculatorApp extends Application {
+
+    private TextField display;
+    private double firstNumber = 0;
+    private boolean userIsTypingSecondNumber = false;
+    private String currentOperator = "";
+
+    @Override
+    public void start(Stage primaryStage) {
+        primaryStage.setTitle("计算器");
+
+        display = new TextField();
+        display.setEditable(false);
+        display.setPrefColumnCount(16);
+
+        GridPane grid = new GridPane();
+        grid.setAlignment(Pos.CENTER);
+        grid.setPadding(new Insets(10, 10, 10, 10));
+        grid.setVgap(8);
+        grid.setHgap(8);
+
+        // 添加数字按钮
+        for (int i = 1; i <= 9; i++) {
+            Button btn = new Button(String.valueOf(i));
+            int finalI = i;
+            btn.setOnAction(e -> appendNumber(finalI));
+            grid.add(btn, i % 3, i / 3 + 1);
+        }
+
+        // 添加0按钮
+        Button btn0 = new Button("0");
+        btn0.setOnAction(e -> appendNumber(0));
+        grid.add(btn0, 0, 4);
+
+        // 添加点按钮
+        Button btnDot = new Button(".");
+        btnDot.setOnAction(e -> appendDot());
+        grid.add(btnDot, 1, 4);
+
+        // 添加操作符按钮
+        String[] operators = {"+", "-", "*", "/"};
+        int row = 5;
+        for (String op : operators) {
+            Button btnOp = new Button(op);
+            btnOp.setOnAction(e -> setOperator(op));
+            grid.add(btnOp, (op.equals("/") ? 3 : (op.equals("*") ? 2 : (op.equals("-") ? 1 : 0))), row);
+        }
+
+        // 添加等号按钮
+        Button btnEquals = new Button("=");
+        btnEquals.setOnAction(e -> calculate());
+        grid.add(btnEquals, 1, 5, 2, 1);
+
+        // 添加清除按钮
+        Button btnClear = new Button("C");
+        btnClear.setOnAction(e -> clear());
+        grid.add(btnClear, 3, 5);
+
+        // 将显示框添加到网格的第一行
+        grid.add(display, 0, 0, 4, 1);
+
+        Scene scene = new Scene(grid, 300, 400);
+
+        primaryStage.setScene(scene);
+        primaryStage.show();
+    }
+
+    private void appendNumber(int number) {
+        if (userIsTypingSecondNumber) {
+            display.setText(display.getText() + number);
+        } else {
+            firstNumber = firstNumber * 10 + number;
+            display.setText(String.valueOf(firstNumber));
+        }
+    }
+
+    private void appendDot() {
+        if (!display.getText().contains(".")) {
+            display.setText(display.getText() + ".");
+        }
+    }
+
+    private void setOperator(String operator) {
+        if (!currentOperator.isEmpty()) {
+            calculate();
+        }
+        currentOperator = operator;
+        userIsTypingSecondNumber = true;
+        display.setText("");
+    }
+
+    private void calculate() {
+        double secondNumber = Double.parseDouble(display.getText());
+        double result = 0;
+        boolean valid = true;
+
+        switch (currentOperator) {
+            case "+":
+                result = firstNumber + secondNumber;
+                break;
+            case "-":
+                result = firstNumber - secondNumber;
+                break;
+            case "*":
+                result = firstNumber * secondNumber;
+                break;
+            case "/":
+                if (secondNumber == 0) {
+                    display.setText("错误");
+                    valid = false;
+                } else {
+                    result = firstNumber / secondNumber;
+                }
+                break;
+        }
+
+        if (valid) {
+            display.setText(String.valueOf(result));
+            firstNumber = result;
+            currentOperator = "";
+            userIsTypingSecondNumber = false;
+        }
+    }
+
+    private void clear() {
+        display.setText("");
+        firstNumber = 0;
+        userIsTypingSecondNumber = false;
+        currentOperator = "";
+    }
+
+    public static void main(String[] args) {
+        launch(args);
+    }
+}