6218

UML.iml

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+<?xml version="1.0" encoding="UTF-8"?>
+<module type="JAVA_MODULE" version="4">
+  <component name="NewModuleRootManager" inherit-compiler-output="true">
+    <exclude-output />
+    <content url="file://$MODULE_DIR$">
+      <sourceFolder url="file://$MODULE_DIR$/src" isTestSource="false" />
+    </content>
+    <orderEntry type="jdk" jdkName="1.8" jdkType="JavaSDK" />
+    <orderEntry type="sourceFolder" forTests="false" />
+  </component>
+</module>

src/Calculator6218.java

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+
+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.TextField;
+import javafx.scene.layout.*;
+import javafx.stage.Stage;
+
+import java.util.Stack;
+
+public class Calculator6218 extends Application {
+    private TextField display;
+    private StringBuilder currentInput = new StringBuilder();
+
+    public static void main(String[] args) {
+        launch(args);
+    }
+
+    @Override
+    public void start(Stage primaryStage) {
+        VBox root = getRoot();
+        Scene scene = new Scene(root, 300, 400);
+        primaryStage.setTitle("计算器");
+        primaryStage.setScene(scene);
+        primaryStage.show();
+    }
+
+    private VBox getRoot() {
+        // 显示区域
+        display = new TextField("0");
+        display.setEditable(false);
+        display.setAlignment(Pos.CENTER_RIGHT);
+        display.setStyle("-fx-font-size: 24; -fx-background-color: #FFFFFF; -fx-border-color: #000000;");
+
+        // 按钮布局
+        GridPane buttonGrid = new GridPane();
+        buttonGrid.setPadding(new Insets(10));
+        buttonGrid.setHgap(10);
+        buttonGrid.setVgap(10);
+
+        // 创建按钮
+        String[] buttonLabels = {
+                "%", "CE", "C", "×",
+                "1/x", "x²", "√", "÷",
+                "7", "8", "9", "-",
+                "4", "5", "6", "+",
+                "1", "2", "3", "=",
+                "+/-", "0", "."
+        };
+
+        int index = 0;
+        for (int row = 0; row < 5; row++) {
+            for (int col = 0; col < 4; col++) {
+                Button button = new Button(buttonLabels[index]);
+                button.setMinSize(50, 50);
+                button.setOnAction(event -> handleButtonClick(button.getText()));
+                buttonGrid.add(button, col, row);
+                index++;
+            }
+        }
+
+        // 主布局
+        VBox root = new VBox(10);
+        root.setPadding(new Insets(20));
+        root.getChildren().addAll(display, buttonGrid);
+        return root;
+    }
+
+    private void handleButtonClick(String buttonText) {
+        // 处理按钮点击
+        switch (buttonText) {
+            case "C":
+                display.setText("0");
+                currentInput.setLength(0);
+                break;
+            case "CE":
+                currentInput.setLength(0);
+                display.setText("0");
+                break;
+            case "=":
+                try {
+                    double result = evaluateExpression(currentInput.toString());
+                    display.setText(String.valueOf(result));
+                    currentInput.setLength(0);
+                    currentInput.append(result);
+                } catch (Exception e) {
+                    display.setText("错误");
+                }
+                break;
+            case "+":
+            case "-":
+            case "×":
+            case "÷":
+            case "√":
+            case "x²":
+            case "1/x":
+                currentInput.append(convertOperator(buttonText));
+                display.setText(currentInput.toString());
+                break;
+            default:
+                currentInput.append(buttonText);
+                display.setText(currentInput.toString());
+                break;
+        }
+    }
+
+    private String convertOperator(String operator) {
+        switch (operator) {
+            case "×":
+                return "*";
+            case "÷":
+                return "/";
+            case "√":
+                return "Math.sqrt(";
+            case "x²":
+                return "^(2)";
+            case "1/x":
+                return "(1/(";
+            default:
+                return operator;
+        }
+    }
+
+    private double evaluateExpression(String expression) throws Exception {
+        // 使用简单的后缀表达式来评估表达式
+        String[] tokens = expression.split("(?<=[-+*/()])|(?=[-+*/()])");
+        Stack<Double> values = new Stack<>();
+        Stack<String> operations = new Stack<>();
+
+        for (String token : tokens) {
+            if (isNumeric(token)) {
+                values.push(Double.parseDouble(token));
+            } else if (isOperator(token)) {
+                while (!operations.isEmpty() && precedence(token) <= precedence(operations.peek())) {
+                    double b = values.pop();
+                    double a = values.pop();
+                    String op = operations.pop();
+                    values.push(applyOperation(a, b, op));
+                }
+                operations.push(token);
+            }
+        }
+
+        while (!operations.isEmpty()) {
+            double b = values.pop();
+            double a = values.pop();
+            String op = operations.pop();
+            values.push(applyOperation(a, b, op));
+        }
+
+        return values.pop();
+    }
+
+    private boolean isNumeric(String str) {
+        return str.matches("-?\\d+(\\.\\d+)?");
+    }
+
+    private boolean isOperator(String str) {
+        return str.equals("+") || str.equals("-") || str.equals("*") || str.equals("/") ||
+                str.equals("√") || str.equals("x²") || str.equals("1/x");
+    }
+
+    private int precedence(String operator) {
+        switch (operator) {
+            case "+": case "-":
+                return 1;
+            case "×": case "÷":
+                return 2;
+            case "√": case "x²":
+                return 3;
+            default:
+                return 0;
+        }
+    }
+
+    private double applyOperation(double a, double b, String operator) throws Exception {
+        switch (operator) {
+            case "+":
+                return a + b;
+            case "-":
+                return a - b;
+            case "*":
+                return a * b;
+            case "/":
+                if (b == 0) throw new Exception("除以零");
+                return a / b;
+            case "√":
+                return Math.sqrt(b);
+            case "x²":
+                return Math.pow(a, 2);
+            case "1/x":
+                if (a == 0) throw new Exception("除以零");
+                return 1 / a;
+            default:
+                return 0;
+        }
+    }
+}

src/Main.java

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+//TIP 要<b>运行</b>代码，请按 <shortcut actionId="Run"/> 或
+// 点击装订区域中的 <icon src="AllIcons.Actions.Execute"/> 图标。
+public class Main {
+    public static void main(String[] args) {
+        //TIP 当文本光标位于高亮显示的文本处时按 <shortcut actionId="ShowIntentionActions"/>
+        // 查看 IntelliJ IDEA 建议如何修正。
+        System.out.printf("Hello and welcome!");
+
+        for (int i = 1; i <= 5; i++) {
+            //TIP 按 <shortcut actionId="Debug"/> 开始调试代码。我们已经设置了一个 <icon src="AllIcons.Debugger.Db_set_breakpoint"/> 断点
+            // 但您始终可以通过按 <shortcut actionId="ToggleLineBreakpoint"/> 添加更多断点。
+            System.out.println("i = " + i);
+        }
+    }
+}