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README.md
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# work_calculator
# 计算器项目
## 简介
这是一个简单的计算器应用程序，支持基本的数学运算，如加法、减法、乘法和除法。该项目旨在帮助用户快速计算各种数学表达式。
## 安装步骤
1. 克隆此仓库：
```bash
git clone https://bdgit.educoder.net/fdzcxy212206216/work_calculator.git
## 使用说明
运行计算器：
运行Calculator类中的main方法
![image-20241010015743136](C:\Users\aa\AppData\Roaming\Typora\typora-user-images\image-20241010015743136.png)
## 功能特性
- 支持加法、减法、乘法、除法和取余
- 错误处理与输入验证
## 计算器界面
![image-20241010020124115](C:\Users\aa\AppData\Roaming\Typora\typora-user-images\image-20241010020124115.png)

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<item class="javax.swing.JToolBar$Separator" icon="/com/intellij/uiDesigner/icons/toolbarSeparator.svg" removable="false" auto-create-binding="false" can-attach-label="false">
<default-constraints vsize-policy="0" hsize-policy="0" anchor="0" fill="1" />
</item>
<item class="javax.swing.JScrollBar" icon="/com/intellij/uiDesigner/icons/scrollbar.svg" removable="false" auto-create-binding="true" can-attach-label="false">
<default-constraints vsize-policy="6" hsize-policy="0" anchor="0" fill="2" />
</item>
</group>
</component>
</project>

6
calculator/.idea/vcs.xml
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@ -1,6 +0,0 @@
<?xml version="1.0" encoding="UTF-8"?>
<project version="4">
<component name="VcsDirectoryMappings">
<mapping directory="$PROJECT_DIR$/.." vcs="Git" />
</component>
</project>

18
calculator/pom.xml
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<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>org.example</groupId>
<artifactId>calculator</artifactId>
<version>1.0-SNAPSHOT</version>
<properties>
<maven.compiler.source>8</maven.compiler.source>
<maven.compiler.target>8</maven.compiler.target>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
</properties>
</project>

34
calculator/src/main/java/org/example/Calculator.java
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@ -1,34 +0,0 @@
package org.example;
import javafx.application.Application;
import javafx.fxml.FXMLLoader;
import javafx.scene.Scene;
import javafx.scene.layout.BorderPane;
import javafx.stage.Stage;
import java.net.URL;
public class Calculator extends Application {
public static void main(String[] args) {
launch(args);
}
@Override
public void start(Stage primaryStage) throws Exception {
// 使用相对路径加载 FXML 文件
URL fxmlLocation = getClass().getResource("/org/example/CalculatorView.fxml");
if (fxmlLocation == null) {
throw new RuntimeException("FXML 文件未找到！");
}
System.out.println("尝试加载 FXML 文件: " + fxmlLocation);
FXMLLoader loader = new FXMLLoader(fxmlLocation);
BorderPane root = loader.load();
Scene scene = new Scene(root, 300, 400); // 窗口大小
primaryStage.setTitle("计算器");
primaryStage.setScene(scene);
primaryStage.show();
}
}

225
calculator/src/main/java/org/example/CalculatorController.java
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@ -1,225 +0,0 @@
package org.example;
import javafx.event.ActionEvent;
import javafx.fxml.FXML;
import javafx.scene.control.Button;
import javafx.scene.control.TextField;
import java.util.Stack;
import java.math.BigDecimal;
public class CalculatorController {
@FXML
private TextField display;
private StringBuilder expression = new StringBuilder();
private BigDecimal lastResult; // 存储上一次的结果
private boolean isResultDisplayed = false; // 标志是否显示结果
@FXML
private void handleButtonAction(ActionEvent event) {
String buttonText = ((Button) event.getSource()).getText();
if (buttonText.equals("=")) {
handleEqualsAction(event);
return;
}
if (buttonText.equals("AC")) {
handleClearAction(event);
return;
}
if (buttonText.equals("删除")) {
handleDeleteAction(event);
return;
}
// 如果结果已经显示
if (isResultDisplayed) {
if (Character.isDigit(buttonText.charAt(0))) {
// 输入数字，重新开始新的计算
expression.setLength(0);
expression.append(buttonText);
} else if (isOperator(buttonText.charAt(0))) {
// 继续使用上次结果进行运算
expression.setLength(0);
expression.append(lastResult).append(buttonText); // 附加运算符
}
isResultDisplayed = false; // 重置标志
} else {
// 处理小数点
if (buttonText.equals(".")) {
if (expression.length() > 0) {
char lastChar = expression.charAt(expression.length() - 1);
if (Character.isDigit(lastChar) || lastChar == '.') {
expression.append(buttonText);
}
} else {
expression.append("0.");
}
}
// 处理运算符
else if (isOperator(buttonText.charAt(0))) {
// 检查表达式是否为空，并且是否输入的是 + 或 - 之外的运算符
if (expression.length() == 0 && (buttonText.equals("*") || buttonText.equals("/") || buttonText.equals("%"))) {
display.setText("错误"); // 显示错误提示
return; // 直接退出，防止后续逻辑覆盖错误提示
} else {
if (expression.length() > 0) {
char lastChar = expression.charAt(expression.length() - 1);
if (isOperator(lastChar)) {
// 替换最后一个运算符
expression.setCharAt(expression.length() - 1, buttonText.charAt(0));
} else {
expression.append(buttonText);
}
} else {
// 处理在表达式为空时输入 + 或 - 的情况
expression.append(buttonText.equals("-") ? "-" : lastResult + buttonText);
}
}
}
// 处理数字
else {
expression.append(buttonText);
}
}
display.setText(expression.toString());
}
private boolean isOperator(char ch) {
return ch == '+' || ch == '-' || ch == '*' || ch == '/' || ch == '%';
}
@FXML
private void handleEqualsAction(ActionEvent event) {
if (expression.length() == 0 || isOperator(expression.charAt(expression.length() - 1))) {
display.setText("错误");
return; // 如果表达式为空或以运算符结尾，显示错误并返回
}
String result;
try {
result = calculateExpression(expression.toString());
} catch (ArithmeticException e) {
display.setText("错误");
return;
}
display.setText(result);
// 更新上次结果，准备继续运算
lastResult = new BigDecimal(result);
isResultDisplayed = true; // 设置标志，表明结果已显示
expression.setLength(0); // 清空表达式
}
@FXML
private void handleClearAction(ActionEvent event) {
// 清空表达式和显示框
expression.setLength(0);
display.setText("");
// 重置上次结果和标志
lastResult = BigDecimal.valueOf(0); // 清空上次结果
isResultDisplayed = false; // 重置标志
}
@FXML
private void handleDeleteAction(ActionEvent event) {
if (expression.length() > 0) {
expression.deleteCharAt(expression.length() - 1);
display.setText(expression.toString());
}
}
private int precedence(char op) {
switch (op) {
case '+':
case '-':
return 1;
case '*':
case '/':
case '%':
return 2;
}
return 0;
}
private String calculateExpression(String expression) {
Stack<BigDecimal> numbers = new Stack<>();
Stack<Character> operators = new Stack<>();
StringBuilder numberBuffer = new StringBuilder();
boolean lastWasOperator = true;
for (char ch : expression.toCharArray()) {
if (Character.isDigit(ch) || ch == '.') {
numberBuffer.append(ch);
lastWasOperator = false;
} else if (ch == '-' && lastWasOperator) {
// 处理负数
numberBuffer.append(ch);
} else {
if (numberBuffer.length() > 0) {
numbers.push(new BigDecimal(numberBuffer.toString()));
numberBuffer.setLength(0);
}
// 避免运算符栈为空时抛出异常
while (!operators.isEmpty() && precedence(ch) <= precedence(operators.peek())) {
if (numbers.size() < 2) {
display.setText("错误");
return "错误";
}
BigDecimal b = numbers.pop();
BigDecimal a = numbers.pop();
char op = operators.pop();
numbers.push(applyOperation(a, b, op));
}
operators.push(ch);
lastWasOperator = true;
}
}
if (numberBuffer.length() > 0) {
numbers.push(new BigDecimal(numberBuffer.toString()));
}
while (!operators.isEmpty()) {
if (numbers.size() < 2) {
display.setText("错误");
return "错误";
}
BigDecimal b = numbers.pop();
BigDecimal a = numbers.pop();
char op = operators.pop();
numbers.push(applyOperation(a, b, op));
}
return numbers.pop().toString();
}
private BigDecimal applyOperation(BigDecimal a, BigDecimal b, char op) {
switch (op) {
case '+': return a.add(b);
case '-': return a.subtract(b);
case '*': return a.multiply(b);
case '/':
if (b.compareTo(BigDecimal.ZERO) == 0) {
throw new ArithmeticException("Division by zero");
}
BigDecimal result = a.divide(b, 8, BigDecimal.ROUND_HALF_UP);
if (result.stripTrailingZeros().scale() <= 0) {
return result.setScale(0, BigDecimal.ROUND_HALF_UP);
} else {
return result.stripTrailingZeros();
}
case '%': return a.remainder(b);
}
return BigDecimal.ZERO;
}
}

57
calculator/src/main/resources/org/example/CalculatorView.fxml
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@ -1,57 +0,0 @@
<?xml version="1.0" encoding="UTF-8"?>
<?import javafx.scene.control.*?>
<?import javafx.scene.layout.*?>
<BorderPane maxHeight="-Infinity" maxWidth="-Infinity" minHeight="-Infinity" minWidth="-Infinity" prefHeight="400.0" prefWidth="300.0"
xmlns="http://javafx.com/javafx/8.0.171"
xmlns:fx="http://javafx.com/fxml/1"
fx:controller="org.example.CalculatorController">
<center>
<GridPane BorderPane.alignment="CENTER" hgap="10" vgap="10">
<columnConstraints>
<ColumnConstraints hgrow="ALWAYS" minWidth="50.0" prefWidth="75.0" />
<ColumnConstraints hgrow="ALWAYS" minWidth="50.0" prefWidth="75.0" />
<ColumnConstraints hgrow="ALWAYS" minWidth="50.0" prefWidth="75.0" />
<ColumnConstraints hgrow="ALWAYS" minWidth="50.0" prefWidth="75.0" />
</columnConstraints>
<rowConstraints>
<RowConstraints minHeight="10.0" prefHeight="60.0" vgrow="SOMETIMES" />
<RowConstraints minHeight="10.0" prefHeight="60.0" vgrow="SOMETIMES" />
<RowConstraints minHeight="10.0" prefHeight="60.0" vgrow="SOMETIMES" />
<RowConstraints minHeight="10.0" prefHeight="60.0" vgrow="SOMETIMES" />
<RowConstraints minHeight="10.0" prefHeight="60.0" vgrow="SOMETIMES" />
<RowConstraints minHeight="10.0" prefHeight="60.0" vgrow="SOMETIMES" />
</rowConstraints>
<children>
<TextField fx:id="display" editable="false" GridPane.columnSpan="4"
style="-fx-font-size: 24px; -fx-background-color: #f9f9f9; -fx-border-color: #ccc; -fx-padding: 10px;"/>
<Button text="7" onAction="#handleButtonAction" GridPane.rowIndex="1" GridPane.columnIndex="0" />
<Button text="8" onAction="#handleButtonAction" GridPane.rowIndex="1" GridPane.columnIndex="1" />
<Button text="9" onAction="#handleButtonAction" GridPane.rowIndex="1" GridPane.columnIndex="2" />
<Button text="/" onAction="#handleButtonAction" GridPane.rowIndex="1" GridPane.columnIndex="3" />
<Button text="4" onAction="#handleButtonAction" GridPane.rowIndex="2" GridPane.columnIndex="0" />
<Button text="5" onAction="#handleButtonAction" GridPane.rowIndex="2" GridPane.columnIndex="1" />
<Button text="6" onAction="#handleButtonAction" GridPane.rowIndex="2" GridPane.columnIndex="2" />
<Button text="*" onAction="#handleButtonAction" GridPane.rowIndex="2" GridPane.columnIndex="3" />
<Button text="1" onAction="#handleButtonAction" GridPane.rowIndex="3" GridPane.columnIndex="0" />
<Button text="2" onAction="#handleButtonAction" GridPane.rowIndex="3" GridPane.columnIndex="1" />
<Button text="3" onAction="#handleButtonAction" GridPane.rowIndex="3" GridPane.columnIndex="2" />
<Button text="-" onAction="#handleButtonAction" GridPane.rowIndex="3" GridPane.columnIndex="3" />
<Button text="." onAction="#handleButtonAction" GridPane.rowIndex="4" GridPane.columnIndex="0" />
<Button text="0" onAction="#handleButtonAction" GridPane.rowIndex="4" GridPane.columnIndex="1" GridPane.columnSpan="2" />
<Button text="\%" onAction="#handleButtonAction" GridPane.rowIndex="4" GridPane.columnIndex="2" />
<Button text="+" onAction="#handleButtonAction" GridPane.rowIndex="4" GridPane.columnIndex="3" />
<!-- 将 AC 按钮放在最后一行 -->
<Button text="AC" onAction="#handleClearAction" GridPane.rowIndex="5" GridPane.columnSpan="4" style="-fx-font-size: 24px;"/>
<Button text="删除" onAction="#handleDeleteAction" GridPane.rowIndex="5" GridPane.columnIndex="1" />
<Button text="=" onAction="#handleEqualsAction" GridPane.rowIndex="5" GridPane.columnIndex="3" />
</children>
</GridPane>
</center>
</BorderPane>
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