在软件工程中，类图是一种非常重要的设计工具，它能够以图形化的方式展示系统中类的结构、类之间的关系以及类的属性和方法。计算器作为一款基础的算术工具，其软件架构设计同样可以通过类图来清晰展示。下面，我们就来揭开计算器类图的神秘面纱。
类图概述
类图由三个主要部分组成：类、关联和继承。类是类图的核心，它代表了一个具有属性和方法的实体。关联表示类之间的交互关系，继承则表示类之间的层次关系。
计算器类图设计
1. 计算器类（Calculator）
计算器类是整个软件架构的核心，它负责处理所有的算术运算。以下是计算器类的属性和方法：
- 属性：
currentResult: 当前运算结果lastNumber: 上一个输入的数字operation: 上一个输入的操作符
- 方法：
inputNumber(number): 输入一个数字inputOperation(operation): 输入一个操作符calculateResult(): 计算结果clear(): 清除当前输入
public class Calculator {
private double currentResult;
private double lastNumber;
private String operation;
public void inputNumber(double number) {
// 实现输入数字的逻辑
}
public void inputOperation(String operation) {
// 实现输入操作符的逻辑
}
public double calculateResult() {
// 实现计算结果的逻辑
return currentResult;
}
public void clear() {
// 实现清除当前输入的逻辑
}
}
2. 数字类（Number）
数字类代表计算器中的数字，它包含数字的值和操作符：
- 属性：
value: 数字值operation: 操作符
- 方法：
getValue(): 获取数字值setValue(double value): 设置数字值getOperation(): 获取操作符setOperation(String operation): 设置操作符
public class Number {
private double value;
private String operation;
public double getValue() {
return value;
}
public void setValue(double value) {
this.value = value;
}
public String getOperation() {
return operation;
}
public void setOperation(String operation) {
this.operation = operation;
}
}
3. 操作符类（Operation）
操作符类代表计算器中的操作符，如加、减、乘、除等：
- 属性：
name: 操作符名称priority: 操作符优先级
- 方法：
execute(double a, double b): 执行操作符运算getName(): 获取操作符名称getPriority(): 获取操作符优先级
public class Operation {
private String name;
private int priority;
public String getName() {
return name;
}
public int getPriority() {
return priority;
}
public double execute(double a, double b) {
// 实现操作符运算逻辑
return 0;
}
}
类图展示
以下是一个简单的计算器类图示例：
”` +—————-+ +——————+ +——————+ | Number | | Operation | | Calculator | +—————-+ +——————+ +——————+ | - value: double | | - name: String | | - currentResult: | | - operation: String | | - priority: int | | - lastNumber: double | +—————-+ | + execute(double, | | - operation: String |
| | double): double | | + inputNumber(double): |
| | + getName(): String | | + inputOperation(String): |
| | + getPriority(): int | | + calculateResult(): double |
| +------------------+ | + clear(): void |
+—————-+ +——————+ +——————+
| ^ | |
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