用r语言 做网站点击热力图,舟山新闻最新消息,北京比较好的品牌设计公司,wordpress登录界面插件Go和Java实现简单工厂模式
本文通过计算器案例来说明简单工厂模式的使用#xff0c;使用Go语言和Java语言实现。
1、简单工厂模式
简单工厂模式对对象创建管理方式最为简单#xff0c;只需要创建一个简单的工厂类然后在里面创建对象#xff0c;该模式通过向工
厂传递类型…Go和Java实现简单工厂模式
本文通过计算器案例来说明简单工厂模式的使用使用Go语言和Java语言实现。
1、简单工厂模式
简单工厂模式对对象创建管理方式最为简单只需要创建一个简单的工厂类然后在里面创建对象该模式通过向工
厂传递类型来指定要创建的对象。
由于 Go 本身是没有构造函数的一般而言我们采用 NewName 的方式创建对象/接口当它返回的是接口的时
候其实就是简单工厂模式。
2、Go实现简单计算器
下面实现一个简单的计算器包含简单的加减乘除功能。
package factory// 这里实现一个简单的计算器
// 计算接口,包含计算数的设置和结果的计算
type Operation interface {// 设置进行计算的两个数SetNumberA(float64)SetNumberB(float64)// 计算Calculate() (float64, error)
}package factory// 加法
type AddOperation struct {// 包含两个操作数numberA float64numberB float64
}func (addOperation *AddOperation) Calculate() (float64, error) {return addOperation.numberA addOperation.numberB, nil
}func (addOperation *AddOperation) SetNumberA(numberA float64) {addOperation.numberA numberA
}func (addOperation *AddOperation) SetNumberB(numberB float64) {addOperation.numberB numberB
}package factory// 减法
type SubOperation struct {// 包含两个操作数numberA float64numberB float64
}func (subOperation *SubOperation) Calculate() (float64, error) {return subOperation.numberA - subOperation.numberB, nil
}func (subOperation *SubOperation) SetNumberA(numberA float64) {subOperation.numberA numberA
}func (subOperation *SubOperation) SetNumberB(numberB float64) {subOperation.numberB numberB
}package factory// 乘法
type MulOperation struct {// 包含两个操作数numberA float64numberB float64
}func (mulOperation *MulOperation) Calculate() (float64, error) {return mulOperation.numberA * mulOperation.numberB, nil
}func (mulOperation *MulOperation) SetNumberA(numberA float64) {mulOperation.numberA numberA
}func (mulOperation *MulOperation) SetNumberB(numberB float64) {mulOperation.numberB numberB
}package factoryimport errors// 除法
type DivOperation struct {// 包含两个操作数numberA float64numberB float64
}func (divOperation *DivOperation) Calculate() (float64, error) {if divOperation.numberB 0 {return -1, errors.New(被除数不能为0)} else {return divOperation.numberA / divOperation.numberB, nil}
}func (divOperation *DivOperation) SetNumberA(numberA float64) {divOperation.numberA numberA
}func (divOperation *DivOperation) SetNumberB(numberB float64) {divOperation.numberB numberB
}package constantconst (Add Sub -Mul *Div /
)package factoryimport proj/constant// 工厂类
type OperationFactory struct {
}func (operationFactory *OperationFactory) CreateOperate(operate string) Operation {switch operate {case constant.Add:return AddOperation{}case constant.Sub:return SubOperation{}case constant.Mul:return MulOperation{}case constant.Div:return DivOperation{}}return nil
}package mainimport fmt
import . proj/factory
import proj/constant// 测试
func main() {// 全局变量var numberA float64 200var numberB float64 100var operation Operationvar result float64var err error// 创建工厂operationFactory : OperationFactory{}// 加法operation operationFactory.CreateOperate(constant.Add)operation.SetNumberA(numberA)operation.SetNumberB(numberB)result, err operation.Calculate()if err ! nil {fmt.Println(err)} else {fmt.Println(Add Result:, result)}// 减法operation operationFactory.CreateOperate(constant.Sub)operation.SetNumberA(numberA)operation.SetNumberB(numberB)result, err operation.Calculate()if err ! nil {fmt.Println(err)} else {fmt.Println(Sub Result:, result)}// 乘法operation operationFactory.CreateOperate(constant.Mul)operation.SetNumberA(numberA)operation.SetNumberB(numberB)result, err operation.Calculate()if err ! nil {fmt.Println(err)} else {fmt.Println(Mul Result:, result)}// 除法operation operationFactory.CreateOperate(constant.Div)operation.SetNumberA(numberA)operation.SetNumberB(numberB)result, err operation.Calculate()if err ! nil {fmt.Println(err)} else {fmt.Println(Div Result:, result)}
}# 程序输出
Add Result: 300
Sub Result: 100
Mul Result: 20000
Div Result: 23、Java实现简单计算器
package com.factory;// 这里实现一个简单的计算器
// 计算接口,包含计算数的设置和结果的计算
public abstract class Operation {private double numberA;private double numberB;// 设置进行计算的两个数public double getNumberA() {return numberA;}public void setNumberA(double numberA) {this.numberA numberA;}public double getNumberB() {return numberB;}public void setNumberB(double numberB) {this.numberB numberB;}// 计算public abstract double Calculate();
}package com.factory;// 加法
public class AddOperation extends Operation {Overridepublic double Calculate() {return this.getNumberA() this.getNumberB();}
}package com.factory;// 减法
public class SubOperation extends Operation {Overridepublic double Calculate() {return this.getNumberA() - this.getNumberB();}
}package com.factory;// 乘法
public class MulOperation extends Operation {Overridepublic double Calculate() {return this.getNumberA() * this.getNumberB();}
}package com.factory;// 除法
public class DivOperation extends Operation {Overridepublic double Calculate() {if (this.getNumberB() 0) {throw new RuntimeException(被除数不能为0!);} else {return this.getNumberA() / this.getNumberB();}}
}package com.factory;public enum OperationType {ADD, SUB, MUL, DIV;
}package com.factory;// 工厂类
public class OperationFactory {public Operation CreateOperate(OperationType operate) {switch (operate) {case ADD:return new AddOperation();case SUB:return new SubOperation();case MUL:return new MulOperation();case DIV:return new DivOperation();}return null;}
}package com.factory;public class Test {public static void main(String[] args) {// 全局变量Operation operation null;double result 0;// 创建工厂OperationFactory operationFactory new OperationFactory();// 加法operation operationFactory.CreateOperate(OperationType.ADD);operation.setNumberA(200);operation.setNumberB(100);result operation.Calculate();System.out.println(result : result);// 减法operation operationFactory.CreateOperate(OperationType.SUB);operation.setNumberA(200);operation.setNumberB(100);result operation.Calculate();System.out.println(result : result);// 乘法operation operationFactory.CreateOperate(OperationType.MUL);operation.setNumberA(200);operation.setNumberB(100);result operation.Calculate();System.out.println(result : result);// 除法operation operationFactory.CreateOperate(OperationType.DIV);operation.setNumberA(200);operation.setNumberB(100);result operation.Calculate();System.out.println(result : result);}
}# 程序输出
result :300.0
result :100.0
result :20000.0
result :2.0
