设计模式——工厂模式在开发中的应用（简单计算器）

package com.meritit; import java.util.Scanner; public class MainClass { public static void main(String[] args) { double result = 0; //1.接收控制台输入 System.out.println("-----计算器程序-----"); System.out.println("输入第一个操作数"); Scanner scan = new Scanner(System.in); String strNum1 = scan.nextLine(); System.out.println("输入运算符"); String oper = scan.nextLine(); System.out.println("输入第二个操作数"); String strNum2 = scan.nextLine(); double num1 = Double.parseDouble(strNum1); double num2 = Double.parseDouble(strNum2); //2.进行运算 try { OperationFactory oFactory = new AddOperationFactory(); Operation operation = oFactory.getOperation(oper); operation.setNum1(num1); operation.setNum2(num2); result = operation.getResult(); } catch (Exception e) { e.printStackTrace(); } //3.返回结果 System.out.println(strNum1 + oper + strNum2 + "=" + result); } }