工厂模式简单运用

运用工厂模式实现简单计算

package com.product4;/** * 抽象的运算类，包括操作数 * @author Owner * */public abstract class Operation {private int num1;private int num2;/** * 运算结果的抽象方法 * @return */public abstract int getResult();public int getNum1() {return num1;}public void setNum1(int num1) {this.num1 = num1;}public int getNum2() {return num2;}public void setNum2(int num2) {this.num2 = num2;}}

package com.product4;/** * 加运算类，实现getResult获取加后的结果 * @author Owner * */public class AddOperation extends Operation{@Overridepublic int getResult() {return this.getNum1() + this.getNum2();}}

package com.product4;/** * 减运算类，实现具体的减操作运算 * @author Owner * */public class SubtractOperation extends Operation{@Overridepublic int getResult() {return this.getNum1() - this.getNum2();}}

package com.product4;/** * 运算的工厂类，主要生成加/减操作对象 * @author Owner * */public class OperationFactory {/** * 通过操作符号，获取运算对象 * @param oper * @return */public static Operation getOperation(String oper){if(oper.equals("+")){return new AddOperation();}else if(oper.equals("-")){return new SubtractOperation();}else{return null;}}}

package com.product4;import java.util.Scanner;/** *  * @author Owner * */public class Customer {public static void main(String[] args) {Scanner sc = new Scanner(System.in);System.out.println("输入第一个数：");int num1 = sc.nextInt();System.out.println("输入运算符：");String oper = sc.next();System.out.println("输入第二个数：");int num2 = sc.nextInt();//获取运算对象Operation operation = OperationFactory.getOperation(oper);operation.setNum1(num1);operation.setNum2(num2);System.out.println("运算结果为："+operation.getResult());}}

输出结果为：

输入第一个数：
3
输入运算符：
+
输入第二个数：
2
运算结果为：5