工厂模式简单运用

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{

@Override
public 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{

@Override
public 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());
}
}