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1、简单工厂模式 是一种创建型设计模式#xff0c;旨在通过一个工厂类#xff08;简单工厂#xff09;来封装对象的实例化过程 运算类 public class Operation { //这个是父类private double num1; //运算器中的两个值private double num2;public double getNu…工厂模式
1、简单工厂模式 是一种创建型设计模式旨在通过一个工厂类简单工厂来封装对象的实例化过程
运算类 public class Operation { //这个是父类private double num1; //运算器中的两个值private double num2;public double getNum1() {return num1;}public void setNum1(double num1) {this.num1 num1;}public double getNum2() {return num2;}public void setNum2(double num2) {this.num2 num2;}public double getResult() { //用于子类获取结果double result 0;return result;}
}加减乘类 public class OperationAdd extends Operation{ //加法Overridepublic double getResult() {double result 0;result super.getNum1() super.getNum2(); //从父类获取值return result;}
}public class OperationSub extends Operation{ //减法Overridepublic double getResult() { double result 0;result super.getNum1() - super.getNum2(); //从父类获取值return result;}
}public class OperationMul extends Operation{//乘法Overridepublic double getResult() {double result 0;result super.getNum1() * super.getNum2(); //从父类获取值return result;}
}工厂类 public class OperationFactory {public static Operation createOperation(String operate) { //这个是个工厂类Operation op null; //这个为null是因为要通过符号来确定子类对象switch (operate) { //判断符号实例合适的对象case :op new OperationAdd();break;case -:op new OperationSub();break;case *:op new OperationMul();break;}return op;}
}Main public class Main {public static void main(String[] args) {Operation op new OperationAdd();op OperationFactory.createOperation(*); //只要输出合适的计算符号工厂类就会实例出该有的对象op.setNum1(1);op.setNum2(2);double rusult op.getResult();System.out.println(rusult);}
}2、工厂模式实现
