工厂方法模式

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#工厂模式

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本文介绍工厂方法模式的设计理念，通过创建Operation抽象类和具体的AddOperation类来实现加法操作，同时利用OperationFactory接口及其实现类AddOperationFactory来实例化相应的操作对象。此模式使得系统在增加新的操作类型时只需添加对应的实现类而无需修改现有代码。

工厂方法模式，相对于简单工厂模式，将工厂类也抽象出来，所有的具体工厂需要implements抽象工厂接口，当要添加新的方法时，只需要继承Operation抽象类实现对应方法，并implements抽象接口，返回新建的Operation对象

Operation.java

public abstract class Operation {
    private double num1;
    private double num2;

    public double  getResult() {return 0.0;}

    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;
    }
}

AddOperation.java

public class AddOperation extends Operation {
    @Override
    public double getResult(){
        return this.getNum1()+this.getNum2();
    }

}

OperationFactory.java

public interface OperationFactory {
    public Operation createOperation();
}

AddOperationFactory.java


public class AddOperationFactory implements OperationFactory {
    @Override
    public Operation createOperation() {
        return new AddOperation();
    }
}

Main.java

public class Main {
    public static void main(String args[]){
        Operation operation=null;
        OperationFactory operationFactory=new AddOperationFactory();
        operation=operationFactory.createOperation();
        operation.setNum1(1);
        operation.setNum2(2);
        System.out.println(operation.getResult());
        OperationFactory operationFactory1=new SubOperationFactory();
        operation=operationFactory1.createOperation();
        System.out.println(operation.getResult());

    }
}