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设计模式之简单工厂模式

admin 11月 13, 2020 0

前些天，拜读完大作大话设计模式，里面的示例代码是用C#写的，为了让自己加深一下影响，决定用Java写一下，顺便学着画画UML图^~^
UML:

Operation

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public abstract class Operation {
    private double numberA = 0;
    private double numberB = 0;
    private double result = 0;
    public double getResult() {
        return result;
    }
    public void setResult(double result) {
        this.result = result;
    }
    public double getNumberA() {
        return numberA;
    }
    public void setNumberA(double numberA) {
        this.numberA = numberA;
    }
    public double getNumberB() {
        return numberB;
    }
    public void setNumberB(double numberB) {
        this.numberB = numberB;
    }
    public abstract double calculate();
}

OperationFactory

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public class OperationFactory {
    public static Operation createOperate(String operate){
        Operation operation = null;
        switch (operate){
            case "+":
                operation = new OperationAdd();
                break;
            case "-":
                operation = new OperationSub();
                break;
            case "*":
                operation = new OperationMul();
                break;
            case "/":
                operation = new OperationDiv();
        }
        return operation;
    }
}

OperationAdd

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public class OperationAdd extends Operation {
    @Override
    public double calculate() {
        setResult(getNumberA() + getNumberB());
        return getResult();
    }
}

OperationDiv

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public class OperationDiv extends Operation{
    @Override
    public double calculate() {
        setResult(getNumberA() / getNumberB());
        return getResult();
    }
}

OperationSub

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public class OperationSub extends Operation{
    @Override
    public double calculate() {
        setResult(getNumberA() - getNumberB());
        return getResult();
    }
}

OperationMul

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public class OperationMul extends Operation{
    @Override
    public double calculate() {
        setResult(getNumberA() * getNumberB());
        return getResult();
    }
}

Client

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public class Client {
    public static void main(String [] args){
        Operation opera;
        opera = OperationFactory.createOperate("+");
        opera.setNumberA(1);
        opera.setNumberB(2);
        opera.calculate();
        System.out.println(opera.getResult());
        opera =OperationFactory.createOperate("-");
        opera.setNumberA(1);
        opera.setNumberB(2);
        opera.calculate();
        System.out.println(opera.getResult());
    }
}

编程是一门技术，更是一门艺术

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