2019獨(dú)角獸企業(yè)重金招聘Python工程師標(biāo)準(zhǔn)>>>

實(shí)例：商店促銷?

(1)首先考慮用簡單工廠模式進(jìn)行設(shè)計(jì)?

?? 客戶端代碼Main.java

package com.yilong.sell.factory;

public class Main {

??? public static void main(String[] args) {

?????? //SellMethod sellMethod = SellMethodFactory.create("原價(jià)");

?????? SellMethod sellMethod = SellMethodFactory.create("方案一");

?????? if(sellMethod != null) {

?????????? sellMethod.setPrePrice(10);

?????????? sellMethod.setAmount(10);

?????????? System.out.println("總價(jià)：" + sellMethod.getSumPrice());

?????? } else {

?????????? System.out.println("暫未定義該銷售方案！");

?????? }

??? }??????????????????????????

}

?? 促銷形式類 SellMethod.java

package com.yilong.sell.factory;

public abstract class SellMethod {

??? private double prePrice;

??? private int amount;

??? public abstract double getSumPrice();

???

??? public int getAmount() {

?????? return amount;

??? }

??? public void setAmount(int amount) {

?????? this.amount = amount;

??? }

??? public double getPrePrice() {

?????? return prePrice;

??? }

??? public void setPrePrice(double prePrice) {

?????? this.prePrice = prePrice;

??? }

}

?? 原價(jià)銷售實(shí)現(xiàn)類 SellMethodPrototype.java

package com.yilong.sell.factory;

public class SellMethodPrototype extends SellMethod {

??? @Override

??? public double getSumPrice() {

?????? return this.getPrePrice() * this.getAmount();

??? }

}

?? 打折銷售實(shí)現(xiàn)類 SellMethodDiscount.java

package com.yilong.sell.factory;

public class SellMethodDiscount extends SellMethod {

??? public static final double DISCOUNT = 0.5;

??? @Override

??? public double getSumPrice() {

?????? return this.getPrePrice() * this.getAmount() * this.DISCOUNT;

??? }

}

?? 銷售方法生產(chǎn)類 SellMethodFactory.java

package com.yilong.sell.factory;

public class SellMethodFactory {

??? public static SellMethod create(String method) {

?????? SellMethod sellMethod = null;

?????? if(method.equals("原價(jià)")) {

?????????? sellMethod = new SellMethodPrototype();

?????? } else if(method.equals("方案一")){

?????????? sellMethod = new SellMethodDiscount();

?????? }

?????? return sellMethod;

??? }

}

(2)然后考慮用策略模式實(shí)現(xiàn)

?? 客戶端代碼 Main.java

package com.yilong.sell.strategy;

public class Main {

??? public static void main(String[] args) {

?????? SellGood sellGood = new SellGood("打5折");

?????? sellGood.setPrePrice(10);

?????? sellGood.setAmount(10);

?????? System.out.println("總價(jià)：" + sellGood.getSumPrice());

??? }

}

?? 銷售方式類 SellMethod.java

package com.yilong.sell.strategy;

public abstract class SellMethod {

??? public abstract double getSumPrice(double prePrice, int amount);

}

?? 原價(jià)銷售類 SellMethodPrototype.java

package com.yilong.sell.strategy;

public class SellMethodPrototype extends SellMethod {

??? @Override

??? public double getSumPrice(double prePrice, int amount) {

?????? return prePrice * amount;

??? }

}

?? 打折銷售類 SellMethodDiscount.java

package com.yilong.sell.strategy;

public class SellMethodDiscount extends SellMethod {

??? public static final double DISCOUNT = 0.5;

??? @Override

??? public double getSumPrice(double prePrice, int amount) {

?????? return prePrice * amount *

轉(zhuǎn)載于:https://my.oschina.net/lovedreamland/blog/12996

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