标签：test print private 步骤 return bsp ber UI his
伟大软件的简易三步骤：
1.确认你的软件客户要它做的事。
2.运用基本的OO原则来增加软件的灵活性。
3.努力实现可维护、可重用的设计。
项目架构：
Guitar类：
1 package com.headfirst.guitar; 2 3 public class Guitar { 4 private String serialNumber, builder, model, type, backWood, topWood; 5 private double price; 6 7 public Guitar(String serialNumber, double price, String builder, 8 String model, String type, String backWood, String topWood){ 9 this.serialNumber = serialNumber; 10 this.price = price; 11 this.builder = builder; 12 this.model = model; 13 this.type = type; 14 this.backWood = backWood; 15 this.topWood = topWood; 16 } 17 18 public String getSerialNumber(){ 19 return serialNumber; 20 } 21 public double getPrice(){ 22 return price; 23 } 24 public void setPrice(float newPrice){ 25 this.price = newPrice; 26 } 27 public String getBuilder(){ 28 return builder; 29 } 30 public String getModel(){ 31 return model; 32 } 33 public String getType(){ 34 return type; 35 } 36 public String getBackWood(){ 37 return backWood; 38 } 39 public String getTopWood(){ 40 return topWood; 41 } 42 }
Inventory类：
1 package com.headfirst.guitar; 2 3 import java.util.Iterator; 4 import java.util.LinkedList; 5 import java.util.List; 6 7 public class Inventory { 8 9 private List guitars; 10 11 public Inventory(){ 12 guitars = new LinkedList(); 13 } 14 15 public void addGuitar(String serialNumber, double price, String builder, String model, String type, 16 String backWood, String topWood){ 17 Guitar guitar = new Guitar(serialNumber, price, builder, 18 model, type, backWood, topWood); 19 guitars.add(guitar); 20 } 21 22 public Guitar getGuitar(String serialNumber){ 23 for(Iterator i = guitars.iterator(); i.hasNext();){ 24 Guitar guitar = (Guitar) i.next(); 25 if(guitar.getSerialNumber().equals(serialNumber)){ 26 return guitar; 27 } 28 } 29 30 return null; 31 } 32 33 public Guitar search(Guitar searchGuitar){ 34 for(Iterator i = guitars.iterator(); i.hasNext();){ 35 Guitar guitar = (Guitar) i.next(); 36 String builder = searchGuitar.getBuilder(); 37 if((builder != null) && (!builder.equals("")) && 38 (!builder.equals(guitar.getBuilder()))) 39 continue; 40 41 String model = searchGuitar.getModel(); 42 if((model != null) && (!model.equals("")) && 43 (!model.equals(guitar.getModel()))) 44 continue; 45 46 String type = searchGuitar.getType(); 47 if((type != null) && (!type.equals("")) && 48 (!type.equals(guitar.getType()))) 49 continue; 50 51 String backWood = searchGuitar.getBackWood(); 52 if((backWood != null) && (!backWood.equals("")) && 53 (!backWood.equals(guitar.getBackWood()))) 54 continue; 55 56 String topWood = searchGuitar.getTopWood(); 57 if((topWood != null) && (!topWood.equals("")) && 58 (!topWood.equals(guitar.getTopWood()))) 59 continue; 60 return guitar; 61 } 62 63 return null; 64 } 65 }
搜寻测试代码：
1 package com.headfirst.guitar; 2 3 public class FindGuitarTester { 4 public static void main(String[] args){ 5 Inventory inventory = new Inventory(); 6 initializeInventory(inventory); 7 8 Guitar whatErinLikes = new Guitar("", 0, "fender", "Stratocastor", "electric", "Alder", "Alder"); 9 10 Guitar guitar = inventory.search(whatErinLikes); 11 if(guitar != null){ 12 System.out.println("Erin, you might like this " + 13 guitar.getBuilder() + " " + guitar.getModel() + 14 " " + guitar.getType() + " guitar:\n " + 15 guitar.getBackWood() + " back and sides,\n " + 16 guitar.getTopWood() + " top.\nYou can have it for only $" + 17 guitar.getPrice() + "!"); 18 }else{ 19 System.out.println("Sorry, Erin, we have nothing for you."); 20 } 21 } 22 23 private static void initializeInventory(Inventory inventory){ 24 inventory.addGuitar("V95693", 1499.95, "Fender", "Stratocastor", "electric", "Alder", "Alder"); 25 } 26 }
运行结果：
为什么，明明有，为什么说没有?
检查了代码，可能搜寻中“fender”的f是小写，而我们有的“Fender”是大写。
好，我们对吉他搜索工具进行第一个改善，去除掉所有String比较：
项目修改架构：
Builder.java：
1 package com.headfirst.guitar; 2 3 public enum Builder { 4 5 FENDER, MARTIN, GIBSON, COLLINGS, OLSON, RYAN, PRS, ANY; 6 7 public String toString(){ 8 switch(this){ 9 case FENDER: 10 return "Fender"; 11 case MARTIN: 12 return "Martin"; 13 case GIBSON: 14 return "Gibson"; 15 case COLLINGS: 16 return "Collings"; 17 case OLSON: 18 return "Olson"; 19 case RYAN: 20 return "Ryan"; 21 case PRS: 22 return "Prs"; 23 case ANY: 24 return "Any"; 25 default: 26 return ""; 27 } 28 } 29 }
Type.java：
1 package com.headfirst.guitar; 2 3 public enum Type { 4 ACOUSTIC, ELECTRIC; 5 6 public String toString(){ 7 switch(this){ 8 case ACOUSTIC: 9 return "acoustic"; 10 case ELECTRIC: 11 return "electric"; 12 default: 13 return ""; 14 } 15 } 16 }
Wood.java：
1 package com.headfirst.guitar; 2 3 public enum Wood { 4 INDIAN_ROSEWOOD, BRAZILIAN_ROSEWOOD, ALDER; 5 6 public String toString(){ 7 switch(this){ 8 case INDIAN_ROSEWOOD: 9 return "Indian Rosewood"; 10 case BRAZILIAN_ROSEWOOD: 11 return "Brazilian Rosewood"; 12 case ALDER: 13 return "Alder"; 14 default: 15 return ""; 16 } 17 } 18 }
修改FindGuitarTester.java第8行代码：
1 Guitar whatErinLikes = new Guitar("", 0, "Builder.FENDER", "Stratocastor", "Type.ELECTRIC", "Wood.ALDER", "Wood.ALDER");
修改Inventory.java中search()方法：
1 public Guitar search(Guitar searchGuitar){ 2 for(Iterator i = guitars.iterator(); i.hasNext();){ 3 Guitar guitar = (Guitar) i.next(); 4 5 if(searchGuitar.getBuilder() != guitar.getBuilder()) 6 continue; 7 8 String model = searchGuitar.getModel().toLowerCase(); 9 if((model != null) && (!model.equals("")) && 10 (!model.equals(guitar.getModel().toLowerCase()))) 11 continue; 12 13 if(searchGuitar.getType() != guitar.getType()) 14 continue; 15 16 if(searchGuitar.getBackWood() != guitar.getBackWood()) 17 continue; 18 19 if(searchGuitar.getTopWood() != guitar.getTopWood()) 20 continue; 21 22 return guitar; 23 } 24 25 return null; 26 }
现在我们担心的是Model属性，我们没有把它做成enum，并且Model没有办法限制，所以做不出enum。
除此之外：我们修改的地方还有：
各种变量的类型，用enum的全部替换掉。
标签：test print private 步骤 return bsp ber UI his
原文地址：http://www.cnblogs.com/lanshanxiao/p/7183526.html
