Changes between Version 2 and Version 3 of codekata/harrypoter2

Timestamp:

10/17/2013 11:51:28 AM (13 years ago)

Author:

chenyang

Comment:

--

codekata/harrypoter2

@@ -17 +17 @@
         支持购买100元送10活动。
 }}}
-
+我们定义了结帐接口
+{{{
+package cn.pconline.harrypotter;
+
+import java.util.List;
+
+public interface PriceCalculator {
+
+        public int calculate(List<Book> list);
+}
+
+}}}
+[[BR]]
+单集购买5本，优惠7元。方案2
+[[BR]]
+测试代码
+{{{
+package cn.pconline.harrypotter;
+
+import java.util.ArrayList;
+import java.util.List;
+
+import junit.framework.Assert;
+
+import org.junit.Test;
+
+/**
+ * 测试"单集购买5本，优惠7元" 计价优惠方式
+ * @author pc
+ *
+ */
+public class DiscountCashierTest {
+
+        
+        DiscountCashier dc = new DiscountCashier();
+        
+        @Test
+        public void testCalculate() {
+                
+                //单集不够5本,总数够5本
+                List<Book> list = new ArrayList<Book>();
+                Book book1 = new Book(BookType.one);
+                Book book2 = new Book(BookType.two);
+                Book book3 = new Book(BookType.three);
+                Book book4 = new Book(BookType.four);
+                Book book5 = new Book(BookType.five);
+                
+                list.add(book1);
+                list.add(book2);
+                list.add(book3);
+                list.add(book4);
+                list.add(book5);
+                
+                int price = dc.calculate(list);
+                
+                Assert.assertEquals(5 * 800, price);
+                
+                list = new ArrayList<Book>();
+                
+                //单集够5本,第一集够5本
+                list.add(book1);
+                list.add(book1);
+                list.add(book1);
+                list.add(book1);
+                
+                list.add(book1);
+                list.add(book2);
+                price = dc.calculate(list);
+                
+                Assert.assertEquals(6 * 800 - 700, price);
+                
+                //多集够5本,第二集够5本
+                list.add(book2);
+                list.add(book2);
+                list.add(book2);
+                list.add(book2);
+                
+                price = dc.calculate(list);
+                
+                Assert.assertEquals((10 * 800) - (2 * 700),
+                                price);
+                
+                // 第一集有10本,第二集5本
+                list.add(book1);
+                list.add(book1);
+                list.add(book1);
+                list.add(book1);
+                list.add(book1);
+                
+                price = dc.calculate(list);
+                
+                Assert.assertEquals((15 * 800) - (3 * 700),
+                                price);
+        }
+}
+        
+}}}
+实现代码
+{{{
+package cn.pconline.harrypotter;
+
+import java.util.List;
+
+public class DiscountCashier implements PriceCalculator {
+
+        @Override
+        public int calculate(List<Book> list) {
+                //满足优惠的次数
+                int count = 0;
+                if(list == null){
+                        return 0;
+                }else{
+                        if(list.size() >= 5){
+                                for(BookType type : BookType.values()){
+                                        int num = 
+                                                        BookStore.getBookNumByType(type, list);
+                                        if( num >= 5){
+                                                count += num / 5;
+                                        };
+                                }
+                                return (800 * list.size()) - (count * 700);
+                        }else{
+                                return 800 * list.size();
+                        }
+                }
+        }
+}
+
+}}}
+送书活动,买7本送一本
+[[BR]]
+测试代码
+{{{
+package cn.pconline.harrypotter;
+
+import java.util.ArrayList;
+import java.util.List;
+
+import junit.framework.Assert;
+
+import org.junit.Test;
+
+public class SendBookActivityTest {
+        SendBookActivity dc = new SendBookActivity();
+        @Test
+        public void testCalulate() throws Exception {
+                //少于7本的情况
+                List<Book> list = new ArrayList<Book>();
+                Book book1 = new Book(BookType.one);
+                Book book2 = new Book(BookType.two);
+                list.add(book1);
+                list.add(book1);
+                list.add(book1);
+                list.add(book1);
+                list.add(book1);
+                list.add(book2);
+                
+                int price = dc.calculate(list);
+                Assert.assertEquals(6 * 800, price);
+                
+                //等于7本的情况
+                list.add(book2);
+                price = dc.calculate(list);
+                Assert.assertEquals((7-1) * 800, price);
+                
+                //等于14本
+                for(int i = 0 ; i < 7; i ++){
+                        list.add(book1);
+                }
+                
+                price = dc.calculate(list);
+                
+                Assert.assertEquals((14 - 2) * 800,price);
+                
+        }
+}
+        
+}}}
+实现代码
+{{{
+package cn.pconline.harrypotter;
+
+import java.util.List;
+
+/**
+ * 送书活动,买7本送一本
+ * @author pc
+ *
+ */
+public class SendBookActivity implements PriceCalculator{
+        public int calculate(List<Book> list){
+                
+                int saveTimes = 0; //优惠的次数
+                
+                if(list == null ){
+                        return 0;
+                }
+                saveTimes += list.size()/7;
+                return (list.size()-saveTimes) * 800; 
+        }
+}
+
+}}}
+买100减10(即90)
+[[BR]]
+测试代码
+{{{
+package cn.pconline.harrypotter;
+
+import java.util.ArrayList;
+import java.util.List;
+
+import org.junit.Assert;
+import org.junit.Test;
+
+public class SendMoneyActivityTest {
+
+        @Test
+        public void testCalculate() {
+                Book book = new Book(BookType.one);
+                List<Book> books = new ArrayList<Book>();
+                PriceCalculator pc = new SendMoneyActivity();
+                // 不足100块
+                books.add(book);
+                books.add(book);
+                int price =  pc.calculate(books);
+                Assert.assertEquals( 800 * 2 , price);
+                
+                // 大于100块
+                for(int i = 0 ;i < 11 ;i++){
+                        books.add(book);
+                }
+                price = pc.calculate(books);
+                Assert.assertEquals( 800 * 13 - 1000 , price);
+                
+                // 200块以上
+                for(int j = 0; j < 13; j++){
+                        books.add(book);
+                }
+                price = pc.calculate(books);
+                Assert.assertEquals((800 * 26) - (20 * 100), price);
+        }
+}
+}}}
+实现代码
+{{{
+package cn.pconline.harrypotter;
+
+import java.util.List;
+
+/**
+ * @author pc
+ *      买100减10(即90)
+ */
+public class SendMoneyActivity implements PriceCalculator {
+
+        @Override
+        public int calculate(List<Book> list) {
+                int price = 0;
+                //List为空(没有书）
+                if(list == null || list.isEmpty()){
+                        return price;
+                }
+                
+                //List不为空（有书）
+                int sumOfPrice = list.size() * 800; 
+                price = sumOfPrice - (sumOfPrice / 10000) * 1000; 
+                return price;
+        }
+}
+}}}