gai

ipofss · ipofss · commit 6ceade6a992d · 2021-06-22T19:27:07.000+08:00
diff --git a/src/main/java/com/wbs/java8lambda/chapter11/Discount.java b/src/main/java/com/wbs/java8lambda/chapter11/Discount.java
@@ -0,0 +1,27 @@
+package com.wbs.java8lambda.chapter11;
+
+/**
+ * TODO
+ *
+ * @author: wangbingshuai
+ * @create: 2019-11-11 20:25
+ **/
+public class Discount {
+    public enum Code {
+        NONE(0), SILVER(5), GOLD(10), PLATINUM(25), DIAMOND(20);
+        private final int percentage;
+
+        Code(int percentage) {
+            this.percentage = percentage;
+        }
+    }
+
+    private static double apply(double price, Code code) {
+        Util.delay();
+        return Util.format(price * (100 - code.percentage) / 100);
+    }
+
+    public static String applyDiscount(Quote quote) {
+        return quote.getShopName() + " price is " + Discount.apply(quote.getPrice(), quote.getDiscountCode());
+    }
+}
diff --git a/src/main/java/com/wbs/java8lambda/chapter11/Quote.java b/src/main/java/com/wbs/java8lambda/chapter11/Quote.java
@@ -0,0 +1,26 @@
+package com.wbs.java8lambda.chapter11;
+
+import lombok.AllArgsConstructor;
+import lombok.Getter;
+
+/**
+ * TODO
+ *
+ * @author: wangbingshuai
+ * @create: 2019-11-11 20:29
+ **/
+@Getter
+@AllArgsConstructor
+public class Quote {
+    private final String shopName;
+    private final double price;
+    private final Discount.Code discountCode;
+
+    public static Quote parse(String s) {
+        String[] split = s.split(":");
+        String shopName = split[0];
+        double price = Double.parseDouble(split[1]);
+        Discount.Code discountCode = Discount.Code.valueOf(split[2]);
+        return new Quote(shopName, price, discountCode);
+    }
+}
diff --git a/src/main/java/com/wbs/java8lambda/chapter11/Shop.java b/src/main/java/com/wbs/java8lambda/chapter11/Shop.java
@@ -0,0 +1,34 @@
+package com.wbs.java8lambda.chapter11;
+
+import java.util.Random;
+
+/**
+ * TODO
+ *
+ * @author: wangbingshuai
+ * @create: 2019-11-11 20:04
+ **/
+public class Shop {
+    private final String name;
+    private final Random random;
+
+    public Shop(String name) {
+        this.name = name;
+        random = new Random(name.charAt(0) * name.charAt(1) * name.charAt(2));
+    }
+
+    public String getPrice(String product) {
+        double price = calculatePrice(product);
+        Discount.Code code = Discount.Code.values()[random.nextInt(Discount.Code.values().length)];
+        return name + ":" + price + ":" + code;
+    }
+
+    public double calculatePrice(String product) {
+        Util.delay();
+        return Util.format(random.nextDouble() * product.charAt(0) + product.charAt(1));
+    }
+
+    public String getName() {
+        return name;
+    }
+}
diff --git a/src/main/java/com/wbs/java8lambda/chapter11/Util.java b/src/main/java/com/wbs/java8lambda/chapter11/Util.java
@@ -0,0 +1,32 @@
+package com.wbs.java8lambda.chapter11;
+
+import java.text.DecimalFormat;
+import java.text.DecimalFormatSymbols;
+import java.util.Locale;
+
+/**
+ * TODO
+ *
+ * @author: wangbingshuai
+ * @create: 2019-11-11 20:04
+ **/
+public class Util {
+
+    private static final DecimalFormat DECIMAL_FORMAT = new DecimalFormat("#.##", new DecimalFormatSymbols(Locale.US));
+
+    public static void delay() {
+        int delay = 1000;
+        try {
+            Thread.sleep(delay);
+        } catch (InterruptedException e) {
+            throw new RuntimeException(e);
+        }
+    }
+
+    public static double format(double number) {
+        synchronized (DECIMAL_FORMAT) {
+            return new Double(DECIMAL_FORMAT.format(number));
+        }
+    }
+
+}
