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+---
+title: 常见设计模式
+published: 2025-09-18
+description: ''
+image: ''
+tags: []
+category: '设计模式'
+draft: false 
+lang: ''
+---
+
+
+![](https://blog.meowrain.cn/api/i/2025/09/18/119exsd-1.webp)
+
+
+# 策略模式
+现实生活中我们到商场买东西的时候，卖场往往根据不同的客户制定不同的报价策略，比如针对新客户不打折扣，针对老客户打9折，针对VIP客户打8折...
+
+现在我们要做一个报价管理的模块，简要点就是要针对不同的客户，提供不同的折扣报价。
+```java
+package org.strategy;
+
+import java.math.BigDecimal;
+
+public class QuoteManager {
+    public BigDecimal quote(BigDecimal originalPrice, String customType){
+        if ("新客户".equals(customType)) {
+            System.out.println("抱歉！新客户没有折扣！");
+            return originalPrice;
+        }else if ("老客户".equals(customType)) {
+            System.out.println("恭喜你！老客户打9折！");
+            originalPrice = originalPrice.multiply(new BigDecimal(0.9)).setScale(2,BigDecimal.ROUND_HALF_UP);
+            return originalPrice;
+        }else if("VIP客户".equals(customType)){
+            System.out.println("恭喜你！VIP客户打8折！");
+            originalPrice = originalPrice.multiply(new BigDecimal(0.8)).setScale(2,BigDecimal.ROUND_HALF_UP);
+            return originalPrice;
+        }
+        //其他人员都是原价
+        return originalPrice;
+    }
+
+}
+
+```
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