diff --git a/pom.xml b/pom.xml
index e68f9b7..2ddc0dd 100644
--- a/pom.xml
+++ b/pom.xml
@@ -68,6 +68,13 @@
             <version>1.3.2</version>
         </dependency>
 
+        <!-- https://mvnrepository.com/artifact/com.google.guava/guava -->
+        <dependency>
+            <groupId>com.google.guava</groupId>
+            <artifactId>guava</artifactId>
+            <version>26.0-jre</version>
+        </dependency>
+
         <dependency>
             <groupId>org.springframework</groupId>
             <artifactId>spring-webmvc</artifactId>
diff --git a/src/main/java/top/fjy8018/designpattern/pattern/creational/builder/chain/BuCourse.java b/src/main/java/top/fjy8018/designpattern/pattern/creational/builder/chain/BuCourse.java
index 6f59ad2..09d9b06 100644
--- a/src/main/java/top/fjy8018/designpattern/pattern/creational/builder/chain/BuCourse.java
+++ b/src/main/java/top/fjy8018/designpattern/pattern/creational/builder/chain/BuCourse.java
@@ -1,9 +1,24 @@
 package top.fjy8018.designpattern.pattern.creational.builder.chain;
 
+import com.google.common.collect.ImmutableSet;
+import org.apache.ibatis.builder.xml.XMLConfigBuilder;
+import org.apache.ibatis.parsing.XNode;
+
+import java.io.Reader;
+
 /**
  * 实体类
+ * 当只需要构建一个对象时，可以使用建造者，如果构建多个对象或者一类对象，则使用工厂方法或者抽象工厂
+ *
  * 用静态内部类建造者，实现链式调用（推荐）
  *
+ * JDK源码样例：{@link StringBuilder#append(int)} 和 {@link StringBuffer#append(int)} 区别在于后者对所有append方法加上同步关键字
+ * guava源码样例：不可变集合 {@link ImmutableSet.Builder#build()}
+ * Spring源码样例：{@link org.springframework.beans.factory.support.BeanDefinitionBuilder}
+ * mybatis源码样例：{@link org.apache.ibatis.session.SqlSessionFactoryBuilder#build(Reader)} 封装了读XML的操作
+ * 实际调用的是{@link XMLConfigBuilder#parseConfiguration(XNode)} 解析XML节点，将复杂的XML解析过程一次建造完成
+ *
+ *
  * @author F嘉阳
  * @date 2018-09-25 17:13
  */
diff --git a/src/test/java/top/fjy8018/designpattern/pattern/creational/builder/CourseBuilderTest.java b/src/test/java/top/fjy8018/designpattern/pattern/creational/builder/CourseBuilderTest.java
index ee522ca..202d96d 100644
--- a/src/test/java/top/fjy8018/designpattern/pattern/creational/builder/CourseBuilderTest.java
+++ b/src/test/java/top/fjy8018/designpattern/pattern/creational/builder/CourseBuilderTest.java
@@ -1,10 +1,11 @@
 package top.fjy8018.designpattern.pattern.creational.builder;
 
+import com.google.common.collect.ImmutableSet;
 import lombok.extern.slf4j.Slf4j;
 import org.junit.jupiter.api.Test;
 import top.fjy8018.designpattern.pattern.creational.builder.chain.BuCourse;
 
-import static org.junit.jupiter.api.Assertions.*;
+import java.util.Set;
 
 @Slf4j
 class CourseBuilderTest {
@@ -26,4 +27,13 @@ class CourseBuilderTest {
                 .build();
         log.info(course.toString());
     }
+
+    /**
+     * 不可变集合源码测试
+     */
+    @Test
+    void ImmutableSetBuild() {
+        Set<String> set = ImmutableSet.<String>builder().add("f").add("j").add("y").build();
+        log.info(set.toString());
+    }
 }
\ No newline at end of file