diff --git a/src/chapter5/Example08.java b/src/chapter5/Example08.java
new file mode 100644
index 0000000..433c0fc
--- /dev/null
+++ b/src/chapter5/Example08.java
@@ -0,0 +1,48 @@
+package chapter5;
+
+public class Example08 {
+    public static void main(String[] args) {
+        StringBuffer sb = new StringBuffer();
+
+        System.out.println("1、添加------------------------");
+        add(sb);
+        System.out.println("2、删除------------------------");
+        remove(sb);
+        System.out.println("3、修改------------------------");
+        alter();
+
+    }
+    public static void add(StringBuffer sb) {
+
+        sb.append("我王小明");
+        System.out.println("append添加结果：" + sb);
+
+        sb.insert(1, "的名字是");
+        System.out.println("insert添加结果：" + sb);
+
+        sb.append("白");
+        System.out.println("append添加结果：" + sb);
+    }
+
+    public static void alter() {
+        StringBuffer sb = new StringBuffer("我的性别是王小白");
+        sb.replace(2, 4, "姓名");
+        System.out.println("替换指定位置字符串：" + sb);
+
+        sb.setCharAt(0, '你');
+        System.out.println("修改指定位置字符：" + sb);
+
+        System.out.println("翻转：" + sb.reverse());
+    }
+
+    public static void remove(StringBuffer sb) {
+        sb.delete(0, 5);
+        System.out.println("delete的结果：" + sb);
+
+        sb.deleteCharAt(3);
+        System.out.println("deleteCharAt结果：" + sb);
+
+        sb.delete(0, sb.length());
+        System.out.println("清空：" + sb);
+    }
+}