diff --git a/src/chapter5/Example01.java b/src/chapter5/Example01.java
new file mode 100644
index 0000000..208a8fc
--- /dev/null
+++ b/src/chapter5/Example01.java
@@ -0,0 +1,21 @@
+package chapter5;
+
+public class Example01 {
+    public static void main(String[] args) {
+        // 1、创建一个空的字符串
+        String str1 = new String();
+        // 2、创建一个内容为abcd的字符串
+        String str2 = new String("abcd");
+        // 3、创建一个内容为字符数组的字符串
+        char[] charArray = new char[]{'D', 'E', 'F'};
+        String str3 = new String(charArray);
+        // 4、创建一个内容为字节数组的字符串
+        byte[] arr = {97, 98, 99};
+        String str4 = new String(arr);
+
+        System.out.println("a" + str1 + "b");
+        System.out.println(str2);
+        System.out.println(str3);
+        System.out.println(str4);
+    }
+}
diff --git a/src/chapter5/Example02.java b/src/chapter5/Example02.java
new file mode 100644
index 0000000..a85909c
--- /dev/null
+++ b/src/chapter5/Example02.java
@@ -0,0 +1,13 @@
+package chapter5;
+
+public class Example02 {
+    public static void main(String[] args) {
+        String s = "abcdabc";
+        System.out.println("字符串的长度为：" + s.length());
+        System.out.println("字符串中第一个字符:" + s.charAt(0));
+        System.out.println("字符c第一次出现的位置:" + s.indexOf('c'));
+        System.out.println("字符c最后一次出现的位置:" + s.lastIndexOf('c'));
+        System.out.println("子字符串ab第一次出现的位置：" + s.indexOf("ab"));
+        System.out.println("子字符串ab字符串最后一次出现的位置：" + s.lastIndexOf("ab"));
+    }
+}
diff --git a/src/chapter5/Example03.java b/src/chapter5/Example03.java
new file mode 100644
index 0000000..0515400
--- /dev/null
+++ b/src/chapter5/Example03.java
@@ -0,0 +1,24 @@
+package chapter5;
+
+public class Example03 {
+    public static void main(String[] args) {
+        String str = "abcdEFG";
+
+        // 1、转换成字符数组
+        System.out.print("将字符串转为字符数组后的结果:");
+        char[] charArray = str.toCharArray();
+        for (char c : charArray) {
+            System.out.print(c);    // 打印当前遍历到的字符
+            System.out.print(',');  // 每打印一个字符后，加一个逗号
+        }
+
+        // 2、把数字转换成字符串（好用）
+        System.out.println();
+        System.out.print("把数字123转换成字符串的效果：");
+        System.out.println(String.valueOf(123));
+
+        // 3、大小写转换（常用）
+        System.out.println("转换成小写：" + str.toLowerCase());
+        System.out.println("转换成大写：" + str.toUpperCase());
+    }
+}
diff --git a/src/chapter5/Example04.java b/src/chapter5/Example04.java
new file mode 100644
index 0000000..c76fb75
--- /dev/null
+++ b/src/chapter5/Example04.java
@@ -0,0 +1,16 @@
+package chapter5;
+
+public class Example04 {
+    public static void main(String[] args) {
+        String name = "王小明";
+        String newName = name.replace("王", "卢");
+        System.out.println("旧名字：" + name + "\n新名字：" + newName);
+
+        System.out.println();
+
+        String name2 = "   王    小明   ";
+        String name3 = name2.trim();
+        System.out.println("去除空格前：" + name2 + "\n去除空格后：" + name3 );
+        // 思考：如何去掉所有空格？
+    }
+}
diff --git a/src/chapter5/Example05.java b/src/chapter5/Example05.java
new file mode 100644
index 0000000..179e04c
--- /dev/null
+++ b/src/chapter5/Example05.java
@@ -0,0 +1,14 @@
+package chapter5;
+
+public class Example05 {
+    public static void main(String[] args) {
+        String s1 = "我是王小明";
+        String s2 = "我是";
+
+        System.out.println("判断开头：" + s1.startsWith("我是"));
+        System.out.println("判断结尾：" + s1.endsWith("小明"));
+        System.out.println("判断包含：" + s1.contains("是"));
+        System.out.println("判空：" + s1.isEmpty());
+        System.out.println("判断相等：" + s1.equals(s2));
+    }
+}
diff --git a/src/chapter5/Example06.java b/src/chapter5/Example06.java
new file mode 100644
index 0000000..0f41c64
--- /dev/null
+++ b/src/chapter5/Example06.java
@@ -0,0 +1,16 @@
+package chapter5;
+
+public class Example06 {
+    public static void main(String[] args) {
+        String str = "石家庄-武汉-哈尔滨";
+        // 1、截取
+        System.out.println("从第5个字符截取到末尾：" + str.substring(4));
+        System.out.println("从第5个字符截取到第6个字符：" + str.substring(4, 6));
+        // 2、分割
+        System.out.println("分割后字符串数组中的元素依次是：");
+        String[] array = str.split("-");
+        for (String s : array) {
+            System.out.println(s);
+        }
+    }
+}