diff --git a/src/main/java/leetcode/editor/cn/TruncateSentence.java b/src/main/java/leetcode/editor/cn/TruncateSentence.java
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+//句子 是一个单词列表，列表中的单词之间用单个空格隔开，且不存在前导或尾随空格。每个单词仅由大小写英文字母组成（不含标点符号）。 
+//
+// 
+// 例如，"Hello World"、"HELLO" 和 "hello world hello world" 都是句子。 
+// 
+//
+// 给你一个句子 s 和一个整数 k ，请你将 s 截断 ，使截断后的句子仅含 前 k 个单词。返回 截断 s 后得到的句子。 
+//
+// 
+//
+// 示例 1： 
+//
+// 输入：s = "Hello how are you Contestant", k = 4
+//输出："Hello how are you"
+//解释：
+//s 中的单词为 ["Hello", "how" "are", "you", "Contestant"]
+//前 4 个单词为 ["Hello", "how", "are", "you"]
+//因此，应当返回 "Hello how are you"
+// 
+//
+// 示例 2： 
+//
+// 输入：s = "What is the solution to this problem", k = 4
+//输出："What is the solution"
+//解释：
+//s 中的单词为 ["What", "is" "the", "solution", "to", "this", "problem"]
+//前 4 个单词为 ["What", "is", "the", "solution"]
+//因此，应当返回 "What is the solution" 
+//
+// 示例 3： 
+//
+// 输入：s = "chopper is not a tanuki", k = 5
+//输出："chopper is not a tanuki"
+// 
+//
+// 
+//
+// 提示： 
+//
+// 
+// 1 <= s.length <= 500 
+// k 的取值范围是 [1, s 中单词的数目] 
+// s 仅由大小写英文字母和空格组成 
+// s 中的单词之间由单个空格隔开 
+// 不存在前导或尾随空格 
+// 
+// Related Topics 字符串 
+// 👍 6 👎 0
+
+package leetcode.editor.cn;
+//1816:截断句子
+public class TruncateSentence{
+    public static void main(String[] args) {
+        //测试代码
+        Solution solution = new TruncateSentence().new Solution();
+    }
+    //力扣代码
+    //leetcode submit region begin(Prohibit modification and deletion)
+class Solution {
+    public String truncateSentence(String s, int k) {
+        String[] strings = s.split(" ");
+        if (strings.length == 0) {
+            return s;
+        }
+        StringBuilder sBuilder = new StringBuilder();
+        for (int i = 0; i < k; i++) {
+            sBuilder.append(strings[i]).append(" ");
+        }
+        s = sBuilder.toString();
+        s = s.substring(0, s.length() - 1);
+        return s;
+    }
+}
+//leetcode submit region end(Prohibit modification and deletion)
+
+}
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diff --git a/src/main/java/leetcode/editor/cn/TruncateSentence.md b/src/main/java/leetcode/editor/cn/TruncateSentence.md
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+<p><strong>句子</strong> 是一个单词列表，列表中的单词之间用单个空格隔开，且不存在前导或尾随空格。每个单词仅由大小写英文字母组成（不含标点符号）。</p>
+
+<ul>
+	<li>例如，<code>"Hello World"</code>、<code>"HELLO"</code> 和 <code>"hello world hello world"</code> 都是句子。</li>
+</ul>
+
+<p>给你一个句子 <code>s</code>​​​​​​ 和一个整数 <code>k</code>​​​​​​ ，请你将 <code>s</code>​​ <strong>截断</strong> ​，​​​使截断后的句子仅含 <strong>前</strong> <code>k</code>​​​​​​ 个单词。返回 <strong>截断</strong> <code>s</code>​​​​<em>​​ </em>后得到的句子<em>。</em></p>
+
+<p> </p>
+
+<p><strong>示例 1：</strong></p>
+
+<pre><strong>输入：</strong>s = "Hello how are you Contestant", k = 4
+<strong>输出：</strong>"Hello how are you"
+<strong>解释：</strong>
+s 中的单词为 ["Hello", "how" "are", "you", "Contestant"]
+前 4 个单词为 ["Hello", "how", "are", "you"]
+因此，应当返回 "Hello how are you"
+</pre>
+
+<p><strong>示例 2：</strong></p>
+
+<pre><strong>输入：</strong>s = "What is the solution to this problem", k = 4
+<strong>输出：</strong>"What is the solution"
+<strong>解释：</strong>
+s 中的单词为 ["What", "is" "the", "solution", "to", "this", "problem"]
+前 4 个单词为 ["What", "is", "the", "solution"]
+因此，应当返回 "What is the solution"</pre>
+
+<p><strong>示例 3：</strong></p>
+
+<pre><strong>输入：</strong>s = "chopper is not a tanuki", k = 5
+<strong>输出：</strong>"chopper is not a tanuki"
+</pre>
+
+<p> </p>
+
+<p><strong>提示：</strong></p>
+
+<ul>
+	<li><code>1 &lt;= s.length &lt;= 500</code></li>
+	<li><code>k</code> 的取值范围是 <code>[1,  s 中单词的数目]</code></li>
+	<li><code>s</code> 仅由大小写英文字母和空格组成</li>
+	<li><code>s</code> 中的单词之间由单个空格隔开</li>
+	<li>不存在前导或尾随空格</li>
+</ul>
+<div><div>Related Topics</div><div><li>字符串</li></div></div>\n<div><li>👍 6</li><li>👎 0</li></div>
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