diff --git "a/data/3.Java\351\253\230\351\230\266/4.\346\224\266\351\233\206\345\231\250/config.json" "b/data/3.Java\351\253\230\351\230\266/4.\346\224\266\351\233\206\345\231\250/config.json"
index 015f92dca3f02b18c22b9ead89e2c672f7e7a4e8..6edd4d8df9cbb97532fb18fbf9f9dcb2c44e49c1 100644
--- "a/data/3.Java\351\253\230\351\230\266/4.\346\224\266\351\233\206\345\231\250/config.json"
+++ "b/data/3.Java\351\253\230\351\230\266/4.\346\224\266\351\233\206\345\231\250/config.json"
@@ -2,6 +2,5 @@
   "node_id": "java-0f1fc49b2e1c41368403ca2239810920",
   "keywords": [],
   "children": [],
-  "export": [],
-  "title": "收集器简介"
+  "export": ["to_list.json"]
 }
\ No newline at end of file
diff --git "a/data/3.Java\351\253\230\351\230\266/4.\346\224\266\351\233\206\345\231\250/to_list.json" "b/data/3.Java\351\253\230\351\230\266/4.\346\224\266\351\233\206\345\231\250/to_list.json"
new file mode 100644
index 0000000000000000000000000000000000000000..53268b0021a3a48e9cb26c04eadd953b24039537
--- /dev/null
+++ "b/data/3.Java\351\253\230\351\230\266/4.\346\224\266\351\233\206\345\231\250/to_list.json"
@@ -0,0 +1,6 @@
+{
+  "type": "code_options",
+  "author": "刘鑫",
+  "source": "to_list.md",
+  "notebook_enable": false
+}
\ No newline at end of file
diff --git "a/data/3.Java\351\253\230\351\230\266/4.\346\224\266\351\233\206\345\231\250/to_list.md" "b/data/3.Java\351\253\230\351\230\266/4.\346\224\266\351\233\206\345\231\250/to_list.md"
new file mode 100644
index 0000000000000000000000000000000000000000..924b06db9433c0053e5786ef5bf07e2d49b45940
--- /dev/null
+++ "b/data/3.Java\351\253\230\351\230\266/4.\346\224\266\351\233\206\345\231\250/to_list.md"
@@ -0,0 +1,35 @@
+# Stream To List
+
+下面的选项尝试从一个整数 Stream 对象中构造 List。那么不正确的是：
+
+## 答案
+
+```java
+return  new ArrayList<>(stream);
+```
+
+## 选项
+
+### 推荐做法
+
+```java
+return stream.collect(Collectors.toList());
+```
+
+### 朴素做法，不推荐但可用
+
+```java
+List<Integer> result = new ArrayList<>();
+stream.foreach(x -> {
+    result.add(x);
+});
+return result;
+```
+
+### 方法引用
+
+```java
+List<Integer> result = new ArrayList<>();
+stream.foreach(result::add);
+```
+
diff --git "a/data/3.Java\351\253\230\351\230\266/4.\346\224\266\351\233\206\345\231\250/to_set.json" "b/data/3.Java\351\253\230\351\230\266/4.\346\224\266\351\233\206\345\231\250/to_set.json"
new file mode 100644
index 0000000000000000000000000000000000000000..e53c216c17a4e8d88123a1fe619a79f616d9cb49
--- /dev/null
+++ "b/data/3.Java\351\253\230\351\230\266/4.\346\224\266\351\233\206\345\231\250/to_set.json"
@@ -0,0 +1,6 @@
+{
+  "type": "code_options",
+  "author": "刘鑫",
+  "source": "to_set.md",
+  "notebook_enable": false
+}
\ No newline at end of file
diff --git "a/data/3.Java\351\253\230\351\230\266/4.\346\224\266\351\233\206\345\231\250/to_set.md" "b/data/3.Java\351\253\230\351\230\266/4.\346\224\266\351\233\206\345\231\250/to_set.md"
new file mode 100644
index 0000000000000000000000000000000000000000..abab24714dc5934f40f479135f89d3637c0cbeba
--- /dev/null
+++ "b/data/3.Java\351\253\230\351\230\266/4.\346\224\266\351\233\206\345\231\250/to_set.md"
@@ -0,0 +1,39 @@
+# Stream To Set
+
+下面的选项尝试从一个整数 Stream 对象中构造 List。那么不正确的是：
+
+## 答案
+
+```java
+return  new HashSet<>(stream);
+```
+
+## 选项
+
+### 推荐做法
+
+```java
+return stream.collect(Collectors.toSet());
+```
+
+### 朴素做法，不推荐但可用
+
+```java
+List<Integer> result = new ArrayList<>();
+        stream.foreach(x -> {
+        result.add(x);
+        });
+        return result;
+```
+
+### 方法引用
+
+```java
+Set<Integer> result = new HashSet<>();
+stream.foreach(result::add);
+```
+
+
+
+
+