diff --git a/.gitignore b/.gitignore
index 0d839b7..056e6fb 100644
--- a/.gitignore
+++ b/.gitignore
@@ -25,6 +25,7 @@ hs_err_pid*
 #实验报告
 *.docx
 *.doc
+*.docx#
 
 #test.java
 test.java
\ No newline at end of file
diff --git a/实验7/src/task1/HelloCollections.java b/实验7/src/task1/HelloCollections.java
new file mode 100644
index 0000000..d4ac3ca
--- /dev/null
+++ b/实验7/src/task1/HelloCollections.java
@@ -0,0 +1,9 @@
+package task1;
+
+import java.util.ArrayList;
+
+public class HelloCollections {
+    public ArrayList run() {
+        return list;
+    }
+}
\ No newline at end of file
diff --git a/实验7/src/task2/WalkCollection.java b/实验7/src/task2/WalkCollection.java
new file mode 100644
index 0000000..8f20b3b
--- /dev/null
+++ b/实验7/src/task2/WalkCollection.java
@@ -0,0 +1,14 @@
+package task2;
+
+import java.util.ArrayList;
+import java.util.Iterator;
+
+public class WalkCollection {
+    public static void main(String[] args) {
+        ArrayList arrayListExample = new ArrayList();
+        // ---------------------Begin------------------------
+        // 使用迭代器iterator遍历arrayListExample集合
+        // 使用foreach遍历arrayListExample集合
+        // ---------------------End------------------------
+    }
+}
\ No newline at end of file
diff --git a/实验7/src/task3/HelloSet.java b/实验7/src/task3/HelloSet.java
new file mode 100644
index 0000000..3317af3
--- /dev/null
+++ b/实验7/src/task3/HelloSet.java
@@ -0,0 +1,17 @@
+package task3;
+
+import java.util.HashSet;
+import java.util.Scanner;
+
+public class HelloSet {
+    public static void main(String[] args) {
+        HashSet<Object> hashSet = new HashSet<>();
+        Scanner scanner = new Scanner(System.in);
+        for (int i = 0; i < 5; i++) {
+            hashSet.add(scanner.next());
+        }
+        // ---------------------Begin------------------------
+        // ---------------------End------------------------
+        hashSet.forEach(ele -> System.out.println(ele));
+    }
+}
\ No newline at end of file
diff --git a/实验7/src/task4/HelloHashMap.java b/实验7/src/task4/HelloHashMap.java
new file mode 100644
index 0000000..28061b0
--- /dev/null
+++ b/实验7/src/task4/HelloHashMap.java
@@ -0,0 +1,17 @@
+package task4;
+
+import java.util.HashMap;
+import java.util.HashSet;
+import java.util.Scanner;
+
+public class HelloHashMap {
+    public static void main(String[] args) {
+        Scanner scanner = new Scanner(System.in);
+        HashMap hashMapExample = new HashMap<>();
+        for (int i = 0; i < 2; i++) {
+            hashMapExample.put(scanner.next(), scanner.next());
+        }
+        // ---------------------Begin------------------------
+        // ---------------------End------------------------
+    }
+}