diff --git a/test/nuccu/.gitignore b/test/nuccu/.gitignore
new file mode 100644
index 0000000..f68d109
--- /dev/null
+++ b/test/nuccu/.gitignore
@@ -0,0 +1,29 @@
+### IntelliJ IDEA ###
+out/
+!**/src/main/**/out/
+!**/src/test/**/out/
+
+### Eclipse ###
+.apt_generated
+.classpath
+.factorypath
+.project
+.settings
+.springBeans
+.sts4-cache
+bin/
+!**/src/main/**/bin/
+!**/src/test/**/bin/
+
+### NetBeans ###
+/nbproject/private/
+/nbbuild/
+/dist/
+/nbdist/
+/.nb-gradle/
+
+### VS Code ###
+.vscode/
+
+### Mac OS ###
+.DS_Store
\ No newline at end of file
diff --git a/test/nuccu/.idea/.gitignore b/test/nuccu/.idea/.gitignore
new file mode 100644
index 0000000..35410ca
--- /dev/null
+++ b/test/nuccu/.idea/.gitignore
@@ -0,0 +1,8 @@
+# 默认忽略的文件
+/shelf/
+/workspace.xml
+# 基于编辑器的 HTTP 客户端请求
+/httpRequests/
+# Datasource local storage ignored files
+/dataSources/
+/dataSources.local.xml
diff --git a/test/nuccu/.idea/misc.xml b/test/nuccu/.idea/misc.xml
new file mode 100644
index 0000000..07115cd
--- /dev/null
+++ b/test/nuccu/.idea/misc.xml
@@ -0,0 +1,6 @@
+
+
+
+
+
+
\ No newline at end of file
diff --git a/test/nuccu/.idea/modules.xml b/test/nuccu/.idea/modules.xml
new file mode 100644
index 0000000..a8721c9
--- /dev/null
+++ b/test/nuccu/.idea/modules.xml
@@ -0,0 +1,8 @@
+
+
+
+
+
+
+
+
\ No newline at end of file
diff --git a/test/nuccu/.idea/vcs.xml b/test/nuccu/.idea/vcs.xml
new file mode 100644
index 0000000..b2bdec2
--- /dev/null
+++ b/test/nuccu/.idea/vcs.xml
@@ -0,0 +1,6 @@
+
+
+
+
+
+
\ No newline at end of file
diff --git a/test/nuccu/nuccu.iml b/test/nuccu/nuccu.iml
new file mode 100644
index 0000000..c90834f
--- /dev/null
+++ b/test/nuccu/nuccu.iml
@@ -0,0 +1,11 @@
+
+
+
+
+
+
+
+
+
+
+
\ No newline at end of file
diff --git a/test/nuccu/src/y22/q16/Main.java b/test/nuccu/src/y22/q16/Main.java
new file mode 100644
index 0000000..6bf4396
--- /dev/null
+++ b/test/nuccu/src/y22/q16/Main.java
@@ -0,0 +1,47 @@
+package y22.q16;
+
+/* HashSet是Java中常用的Set集合，向HashSet集合中添加数据对象时，首先会调用对象的hashCode()方法获取哈希码，根据哈希码计算对象的存储位置，如果相应位置上已经有数据对象，则会调用对象的equals()方法判断新加入的对象与现有对象是否重复，如果重复则拒绝加入。为了使用HashSet集合正确存储自定义类的对象，自定义类需要重写equals()方法和hashCode()方法。
+* 编写程序完成以下功能：定义一个学生类Student，属性包括String类型的id、name和int类型的age（id属性字符串内容相同的则认为是同一个学生），为三个属性定义get和set方法。重写equals()方法和hashCode()方法，使得当使用HashSet存储Student类的对象时，id重复的学生对象不能重复添加到集合。输入4个学生类对象的属性值，创建4个Student类对象，将其添加到一个HashSet集合，遍历集合，输出集合中各个学生的信息。
+* 输入说明：输入4个Student类对象的属性值，每个对象属性值按一行输入，以空格分割。
+* 输出说明：集合中存储的Student类对象的信息，每个对象信息占一行，输出格式为 id:name:age。
+* 输入样例1：
+* 2022001 Tom 19
+* 2022002 Jerry 18
+* 2022003 Eason 20
+* 2022002 Jerry 18
+* 输入样例2：
+* 2022001 Tom 19
+* 2022002 Jerry 18
+* 2022003 Eason 20
+* 2022004 Jerry 18
+
+* 输出样例1：
+* 2022001:Tom:19岁
+* 2022002:Jerry:18岁
+* 2022003:Eason:20岁
+* 输出样例2：
+* 2022001:Tom:19岁
+* 2022002:Jerry:18岁
+* 2022003:Eason:20岁
+* 2022004:Jerry:18岁*/
+
+import java.util.HashSet;
+import java.util.Scanner;
+
+public class Main {
+ public static void main(String[] args) {
+ Scanner sc = new Scanner(System.in);
+ Student[] students = new Student[4];
+ HashSet[] StudentSet;
+ for (int i = 0; i < students.length; i++) {
+ students[i] = new Student();
+ students[i].setId(sc.next());
+ students[i].setName(sc.next());
+ students[i].setAge(sc.nextInt());
+ }
+ StudentSet = students;
+ for (int i = 0; i < StudentSet.length; i++) {
+ System.out.println(StudentSet[i].toString());
+ }
+ }
+}
diff --git a/test/nuccu/src/y22/q16/Student.java b/test/nuccu/src/y22/q16/Student.java
new file mode 100644
index 0000000..8cca342
--- /dev/null
+++ b/test/nuccu/src/y22/q16/Student.java
@@ -0,0 +1,52 @@
+package y22.q16;
+
+import java.util.HashSet;
+import java.util.Objects;
+
+public class Student extends HashSet {
+ private String id;
+ private String name;
+ private int age;
+
+ public String getId() {
+ return id;
+ }
+
+ public void setId(String id) {
+ this.id = id;
+ }
+
+ public String getName() {
+ return name;
+ }
+
+ public void setName(String name) {
+ this.name = name;
+ }
+
+ public int getAge() {
+ return age;
+ }
+
+ public void setAge(int age) {
+ this.age = age;
+ }
+
+ @Override
+ public boolean equals(Object o) {
+ if (this == o) return true;
+ if(o==null||getClass()!=o.getClass()) return false;
+ Student student = (Student) o;
+ return Objects.equals(id,student.id);
+ }
+
+ @Override
+ public int hashCode() {
+ return Objects.hash(id);
+ }
+
+ @Override
+ public String toString() {
+ return this.id+":"+this.name+":"+this.age;
+ }
+}