diff --git a/01_Intellij_Java_universal_20240419/untitled/src/javaAssignment_20240418/box.java b/01_Intellij_Java_universal_20240419/untitled/src/javaAssignment_20240418/box.java
new file mode 100644
index 0000000..52a5438
--- /dev/null
+++ b/01_Intellij_Java_universal_20240419/untitled/src/javaAssignment_20240418/box.java
@@ -0,0 +1,36 @@
+/*
+ *   Function: 盒子类
+ *   Date: 2024 04 18
+ *   Code by: JRNitre
+ * */
+
+package javaAssignment_20240418;
+
+public class box {
+    double length;
+    double width;
+    double height;
+
+    public void setBox_length (double l){
+        length = l;
+    }
+    public void setBox_width (double w){
+        width = w;
+    }
+    public void setBox_height (double h){
+        height = h;
+    }
+    public void printVolume(){
+        System.out.println(height * width * length);
+    }
+
+    public static void main (String[] args){
+        box b_1 = new box();
+
+        b_1.setBox_height(5);
+        b_1.setBox_length(2);
+        b_1.setBox_width(3);
+
+        b_1.printVolume();
+    }
+}
diff --git a/01_Intellij_Java_universal_20240419/untitled/src/javaAssignment_20240418/complex.java b/01_Intellij_Java_universal_20240419/untitled/src/javaAssignment_20240418/complex.java
new file mode 100644
index 0000000..5194ef3
--- /dev/null
+++ b/01_Intellij_Java_universal_20240419/untitled/src/javaAssignment_20240418/complex.java
@@ -0,0 +1,44 @@
+/*
+ *   Function: 虚数和
+ *   Date: 2024 04 18
+ *   Code by: JRNitre
+ * */
+
+package javaAssignment_20240418;
+public class complex {
+    // 实部
+    private int realPart;
+    // 虚部
+    private int imaginePart;
+
+    // 无参构造方法
+    public complex() {
+        this.realPart = 0;
+        this.imaginePart = 0;
+    }
+
+    // 有参构造方法
+    public complex (int r, int i){
+        this.realPart = r;
+        this.imaginePart = i;
+    }
+
+    public complex complexAdd (complex a){
+        complex temp = new complex();
+        temp.realPart = this.realPart + a.realPart;
+        temp.imaginePart = this.imaginePart + a.imaginePart;
+        return temp;
+    }
+
+    public String ToString (){
+        return this.realPart + " + " + this.imaginePart + "i";
+    }
+
+    public static void main (String[] args){
+        complex c_1 = new complex(1,2);
+        complex c_2 = new complex(2,3);
+        complex c_out = c_1.complexAdd(c_2);
+
+        System.out.println(c_out.ToString());
+    }
+}
diff --git a/01_Intellij_Java_universal_20240419/untitled/src/javaAssignment_20240418/student.java b/01_Intellij_Java_universal_20240419/untitled/src/javaAssignment_20240418/student.java
new file mode 100644
index 0000000..c1e1498
--- /dev/null
+++ b/01_Intellij_Java_universal_20240419/untitled/src/javaAssignment_20240418/student.java
@@ -0,0 +1,89 @@
+/*
+ *   Function: 学生类
+ *   Date: 2024 04 18
+ *   Code by: JRNitre
+ * */
+
+package javaAssignment_20240418;
+
+import java.util.Objects;
+
+public class student {
+    private int studentID;
+    private String name;
+    private boolean gender;
+    private int age;
+    private int math;
+    private int english;
+    private int chinese;
+
+    public void addStudent_ID (int id){
+        this.studentID = id;
+    }
+
+    public void addStudent_name (String name){
+        this.name = name;
+    }
+
+    public void addStudent_gender (String Uin){
+        if (Objects.equals(Uin, "男")){
+            this.gender = true;
+        }
+        if (Objects.equals(Uin, "女")){
+            this.gender = false;
+        }
+    }
+
+    public void addStudent_age (int a){
+        this.age = a;
+    }
+
+    public void addStudent_math (int a){
+        this.math = a;
+    }
+
+    public void addStudent_english (int a){
+        this.english = a;
+    }
+
+    public void addStudent_chinese (int a){
+        this.chinese = a;
+    }
+
+    public int getStudent_sum (){
+        return this.math + this.english + this.chinese;
+    }
+
+    public double getStudent_average (){
+        return (double) getStudent_sum() / 3;
+    }
+
+    public void getStudentInfo (){
+        System.out.println("Student ID: " + this.studentID);
+        System.out.println("Student Name: " + this.name);
+        System.out.print("Student Gender: ");
+        if (Objects.equals(this.gender, true)){
+            System.out.println("男");
+        } else{
+            System.out.println("女");
+        }
+        System.out.println("Student Age: " + this.age);
+        System.out.println("Student Sum: " + getStudent_sum());
+        System.out.println("Student Average: " + getStudent_average());
+    }
+
+    public static void main (String[] args){
+        student s1 = new student();
+
+        s1.addStudent_ID(1234);
+        s1.addStudent_name("dog meat");
+        s1.addStudent_gender("男");
+        s1.addStudent_age(15);
+
+        s1.addStudent_chinese(114);
+        s1.addStudent_english(5);
+        s1.addStudent_math(14);
+
+        s1.getStudentInfo();
+    }
+}
diff --git a/01_Intellij_Java_universal_20240419/untitled/src/javaAssignment_20240418/sumNum.java b/01_Intellij_Java_universal_20240419/untitled/src/javaAssignment_20240418/sumNum.java
new file mode 100644
index 0000000..ac421f9
--- /dev/null
+++ b/01_Intellij_Java_universal_20240419/untitled/src/javaAssignment_20240418/sumNum.java
@@ -0,0 +1,50 @@
+/*
+ *   Function: 二维数组和
+ *   Date: 2024 04 18
+ *   Code by: JRNitre
+ * */
+
+package javaAssignment_20240418;
+
+public class sumNum {
+    // 行
+    private int m;
+    // 列
+    private int n;
+    private int sum;
+
+    // 带参构造方法
+    public sumNum(int[][] array) {
+        this.m = array.length;
+        this.n = array[0].length;
+
+        int i, j;
+
+        for (i = 0; i < this.n; i++){
+            for (j = 0; j < this.m; j++){
+                this.sum += array[i][j];
+            }
+        }
+    }
+
+    public int getSum (){
+        return this.sum;
+    }
+
+    public int get_m (){
+        return this.m;
+    }
+
+    public int get_n (){
+        return this.n;
+    }
+
+    public static void main (String[] args){
+        int[][] s_array = {{1,2,3},{4,5,6},{7,8,9}};
+
+        sumNum s1 = new sumNum(s_array);
+
+        System.out.println("in " + s1.get_m() + " row and " + s1.get_n() + " column sum: ");
+        System.out.println(s1.getSum());
+    }
+}