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
index 52a5438..3c0e123 100644
--- a/01_Intellij_Java_universal_20240419/untitled/src/javaAssignment_20240418/box.java
+++ b/01_Intellij_Java_universal_20240419/untitled/src/javaAssignment_20240418/box.java
@@ -1,5 +1,5 @@
 /*
- *   Function: 盒子类
+ *   Function: 创建 盒子 类
  *   Date: 2024 04 18
  *   Code by: JRNitre
  * */
@@ -7,30 +7,33 @@
 package javaAssignment_20240418;
 
 public class box {
-    double length;
-    double width;
-    double height;
+    private double length;
+    private double width;
+    private double height;
 
     public void setBox_length (double l){
-        length = l;
+        this.length = l;
     }
     public void setBox_width (double w){
-        width = w;
+        this.width = w;
     }
     public void setBox_height (double h){
-        height = h;
+        this.height = h;
     }
     public void printVolume(){
         System.out.println(height * width * length);
     }
 
     public static void main (String[] args){
+        // 实例化 box 类
         box b_1 = new box();
 
+        // 赋值
         b_1.setBox_height(5);
         b_1.setBox_length(2);
         b_1.setBox_width(3);
 
+        // 输出体积
         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
index 5194ef3..3dd9cd4 100644
--- a/01_Intellij_Java_universal_20240419/untitled/src/javaAssignment_20240418/complex.java
+++ b/01_Intellij_Java_universal_20240419/untitled/src/javaAssignment_20240418/complex.java
@@ -1,5 +1,5 @@
 /*
- *   Function: 虚数和
+ *   Function: 创建类计算两个虚数和
  *   Date: 2024 04 18
  *   Code by: JRNitre
  * */
@@ -23,6 +23,7 @@ public class complex {
         this.imaginePart = i;
     }
 
+    // 计算两个虚数和
     public complex complexAdd (complex a){
         complex temp = new complex();
         temp.realPart = this.realPart + a.realPart;
@@ -30,6 +31,7 @@ public class complex {
         return temp;
     }
 
+    // 返回计算结果 String
     public String ToString (){
         return this.realPart + " + " + this.imaginePart + "i";
     }
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
index ac421f9..8d34fe1 100644
--- a/01_Intellij_Java_universal_20240419/untitled/src/javaAssignment_20240418/sumNum.java
+++ b/01_Intellij_Java_universal_20240419/untitled/src/javaAssignment_20240418/sumNum.java
@@ -11,6 +11,7 @@ public class sumNum {
     private int m;
     // 列
     private int n;
+    // 和
     private int sum;
 
     // 带参构造方法
@@ -27,6 +28,11 @@ public class sumNum {
         }
     }
 
+    /**
+     * Retrieves the sum value.
+     *
+     * @return         the sum value
+     */
     public int getSum (){
         return this.sum;
     }
diff --git a/01_Intellij_Java_universal_20240419/untitled/src/javaAssignment_20240510/thread.java b/01_Intellij_Java_universal_20240419/untitled/src/javaAssignment_20240510/thread.java
new file mode 100644
index 0000000..f73be5d
--- /dev/null
+++ b/01_Intellij_Java_universal_20240419/untitled/src/javaAssignment_20240510/thread.java
@@ -0,0 +1,47 @@
+/*
+ *   Function: Java 多线程
+ *   Date: 2024 05 10
+ *   Code by: JRNitre
+ * */
+
+package javaAssignment_20240510;
+
+class myThread extends Thread{
+    // 成员变量
+    private String who;
+    // 构造方法
+    public myThread(String who){
+        super();
+        this.who = who;
+    }
+
+    public myThread(){
+        super();
+    }
+
+    // 覆盖 run 方法
+    public void run(){
+        for (int i = 0; i < 5; i++){
+            try{
+                sleep(1000);
+            }
+            catch (InterruptedException e){
+
+            }
+            System.out.println(who + "is running");
+        }
+    }
+}
+
+public class thread {
+    public static void main(String[] args){
+        // 创建线程
+        myThread test01Thread = new myThread("test01_Thread");
+        myThread test02Thread = new myThread("test02_Thread");
+
+        test01Thread.start();
+        test02Thread.start();
+
+        System.out.println("system out");
+    }
+}
diff --git a/01_Intellij_Java_universal_20240419/untitled/src/javaAssignment_20240514/bus.java b/01_Intellij_Java_universal_20240419/untitled/src/javaAssignment_20240514/bus.java
new file mode 100644
index 0000000..afb158a
--- /dev/null
+++ b/01_Intellij_Java_universal_20240419/untitled/src/javaAssignment_20240514/bus.java
@@ -0,0 +1,8 @@
+package javaAssignment_20240514;
+
+public class bus implements charge{
+    @Override
+    public void charge() {
+        System.out.println("publicBus: 1$/sheet, No Limit Kilometer");
+    }
+}
diff --git a/01_Intellij_Java_universal_20240419/untitled/src/javaAssignment_20240514/charge.java b/01_Intellij_Java_universal_20240419/untitled/src/javaAssignment_20240514/charge.java
new file mode 100644
index 0000000..ca854d0
--- /dev/null
+++ b/01_Intellij_Java_universal_20240419/untitled/src/javaAssignment_20240514/charge.java
@@ -0,0 +1,5 @@
+package javaAssignment_20240514;
+
+public interface charge {
+    public void charge();
+}
diff --git a/01_Intellij_Java_universal_20240419/untitled/src/javaAssignment_20240514/cinema.java b/01_Intellij_Java_universal_20240419/untitled/src/javaAssignment_20240514/cinema.java
new file mode 100644
index 0000000..265f974
--- /dev/null
+++ b/01_Intellij_Java_universal_20240419/untitled/src/javaAssignment_20240514/cinema.java
@@ -0,0 +1,13 @@
+package javaAssignment_20240514;
+
+public class cinema implements play, charge {
+    @Override
+    public void play() {
+        System.out.println("Now Showing");
+    }
+
+    @Override
+    public void charge() {
+        System.out.println("Cinema: 30$/sheet, Student half");
+    }
+}
diff --git a/01_Intellij_Java_universal_20240419/untitled/src/javaAssignment_20240514/goods.java b/01_Intellij_Java_universal_20240419/untitled/src/javaAssignment_20240514/goods.java
new file mode 100644
index 0000000..8d098a1
--- /dev/null
+++ b/01_Intellij_Java_universal_20240419/untitled/src/javaAssignment_20240514/goods.java
@@ -0,0 +1,19 @@
+package javaAssignment_20240514;
+
+public class goods {
+    private String goodsName;
+
+    public goods(String name){
+        this.goodsName = name;
+    }
+
+    // 返回商品名
+    public String getName(){
+        return this.goodsName;
+    }
+
+    // 设置商品名
+    public void setName(String name){
+        this.goodsName = name;
+    }
+}
diff --git a/01_Intellij_Java_universal_20240419/untitled/src/javaAssignment_20240514/market.java b/01_Intellij_Java_universal_20240419/untitled/src/javaAssignment_20240514/market.java
new file mode 100644
index 0000000..708357a
--- /dev/null
+++ b/01_Intellij_Java_universal_20240419/untitled/src/javaAssignment_20240514/market.java
@@ -0,0 +1,30 @@
+package javaAssignment_20240514;
+
+public class market {
+    private String marketName;
+    private String marketGoodsList;
+
+    public market(String name){
+        this.marketName = name;
+    }
+
+    public String getName(){
+        return this.marketName;
+    }
+
+    public void setName(String name){
+        this.marketName = name;
+    }
+
+    public void getGoodsList(){
+        System.out.println(this.marketGoodsList);
+    }
+
+    public void setGoodsList(String goodlist){
+        this.marketGoodsList = goodlist;
+    }
+
+    public String sell(){
+        return "yee~";
+    }
+}
diff --git a/01_Intellij_Java_universal_20240419/untitled/src/javaAssignment_20240514/person.java b/01_Intellij_Java_universal_20240419/untitled/src/javaAssignment_20240514/person.java
new file mode 100644
index 0000000..1389b2a
--- /dev/null
+++ b/01_Intellij_Java_universal_20240419/untitled/src/javaAssignment_20240514/person.java
@@ -0,0 +1,23 @@
+package javaAssignment_20240514;
+
+public class person {
+    // 姓名
+    private String personName;
+    // 性别
+    private String personGender;
+    // 年龄
+    private int personAge;
+
+    public person(String name, String gender, int age){
+        this.personName = name;
+        this.personGender = gender;
+        this.personAge = age;
+    }
+
+    public String getInfo(){
+        String bunchInfo;
+        bunchInfo = this.personName + "-" + this.personGender + "-" + this.personAge;
+        return bunchInfo;
+    }
+}
+
diff --git a/01_Intellij_Java_universal_20240419/untitled/src/javaAssignment_20240514/person_no3.java b/01_Intellij_Java_universal_20240419/untitled/src/javaAssignment_20240514/person_no3.java
new file mode 100644
index 0000000..96f1cd5
--- /dev/null
+++ b/01_Intellij_Java_universal_20240419/untitled/src/javaAssignment_20240514/person_no3.java
@@ -0,0 +1,17 @@
+package javaAssignment_20240514;
+
+public class person_no3 {
+    private String personName;
+
+    public String getName(){
+        return this.personName;
+    }
+
+    public void setName(String name){
+        this.personName = name;
+    }
+
+    public void shopping(){
+        System.out.println("rob");
+    }
+}
diff --git a/01_Intellij_Java_universal_20240419/untitled/src/javaAssignment_20240514/play.java b/01_Intellij_Java_universal_20240419/untitled/src/javaAssignment_20240514/play.java
new file mode 100644
index 0000000..d10baa2
--- /dev/null
+++ b/01_Intellij_Java_universal_20240419/untitled/src/javaAssignment_20240514/play.java
@@ -0,0 +1,5 @@
+package javaAssignment_20240514;
+
+public interface play {
+    public void play();
+}
diff --git a/01_Intellij_Java_universal_20240419/untitled/src/javaAssignment_20240514/student.java b/01_Intellij_Java_universal_20240419/untitled/src/javaAssignment_20240514/student.java
new file mode 100644
index 0000000..a769524
--- /dev/null
+++ b/01_Intellij_Java_universal_20240419/untitled/src/javaAssignment_20240514/student.java
@@ -0,0 +1,42 @@
+package javaAssignment_20240514;
+
+public class student extends person {
+    // 学号
+    private int studentID;
+    // 哲学成绩
+    private int studentPhilosophyScore;
+    // 英语成绩
+    private int studentEnglishScore;
+    // 计算机成绩
+    private int studentComputerScore;
+
+    // 构造函数
+    public student(String name, String gender, int age, int id, int philosophy, int english, int computer) {
+        super(name, gender, age);
+        this.studentID = id;
+        this.studentPhilosophyScore = philosophy;
+        this.studentEnglishScore = english;
+        this.studentComputerScore = computer;
+    }
+
+    // 三门课平均成绩
+    public int aver(){
+        return (this.studentPhilosophyScore + this.studentEnglishScore + this.studentComputerScore) / 3;
+    }
+
+    // 最高分
+    public double max(){
+        return Math.max(Math.max(this.studentComputerScore, this.studentEnglishScore), this.studentPhilosophyScore);
+    }
+
+    // 最低分
+    public int min(){
+        return Math.min(Math.min(this.studentComputerScore, this.studentPhilosophyScore), this.studentEnglishScore);
+    }
+
+    public String getInfo(){
+        String bunchInfo;
+        bunchInfo = this.studentID + "-" + super.getInfo() + "-" + aver() + "-" + max() + "-" + min();
+        return  bunchInfo;
+    }
+}
diff --git a/01_Intellij_Java_universal_20240419/untitled/src/javaAssignment_20240514/taxi.java b/01_Intellij_Java_universal_20240419/untitled/src/javaAssignment_20240514/taxi.java
new file mode 100644
index 0000000..f6e6299
--- /dev/null
+++ b/01_Intellij_Java_universal_20240419/untitled/src/javaAssignment_20240514/taxi.java
@@ -0,0 +1,8 @@
+package javaAssignment_20240514;
+
+public class taxi implements play{
+    @Override
+    public void play() {
+        System.out.println("Taxi: 1.6$/Kilometer, Starting 3 Kilometer");
+    }
+}
diff --git a/01_Intellij_Java_universal_20240419/untitled/src/javaAssignment_20240514/test.java b/01_Intellij_Java_universal_20240419/untitled/src/javaAssignment_20240514/test.java
new file mode 100644
index 0000000..fbb1ca6
--- /dev/null
+++ b/01_Intellij_Java_universal_20240419/untitled/src/javaAssignment_20240514/test.java
@@ -0,0 +1,58 @@
+package javaAssignment_20240514;
+
+public class test{
+
+    /*
+     * class:
+     *      person.java
+     *      student.java
+    public static void main (String[] args){
+        student s1 = new student("test", "man", 10, 101, 80, 60, 50);
+
+        System.out.println(s1.getInfo());
+    }
+    */
+
+    /*
+     * interface:
+     *      charge.java
+     *      play.java
+     * class:
+     *      bus.java
+     *      taxi.java
+     *      cinema.java
+    public static void main (String[] args){
+        cinema c1 = new cinema();
+
+        c1.charge();
+        c1.play();
+
+        bus b1 = new bus();
+        b1.charge();
+
+        taxi t1 = new taxi();
+        t1.play();
+    }
+    */
+
+    public static void main (String[] args){
+        goods g1 = new goods("black_man");
+
+        System.out.println(g1.getName());
+        g1.setName("rainbow_main");
+
+        market m1 = new market("limit");
+
+        System.out.println(m1.getName());
+        m1.setName("no limit");
+        m1.setGoodsList("one black_man - two black_man - three black-man");
+        m1.getGoodsList();
+        System.out.println(m1.sell());
+
+        person_no3 pn1 = new person_no3();
+
+        System.out.println(pn1.getName());
+        pn1.setName("todd");
+        pn1.shopping();
+    }
+}