diff --git a/src/class15/constructor/Student.java b/src/class15/constructor/Student.java
new file mode 100644
index 0000000..35f8a4e
--- /dev/null
+++ b/src/class15/constructor/Student.java
@@ -0,0 +1,21 @@
+package class15.constructor;
+
+public class Student {
+    String name;
+    int age;
+    char sex;
+    public Student(){
+        System.out.println("无参构造方法");
+    }
+    public Student(String n){
+        System.out.println("有参构造方法");
+        name = n;
+    }
+    public Student(String n ,int a,char s){
+        System.out.println("有参构造方法");
+        name = n;
+        age = a;
+        sex = s;
+    }
+
+}
diff --git a/src/class15/constructor/Test.java b/src/class15/constructor/Test.java
new file mode 100644
index 0000000..3c391df
--- /dev/null
+++ b/src/class15/constructor/Test.java
@@ -0,0 +1,26 @@
+package class15.constructor;
+
+public class Test {
+    public static void main(String[] args) {
+        Student s1 = new Student();
+        Student s2 = new Student("小王");
+        System.out.println(s1.name);
+        System.out.println(s2.name);
+        System.out.println("==========");
+
+
+        Student t1 = new Student();
+        t1.name = "石轩";
+        t1.age = 18;
+        t1.sex = '男';
+        System.out.println(t1.name);
+        System.out.println(t1.age);
+        System.out.println(t1.sex);
+
+        System.out.println("==========");
+        Student t2 = new Student("d老师", 18,'男');
+        System.out.println(t2.name);
+        System.out.println(t2.age);
+        System.out.println(t2.sex);
+    }
+}
diff --git a/src/class15/object/Student.java b/src/class15/object/Student.java
new file mode 100644
index 0000000..b1eef17
--- /dev/null
+++ b/src/class15/object/Student.java
@@ -0,0 +1,13 @@
+package class15.object;
+
+public class Student {
+    String name;
+    double chinese;
+    double math;
+    public void printAllScore(){
+        System.out.println(name+"的总成绩是："+(chinese+math));
+    }
+    public void printAverageScore(){
+        System.out.println(name+"的平均成绩是："+(chinese+math)/2);
+    }
+}
diff --git a/src/class15/object/Test2.java b/src/class15/object/Test2.java
new file mode 100644
index 0000000..39289cf
--- /dev/null
+++ b/src/class15/object/Test2.java
@@ -0,0 +1,20 @@
+package class15.object;
+
+public class Test2 {
+    public static void main(String[] args) {
+        Student s1 = new Student();
+        s1.name = "波妞";
+        s1.chinese = 100;
+        s1.math = 100;
+        s1.printAllScore();
+        s1.printAverageScore();
+
+        Student s2 = new Student();
+        s2.name = "小王";
+        s2.chinese = 100;
+        s2.math = 100;
+        s2.printAllScore();
+        s2.printAverageScore();
+    }
+
+}