refactor

school/Student.java

@@ -0,0 +1,23 @@
+package school;
+
+public class Student extends Person {
+    private String studentID;
+
+    public Student(String name, int age, String studentID) {
+        super(name, age);
+        this.studentID = studentID;
+    }
+
+    public void speak() {
+        System.out.println("I am a student, my name is " + getName() + ", and I am " + getAge()
+                + " years old. My student ID is " + studentID + ".");
+    }
+
+    public String getStudentID() {
+        return studentID;
+    }
+
+    public void setStudentID(String studentID) {
+        this.studentID = studentID;
+    }
+}