The java classes for testing.

testclass.java

import java.util.*;
 class Student {   // Initialising the main class
    int studentage;
    public Student(String name) {
        System.out.println("Name choosen is : " + name);

    }
    public void setAge(int age) {
       
        studentage = age;
    }
    public int getAge() {
        System.out.println("Student's age is : " + studentage);
        return studentage;
    }
    public static void main(String[] args) {
        Student myStudent = new Student("Hoang Minh Hieu");
       // myStudent.getName = "Hoang Minh Hieu";
        myStudent.setAge(18);
        myStudent.getAge();
       
        Student myStudent2 = new Student("Hoang Van Dung");
        myStudent2.setAge(22);
        myStudent2.getAge();

    }
 }