Solution Review: Implement the Complete Student Class

// Student Class
class Student {
  // Private Fields
  private String name;
  private String rollNumber;
  public Student(){
    name = "Unknown";
    rollNumber = "N/A";
  }
  // getter function for name
  public String getName() {
    return name;  
  }
  // setter function for name
  public void setName(String x) {
    this.name = x;
  }
  // getter function for roll number
  public String getRollNumber() {
    return this.rollNumber;  
  }
  // setter function for roll number
  public void setRollNumber(String x) {
    this.rollNumber = x;
  }
}
public class main
{
	public static void main(String[] args) {
    Student x = new Student();
    System.out.println(x.getName());
    x.setName("Samantha");
    String student_name = x.getName();
    System.out.println(student_name);
    System.out.println(x.getRollNumber());
    x.setRollNumber("2211");
    String student_rollnum = x.getRollNumber();
    System.out.println(student_rollnum);
   
	}
}