Encapsulation and Data Hiding

class student
{
int RollNo;
String name;
private int age;

public void setAge(int a)
{
if(a>=10&& a<=20)
age=a;
else
age=12;
}

public int GetAge()
{
return age;
}
}

class TestStudent
{
public static void main(String args[])
{
student s1=new student();
s1.setAge(200);
System.out.println("Age of the student"+s1.GetAge());
}
}