different instant variable of same class

Hai all

is the values are storing statically and why???????????????

if you run the programme it willl give the output

Name : Anna
Name : Beah
Name : Cris
Id : 1
Name : Cris
Grade : 32.1
Id : 2
Name : Cris
Grade : 32.1
Id : 3
Name : Cris
Grade : 32.1

see the name and grade is setting as static why????????

Q 2)
another programme

public class Testings {

public static void main (String[] args) {
X xx;
X yy;
X zz;
xx=new X();
yy=new X();
zz=new X();
xx.setStudentId(5);
yy.setStudentId(10);
zz.setStudentId(15);
System.out.println (xx.getStudentId());

System.out.println (yy.getStudentId());

System.out.println (zz.getStudentId());
System.out.println (xx.getStudentId());

}

}

class X {

private int studentId;
public int getStudentId()
{
return studentId;
}

/**
* Changes the value of studentId
*/
public void setStudentId(int studentId)
{

this.studentId = studentId;
}

}

the out put is

5
10
15
5

why is like this though the setting is done to a single private int studentId; but done by different instant variable of same class
i'm confused please explain correctly if any on can

thanks