Error in calling method ?

Question

Class Student has feilds(Name,Address,ID)
Class addmisions is to add and delete instances of Student from an arrayList
I get the following error message on this line- if(s.getID().equal(id))
Addmisions.java:43: cannot find symbol
symbol : method getID()
location: class Student
if(s.getID().equal(id))
(I am a begginer) My question is do I have to write a Method named getID in the class Student or Addmisions? If so How is that written ?
Here are my classes... Student & Addmisions
import java.util.Date;
public class Student
Name name;
Address addr;
String ID;
Date date;
Student(Name n,Address a,String id)
{ name = n;
addr = a;
ID = id;
date = new Date();
// name.getLastName();
import java.util.ArrayList;
public class Addmisions
ArrayList list; //member variables
int index;
Addmisions() //constructor
list = new ArrayList();
void add(Student s) //methods
list.add(s);
boolean Empty()
{return list.isEmpty();
int getindex()
return index;
Object removeItem (int i)
return list.remove(i);
boolean inList(String id)
int i = 0;
boolean found = false;
while(i<list.size() && !found)
{ Object o = list.get(i);
if (o instanceof Student)
{  Student s = (Student)o;
if(s.getID().equal(id))
     { found = true;}
     else i++;      
     }// if o
}//while
index = i;
return found;
}//inList
} //addmision

Answer 1

SAME QUESTION FORMATTED....
Class Student has feilds(Name,Address,ID)
Class addmisions is to add and delete instances of Student from an arrayList
I get the following error message on this line- if(s.getID().equal(id))
Addmisions.java:43: cannot find symbol
symbol : method getID()
location: class Student
if(s.getID().equal(id))
(I am a begginer) My question is do I have to write a Method named getID in the class Student or Addmisions? If so How is that written ?
Here are my classes... Student & Addmisions
import java.util.Date;
public class Student
Name name;
Address addr;
String ID;
Date date;
Student(Name n,Address a,String id)
{ name = n;
addr = a;
ID = id;
date = new Date();
// name.getLastName();
import java.util.ArrayList;
public class Addmisions
ArrayList list; //member variables
int index;
Addmisions() //constructor
list = new ArrayList();
void add(Student s) //methods
list.add(s);
boolean Empty()
{return list.isEmpty();
int getindex()
return index;
Object removeItem (int i)
return list.remove(i);
boolean inList(String id)
int i = 0;
boolean found = false;
while(i<list.size() && !found)
{ Object o = list.get(i);
if (o instanceof Student)
{ Student s = (Student)o;
if(s.getID().equal(id))
{ found = true;}
else i++;
}// if o
}//while
index = i;
return found;
}//inList
} //addmision>