خطأ في هذا الكود ما هو الخطأ؟

public class MainClass {

public static void main(String args[])
{

System.out.println();
System.out.println();
System.out.println("=========================================");
System.out.println("= 1-Add Applicant =");
System.out.println("= 2-Add student =");
System.out.println("= =");
System.out.println("= 1/New Applicant =");
System.out.println("= 2/Delete =");
System.out.println("= 3/Change Information =");
System.out.println("= 4/print Applicant =");
System.out.println("= 5/print all Applicant =");
System.out.println("=========================================");
System.out.println();
System.out.println();

int n,c,i;
String co,N,na,ad,q,d;

Array_O u=new Array_O();
AppLinked a=new AppLinked();
AppNode A=new AppNode();
Applicant A1=new Applicant();

Scanner s = new Scanner(System.in);

System.out.println("=========================================");
System.out.println("= Enter Your Choice =");
System.out.println("=========================================");
System.out.println();
System.out.println();
n=s.nextInt();
switch(n)
{
case 1:u.newArray();
break;
case 2:
{
System.out.println("=========================================");
System.out.println("= Enter Your Choice =");
System.out.println("=========================================");
System.out.println();
System.out.println();

c=s.nextInt();
switch(c)
{
case 1:
{
System.out.println("=======================================================");
System.out.println("= country & university name =");
System.out.println("=======================================================");
co=s.next();
N=s.next();
System.out.println();
System.out.println();
System.out.println("=======================================================");
System.out.println("= Enter New Applicant =");
System.out.println("=======================================================");
System.out.println();
System.out.println();

System.out.println();
System.out.println("*your Id*");
System.out.println();
A1.id=s.nextInt();
System.out.println();
System.out.println();
System.out.println();
System.out.println("* your Name: *");
System.out.println();
A1.name=s.next();
System.out.println();
System.out.println();
System.out.println();
System.out.println("* your Address: *");
System.out.println();
A1.Address=s.next();
System.out.println();
System.out.println();
System.out.println();
System.out.println("* your Qualification: *");
System.out.println();
A1.Qualification=s.next();
System.out.println();
System.out.println();
System.out.println();
System.out.println("* your Department: *");
System.out.println();
A1.Department=s.next();
System.out.println();
System.out.println();
a.addApplicant(A1,co,N,A,A1.id);
}
break;
case 2:
a.delete();
break;
case 3:
a.change();
break;
case 4:
a.print();
break;
case 5:
a.printAll();
break;
}
}
}
}
}

 import java.util.Scanner;