// ---- EmployeeComparator.java
package EmployeeLL;
import java.util.Comparator;    

public class EmployeeComparator implements Comparator
{
  /** Compares two strings by converting both objects 
   * <code>{@link java.lang.Object#toString()}</code> 
   * and then <code>{@link java.lang.String#toUpperCase()}</code>, and
   * compared using <code>{@link java.lang.String#compareTo} method. 
   * @return the result of <code>{@link java.lang.String#compareTo}</code>
   */
  public int compare(Object o1, Object o2)
  {
    String s1 = o1.toString().toUpperCase();
    String s2 = o2.toString().toUpperCase();
    return s1.compareTo(s2);
  }
}


// ---- Main.java
...
Collections.sort(Employee, new EmployeeComparator());
...


// ---- Employee.java
...
String LastName;
String FirstName;
String EmpSocial;
String EmpID;
String EmpSalary;

....