1. import java.util.*;
  2. import java.io.*;
  3.  
  4. class a1 {
  5.  
  6. 	static LinkedList l1;
  7. 	private	emp_struct input() throws IOException
  8. 	{
  9. 		BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
  10. 		emp_struct obj = new emp_struct();
  11. 		obj.emp_id = br.readLine();
  12. 		obj.name =  br.readLine();
  13. 		obj.salary = Double.parseDouble(br.readLine());
  14. 		obj.dept = br.readLine();
  15. 		try{
  16. 			search(obj);
  17. 		}catch(Exception e){
  18. 			System.out.println(e);
  19. 			obj = input();
  20. 		}
  21. 		return obj;
  22.  
  23. 	}
  24.  
  25. 	boolean search(emp_struct obj)
  26. 	{
  27. 		int lastIndex = l1.lastIndexOf(l1);
  28. 		int begIndex = 0;
  29. 		for(begIndex =0;begIndex<lastIndex;begIndex++)
  30. 		{
  31. 			Object chkCase = l1.get(begIndex);
  32. 			String chk = chkCase.getEmpID();
  33. 			if(chk.equals(obj.emp_id));
  34. 				throw new DuplicateEntryException("Duplicate entry found");
  35.  
  36. 		}			
  37. 		return true;
  38. 	}
  39. 	public static void main(String args[]) throws IOException
  40. 	{
  41. 		l1 = new LinkedList();
  42. 	}
  43. }
  44.  
  45. class DuplicateEntryException extends Exception {
  46. 	String detail;
  47. 	DuplicateEntryException(String a)
  48. 	{
  49. 		detail = a;
  50. 	}
  51.  
  52. 	public String toString()
  53. 	{
  54. 		return "User Defined Exception : "+detail;
  55. 	}
  56. }
  57.  
  58. class emp_struct {
  59. 	public String emp_id;
  60. 	public String name;
  61. 	public double salary;
  62. 	public String dept;
  63.  
  64. 	public String getEmpID()
  65. 	{
  66. 		return emp_id;
  67. 	}
  68.  
  69. 	public String toString()
  70. 	{
  71. 		return emp_id+"\t"+name+"\t"+salary+"\t"+dept;
  72. 	}
  73. }
  74.