Fibonacci in Java

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package pkg5.pkg11.pkg3;

import java****.BufferedReader;
import java****.InputStreamReader; 
import java****.Console;
import java********Exception;
public class Principal {
    private static int seg;
/**
 Programa desenvlvido por wallyson Marcos
 * 06/04/2013
 */
     public static void main(String[] args) throws IOException {  
         BufferedReader entrada;
        entrada = new BufferedReader(new InputStreamReader(System.in));
        long Fn=0;  
        long Fn1=1;  
        long b=1;
        long ent;
        long cont = 0;
        int opc ;
       try{ 
            System.out.println("||=========================Menu of project===============================||");
            System.out.println("||Enter 1 to determine how far will the nth Fibonacci number.            ||");
            System.out.println("||Enter 2 to determine the count of the number nth.                  ||");
            System.out.println("||==================================================================||");
            opc = Integer.parseInt(entrada.readLine());
              switch(opc)
              {
                  case 1:{
                      System.out.println("Enter a number to determine how far will the nth Fibonacci number");
                                           ent = Integer.parseInt(entrada.readLine());
                      System.out.println("Its sequel: ");   
                      
                      for(int i=2;i<=1000;i++){            
                          System.out.println(Fn+";");
                          b=Fn;  
                          Fn=Fn+Fn1;  
                          Fn1=b;                             
                          if(Fn>ent){break;    
                          }                            
                      }
                      break;      
                  }  
                  case 2:{
                       System.out.println("Enter a number to determine the count of the number nth. : ");
                        ent = Integer.parseInt(entrada.readLine());
                      System.out.println("Its sequel: ");
                      for(int i=1;i<=ent;i++){            
                          System.out.println(Fn+";"+"  Contador: "+i);
                          b=Fn;  
                          Fn=Fn+Fn1;  
                          Fn1=b; 
                      }
                  }  
                  break;
                  default:
                      System.out.println("Enter the correct option!");
                      
                      }
     
            
    } catch (Exception e){
            System.out.println("Enter a correct value!");
     }
     }

}