Java program help

package lists;

/**

*

* @author

*/

import java.util.* ;

public class ListMain {

public static void main(String[]args){

int choice=0;

Scanner scanner=new Scanner(System.in);

List<Animal> list=new ArrayList<Animal>();

int pos;

while(choice!=5){

printMenu();

System.out.print("Choose a number");

choice=scanner.nextInt();

switch(choice){

case 1:

addOrEditAnimal(list, -1,scanner);

break;

case 2:

int i=0;

for(Animal a:list){

i++;

System.out.println(i+" "+a.toString());

}

break;

case 3:

int j=0;

for(Animal a:list){

j++;

System.out.println(j+" "+a.toString());

}

System.out.println("Select position to edit");

pos=scanner.nextInt();

if(pos>0 && pos<=list.size()){

addOrEditAnimal(list, pos,scanner);

}else{

System.out.println("Animal at the given position not found");

}

break;

case 4:

int j3=0;

for(Animal a:list){

j3++;

System.out.println(j3+" "+a.toString());

}

System.out.println("Select position to delete");

pos=scanner.nextInt();

if(pos>0 && pos<=list.size()){

list.remove(pos-1); //Actual position is index-1

}else{

System.out.println("Animal at the given position not found,could not delete");

}

break;

case 5:

System.out.println("Bye");

break;

default:

System.out.println("Invalid choice <<"+choice+">>");

}

}

scanner.close();

}

/**

* Prints a list or options for user to select from

*/

public static void printMenu(){

System.out.println("1. Add animal");

System.out.println("2. List animal");

System.out.println("3. Edit animal");

System.out.println("4. Delete");

System.out.println("5. Exit");

}

/**

* Used to add or edit animal

* @param list list to add or edit animal in

* @param position negative for new and animal position for edit

* @param sc Scanner to read input

*/

public static void addOrEditAnimal(List<Animal> list,int position,Scanner sc){

Animal animal;

String value="";

sc.nextLine();

boolean v;

if(position>0){

animal=list.get(position-1);

System.out.println("NB:Press ENTER to skip change");

System.out.println("Animal name:");

value=sc.nextLine();

if(value.length()>0)

animal.setName(value);

System.out.println("Animal color:");

value=sc.nextLine();

if(value.length()>0)

animal.setColor(value);

System.out.println("Vertebrate(V) or invertebrate(I)");

value=sc.nextLine();

if(value.length()>0)

animal.setType(value);

System.out.println("Animal can swim?(Yes/No)");

value=sc.nextLine();

if(value.length()>0){

v=value.startsWith("y");

animal.setCanSwim(v);

}

}else{

animal=new Animal();

System.out.println("Animal name:");

value=sc.nextLine();

animal.setName(value);

System.out.println("Animal color:");

value=sc.nextLine();

animal.setColor(value);

System.out.println("Vertebrate(V) or invertebrate(I)");

value=sc.nextLine();

animal.setType(value);

System.out.println("Animal can swim?(Yes/No)");

value=sc.nextLine();

v=value.startsWith("y");

animal.setCanSwim(v);

list.add(animal);

}

}

}