IndexOutOfBoundsException error

Question

public void thisisnotworking()
{
    Scanner input=new Scanner(System.in);
    String cardA;
    String cardB;
    System.out.print(\"Enter Card: \"); cardA=input.nextLi         


        

Answer 1

It's hard to say without seeing game, but seems like cardA and cardB are not in game, so game.indexOf(cardA) returns -1 and game.get(-1) throws the exception.

Also, looking at your code, you search for String in game, and then takes an element from game, which is a String and assigns it to a Card object. You cannot cast from String to any other class than Object, since String is a final class.

Answer 2

Where do you set the cards into the game? If there is no code missing that might be it, you need to call

game.set(cardA); 
game.set(cardB);

before game.get(...);

Answer 3

Try this...

public void thisshouldwork()
{
    Scanner input=new Scanner(System.in);
    String cardA;
    String cardB;
    System.out.print("Enter Card: "); cardA=input.nextLine();
    System.out.print("Enter Card "); cardB=input.nextLine();
    game.add(cardA);
    game.add(cardB);
    Card a = game.get(game.indexOf(cardA));
    Card b = game.get(game.indexOf(cardB));

The problem is you aren't adding cardA or cardB to game so indexOf returns -1 and get throws an IndexOutOfBounds Exception

Answer 4

You must cast the return value of the readLine method to an Object, and then call the toString() method:

cardA=((Object)in.readLine()).toString();