Nrthugu

I have a text file from which I've created an Array list. Each line = one element of collection. Is there any way to find a specific word in that line, and if it's found, output that line to console?
Right now that part of my code looks somewhat like this:

protected static void FindBook() {

    System.out.print("Author's name: ");

    String neededauthor = sc.nextLine();

    for (int k=0; k<=books.size(); k++) {

        if (books.get(k).contains(neededauthor)) 

            System.out.println(books.get(k)); 

    }

}

But it's giving me

Exception in thread "main" java.lang.IndexOutOfBoundsException: Index: 0, Size: 0

Update: I've tried to fix it, and now the exception is gone, but it doesn't work either. After I enter the name, the method stops working and just doesn't do anything, where it should output that line. I don't understand what the matter is

As the other anwers already say, there is a problem when accessing an index that is not there:

books.get(books.size())

The index runs from 0 to size()-1, so size() is out of bounds.

You can avoid the index completely and make your code simpler by using a foreach loop like this:

for (Book book: books)

    if (book.contains(neededauthor)) 

        System.out.println(book);

I assumed that the type of books is some collection of type Book.

I think your code looks correct, but there is one problem.

for (int k=0; k<=books.size(); k++) {

If k starts at 0, it cannot be equal to books.size(), because that would mean that it will go through the for loop one more time than there are elements in books.size().

Try changing it to for (int k = 0; k < books.size(); k++) {

Besides that, if your ArrayList books has values in it, your code should work.

Use this part k<books.size() instead of k<=books.size() it should be only less than. Not less than and equal. Also change your method name to findBook() since its not following Java camel notation