Question

I have a HashMap. I am trying to retrieve the value and print it using the key from the user-code.

The code is:

lib.addbook(book2.getISBN(), book2);
Book ret = lib.getbook("978-81-291-1979-7");
System.out.println(ret);

Current Output:

O/P: LibraryPackage.Book@527c6768

I want the output to be a string and to display the actual value not the address of the book.

Answer 1

You have to implement (and override) the toString() method in your Book class, and specify what you want the output to be. E.g.:

@Override
String toString()
{
  return this.author+": " + this.title;
}