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See gettitle: It's a String and the name of a method,

Where does the code use any of the get methods? It should use a method (book1.getTitle()) to access a class value and not access the class's...

What variable are you printing that has a null value? Where do you give that variable a value so that it is not null? If you don't assign it a value it will keep the null default value.

It is...