Need recommendation about Algorithm books in Java

Need recommendation about Algorithm books in Java

Can anybody recommend some easy-to-read and easy-to-understand algorithms
books in JAVA.
I used to read 'Algorithms' by Robert Sedgewick but there's no answers to
the questions at the end of each chapter, I don't know where to verify my
answers right or not, therefore I give up reading it after finishing the
first chapter. If you recommend, could you please recommend books with
answers to the questions or experiments at the end of each chapter.
thanks