Data Structures and Algorithms in Java

Elements of Programming Interviews in Java: The Insiders' Guide

GWT in Practice

Effective Software Testing: A developer's guide

Learn Java the Easy Way: A Hands-On Introduction to Programming

Optimizing Cloud Native Java: Practical Techniques for Improving JVM Application Performance

Java: Learn Java in One Day and Learn It Well. Java for Beginners with Hands-on Project. (Learn Coding Fast with Hands-On Project)

Modern Java in Action: Lambdas, streams, functional and reactive programming

Java All-in-One For Dummies

Java Generics and Collections: Fundamentals and Recommended Practices