Java How to Program by Deitel: Early vs. Late Object Versions Explained

The early object version of 'Java How to Program' by Deitel was written for Java versions 1.0-1.2 and focused on traditional procedural programming with some object-oriented concepts introduced later. The late object version, on the other hand, was written for Java versions 5 and 6 and placed a stronger emphasis on object-oriented programming from the beginning, with a focus on modern programming practices and technologies. The late object version also includes more advanced topics such as generics and concurrency.