Wow. This was a surprisingly challenging class. In the best of ways though. Some of the questions in the quizzes need some rewriting to clarify, but still very fantastic overall.

The homework is really helpful to master data structure in Java, while some of it is redundant. Learning this course takes more time than I expected, but it gives me a solid basis.

W​hat a joy to finish this module. I realy enjoyed a lot to solve the project. Thank you coursera and Duke university to provide so much resources to test run the program.

This is a very nice course. The teachers speak clearly and explain very well. The subject used to teach Java (cryptography) is interesting. Many thanks!

Kind regards, Wim

It was very helpul in knowing the concepts of Caeser Cipher and how can we implement in our daily use.So that the information hacked by the hackers may get reduced.

Fun course, well-designed curriculum. Imaginative, real-world inspired assignments with just the right level of guidance. The instructors are skilled and personable.

This is my second Duke course, i'll take them all they are great. And i like the feel when i finish it. I'm still a student, i finish one course every two weeks.

learned so much during this course. i never thought i'd be able to break the Vigenere cipher and i'm so glad that i was able to. thank you so much, instructors!

Codebreaking made the homework quite engaging, and the lectures and coursework made sense. Week3 is a little heavier than the other weeks, so bear than in mind!

This course is challenging with quite heavy projects and exercises. However, I enjoyed it as I could learn a great deal of things about Java from this course.

Thanks professors from Duke University and this course for having me a chance to explore new knowledge about Java programming, specifically data structure.

I'm short of words, it was just awesome!!! Nice course materials and explanations. I particularly loved the programming experience, it was just FUN!!!

Another great course in the Java Object Oriented Programming track. Definitely would recommend to other people trying to learn Java ahead of uni etc.

Very interesting course with with plenty of really good assignments. Not so complicated, but still very useful for everyone, who starts learning Java

Thanks for the great course. But it would be very usefull to specify some of time the student spend studying to pass the course in the certification.

Very nice course for beginning java learner, specific the seven steps to design a program. I would study these over and over in the future. Cheers!

Very good material, congratulation for all involved in this great masterpiece. Thanks very very much for the knowledge, i'm very proud of you all.

As usual, very interesting and practical tasks to complete, which immediately gives an indication, how and where it can be implemented or used.

It's great,especially the mini-project and it is quite a complex problem, it is well planned so that we can reach the solution step by step.

Great class. Really enjoyed it. The guided lessons were just challenging enough for someone who has very limited programming knowledge.

At the end of the course noticed that I can write the code almost without thinking ... I was pleasantly surprised, thanks to the mentors

it was a great course to enroll. This course helped me to clear my concept about hashmap, arraylist, and taught me their various use.

I loved the you teaches us.

I loved the the step by step way to write the code.

Loved everything.

Sanuj, with lots of love from India!!

Even if Java language isn't the most "beautiful" one nowadays, it still the base if you want to understand some programs nowadays.

Applying JAVA to the problems of (ancient) cryptography. Very entertaining application examples with lots of hands-on experience.