How to fill an object with random number of the same characters? [duplicate]

This question already has an answer here:

• How do I generate random integers within a specific range in Java? 54 answers
• Java - Create a new String instance with specified length and filled with specific character. Best solution? 16 answers

I'm just starting with java and I've been stuck with one issue for my bootcamp's tasks.

I need to generate ArrayDeque of 50 objects which are filled with random number (from a 0-50 range) of 'a' char, i.e. object1 = "aaa", object2 = "aaaaaaaaaaa", etc.

I could not find any answer to this specific problem so I ask for your help guys. Please note that I won't use any "high-level" answers due to my lack of knowledge and experience. Please keep it simple :)

Thanks.