You cannot judge yourself by the number of programs you solved. You can judge based on your confidence to solve any program.

It requires two important understandings.

1) Technical understanding - knowing the syntax & working of java statements like operators, if condition, looping statements, arrays, etc. Specially why we need each of these in Java?

2) Analytical skill - Ability to understand & analyze the program definition and able to solve the same using java. This has to be developed by solving different exercises in java so you'll get the idea in which case we need to use which java concepts and how we need to start. It's pure art and you need the practice to learn that art.

This course has a standard set of exercises where anyone can learn how to solve the program from scratch & it covers most of the important programming concepts which I mentioned above. Basically, it'll help you to develop analytical skills by solving different exercises starting from basics to advance. After solving this program you'll get confidence in writing any program by yourself.

The last thing, you need to write down these programs by yourself then and then you'll get confidence otherwise by just watching the videos you'll never get enough confidence in programming because as I mention it's an art and you can learn art only by performing it your self.