r/javahelp • u/Full_School_7230 • 6d ago

How do developers study Java src code ?

Hey everyone,

I’m currently learning Java to build projects and grind Data Structures & Algorithms (DSA), but I am hitting a massive wall with how the code is structured.

Today, I was trying to implement a simple ServerSocket. To understand what was happening, I instinctively Ctrl+Clicked on it. The IDE immediately unzipped the internal source code and dragged me down a never-ending rabbit hole: from ServerSocket, to SocketImpl, all the way into NioSocketImpl and hidden factory classes.

It throws hundreds of lines of complex internal implementation code at me. It is incredibly time-consuming, frustrating, and completely breaks my momentum. I feel like I'm getting sucked into a black hole of code that I didn't even write, and if I keep this up, I am going to get stuck and fail to actually build anything.

I need a serious reality check and some practical advice:

  1. How do developers actually read and reason about Java without constantly opening up the internal source files?

  2. What is the fastest, cleanest way to look up how to use a class/method without getting bogged down by its underlying implementation code?

  3. How do I force myself to treat things like ServerSocket as "black boxes" so I can just focus on building my app and solving DSA patterns?

Any strategies to help me break this habit and speed up my learning would be deeply appreciated. Thank you!

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u/khooke Extreme Brewer 6d ago

You need to accept that it’s s ok to use an api or a library without needing to know how it works. Read the docs to understand what you need to use/invoke it … and that’s it.

Think about everything around you that you use on a daily basis without needing to know how it works - e.g. you don’t need to know how an internal combustion engine works to drive a car.

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u/Full_School_7230 6d ago

And how to search for docs sorry to ask I am a completely dumb newbie.

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u/BanaTibor 6d ago

In intellij you can tell the ide to also download the javadoc. There is a keyboard shortcut for quick doc. Also what others said, read the documentation. It is baffling how people just do not think about reading the doc anymore.