Modularizing our code has many advantages: Code Re-use, breaks complex problems into smaller more manageable problems, provides for abstraction. When we build are modules correctly they can be re-used across many different applications/systems. Also, programmers can use Methods in their applications without having to know the details of how each Method was programmed, this is abstraction. We have used Java standard built-in modules without having to know the details of how it was programmed already (abstraction), one example being the System. out. println() method. We don't know the code that does this work for us, we just know the Method name to use to call it and that is requires one parameter - a String datatype, and that that String is displayed on standard out which is usually the terminal output.