How to retrieve System properties in Java

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This post contains the procedure to retrieve system data without using any external libraries. I use java.lang.System to retrieve data and java.util.Properties class to store them so that we can Iterate and retrieve system data in our code.
As you may know System class is a final class and cannot be instantiated , hence it provides us three static methods to retrieve system properties. Before using the second and third methods we need to know what these keys are.     More...