Java Interview Preparation (Coding Basis)

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Java Interview Preparation (conceptual)

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 All Concepts sumerized .... ------------------------------------------------------------- *** Java is partially Object-oriented as it has primitive types. (Primitive i.e. int, float are not the objects, to convert them to use as Object, we use wrapper class) ***Java is platform-independent but JVM dependent. And JVM is platform dependent because for Linux there is a different JVM whereas for windows it's different. _-_____-----___--___--____--- Oo ps Conc ept  _-_____-----___--___--____--- abstraction ,  encapsulation ,  inheritance ,  polymorphism .  Inheritance : Real-World Example : Children have some of the qualities of their parents and grandparents or their ancestors. Java Example: There is a method in the parent class and you want the same method to create in a child class. Why create a new one if it already exists. As a child, you can inherit the method. There are a few variables in a class and you need them .So why to create new variables. We can ...
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Git Commands With Output Log

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Step by step command only Guide where command starts with symbol $ ----------------------------- git config -- global user . name "your username"   git config -- global user . password "your password" Track file : This means the file is added to the git repository in your local machine. Also called added to the stage area. Untracked File : Code is still in your local folder not added to git repository ----------------------------------------------- Commands --------------------------- checking current working directory  rssan@DESKTOP-QA9A7TD MINGW64 ~ $ pwd /c/Users/rssan creating a new directory rssan@DESKTOP-QA9A7TD MINGW64 ~ $ mkdir test getting inside that newly created directory rssan@DESKTOP-QA9A7TD MINGW64 ~ $ cd test creating a new directory inside for git repository rssan@DESKTOP-QA9A7TD MINGW64 ~/test $ mkdir repo getting inside the newly created repo directory rssan@DESKTOP-QA9A7TD MINGW64 ~/test $ cd repo/ Again created a mygitrepo directory inside rss...
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Java 8 Function Interface

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Java.Util.Function ------------------------ Java.Util.Function added in java 8. So let's have a closer look into it. To go through the documentation click the below link. https://docs.oracle.com/javase/8/docs/api/java/util/function/package-summary.html The 4 important topics are , 1. Predicate 2. Consumer   3. Function 4. Supplier A youtube example for better understanding is :  https://www.youtube.com/watch?v=Tapz6_T5oHY Consumer :  --  two methods, accept(T t) and andThen() ** accept(T t) , returns void means no thing returned. It accepts only input. **andThen executes two consumers one after another. #java #java8 #java 8 #java.util.function #javaFunction #java function #java consumer #java predicate #java supplier #java lambda expression
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