How much Java should you know for Big Data Hadoop Training

Apache Hadoop is an open-source software framework for distributed storage and distributed processing of very large data sets on computer clusters built from commodity hardware.

Hadoop can basically be divided into two major components

1.      HDFS(Hadoop Distributed File System)

2.      MapReduce

Basic Factors about Hadoop

-          Hadoop only runs on Linux powered Operating Systems such as Ubuntu, RedHat.

-          Hadoop is written and developed using Java.

As Hadoop is written in Java doesn't mean that working with Hadoop requires you to be a master in Java.

But basic building blocks of Java are required to be clear before you start working on Hadoop.

So here is the list of the topics you should be familiar if you need to start working in Hadoop.

Objects and Classes

A class is nothing but a blueprint or a template for creating different objects which defines its properties and behaviors. Java class objects exhibit the properties and behaviors defined by its class. A class can contain fields and methods to describe the behavior of an object.

Arrays

Java provides a data structure, the array, which stores a fixed-size sequential collection of elements of the same type. An array is used to store a collection of data, but it is often more useful to think of an array as a collection of variables of the same type.

Control Flow Statements

- In Java, the statements inside any source file are executed in an ascending order, i.e from top to bottom. Control flow statements are commands that allow breaks in the execution pattern. You can actually customize and execute particular blocks of code in your source file - using control flow statements.

Inheritance

Inheritance in java is a mechanism in which one object acquires all the properties and behaviors of parent object.

The idea behind inheritance in java is that you can create new classes that are built upon existing classes. When you inherit from an existing class, you can reuse methods and fields of parent class, and you can add new methods and fields also.

Inheritance represents the IS-A relationship, also known as parent-child relationship.

Interfaces

It is similar to class. It is a collection of abstract methods. A class implements an interface, thereby inheriting the abstract methods of the interface. Along with abstract methods, an interface may also contain constants, default methods, static methods, and nested types.

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