Karnataka's bridge

Java Objects & Classes

Java Objects & Classes : J ava is an Object-Oriented Language. As a language that has the Object-Oriented feature, Java supports the following fundamental concepts − Polymorphism Inheritance Encapsulation Abstraction Classes Objects Instance Method Message Passing Objects in JAVA : Everything in Java is associated with classes and objects, along with its attributes and methods . For example : in real life, a car is an object. The car has attributes, such as weight and color, and methods , such as drive and brake. A Class is like an object constructor, or a “blueprint” for creating objects. Classes in Java A class is a blueprint from which individual objects are created. public class Dog { String breed; int age; String color; void barking() { …. } void hungry() { …. } void sleeping() { …. } } Constructors One of the most important sub topic would be constructors. Every class has a constructor. If we do not explicitly write a constructor for a class, the Java compiler build

“Gapminder” Exploratory Data Analysis using R for Data Science

M ain focus is to investigate the dataset Gapminder and interact with it. To illustrate the basic use of EDA in the dplyr,ggplot2 package, I use a “gapminder” datasets. This data is a data.frame created for the purpose of predicting sales volume. Using the dplyr package to perform data transformation and manipulation operations. Using the ggplot2 package to visually analyze our data. Load Packages #install.packages("gapminder") library(gapminder) library(dplyr) library(ggplot2) The variables are explained as follows: Country — factor with 142 levels Continent — Factor with 5 levels Year — ranges from 1952 to 2007 in increments of 5 years lifeExp — life expectancy at birth, in years pop — population dgoPercap — GDP per capita head(gapminder_unfiltered,5) #Unfiltered data tail(gapminder_unfiltered,5) Display name of Variables : names(gapminder_unfiltered) Data Cleaning : Finding the missing values as we can see this data has no missing values str(gapminder_unfiltered) summary

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