AWS Identity and Access Management (IAM) service controls the access for various AWS resources. We can provide or restrict access to certain users who can use particular AWS resource. AWS Components: 1) Users: IAM user is the entity by which we can access AWS services and resources.By default we get root user for using … Read more
Predicate in Java 8 The Predicate is one of the Functional Interfaces type introduced in Java 8. Generally predicate means a statement that determines if a value could be true or false. So predicate is used to test a condition which will return a boolean value. Syntax: @FunctionalInterface public interface Predicate { boolean test(T t); … Read more
Java 8 BiFunction BiFunction is a functional interface introduced in Java 8.BiFunction interface’s method takes two parameter (T and U ) and returns one parameter(R) as output. Syntax: @FunctionalInterface public interface BiFunction { R apply(T t, U u); } T: Type of the first argument to the function U: Type of the second argument to … Read more
Functional Interfaces in Java In Java, being an object oriented programming language, everything revolves around Objects and classes.If we want to write a simple one statement for displaying a message using System.out.print then also we need to write a class to have such method.Means we can’t write any function/method without writing a class in java. … Read more
Exception Handling Exception is an abnormal condition in a java program which disrupts the normal flow the program.Few examples are bad coding, wrong input data, network connectivity issue etc. Technically exception is and object that contains the exceptional details like error message and line at which issue has happened etc.When such a situation arise in … Read more
Wrapper class, Autoboxing and Unboxing Wrapper class: In java if we want to work on various data types ,we have primitives(int, char, long etc) types available but if you want to work only with objects then wrapper classes can be helpful. Wrapper class is a class in java which is a wrapper around primitive data … Read more
Supervised vs Unsupervised Learning Explained Supervised learning: Supervised learning uses labelled datasets.Based on this labelled data, system will predict the possible outcome. We train the system by providing labelled data so that when system encounter real & unseen data, it applies the learning from labelled data basis the same, it will predict the possible outcome. … Read more
Set in Java Set interface is an unordered collection of elements but you can’t store duplicate values in Set.It does not maintain the insertion order.To use the set, we can use 4 classes. 1)HashSet 2)LinkedHashSet 3)EnumSet 4)TreeSet We can create the implementation object for any of above classes: HashSet: If we don’t care about the … Read more
Java Arrays An array is a data structure which will store only homogeneous elements.That means all the elements stored in an array would be of same data type. For example if we create an array of string then all the elements which can be stored would be of type String only.Other data types like int,long … Read more
ArrayList in Java ArrayList provides the dynamic array for storing the elements. ArrayList is a class in Java collection framework.It comes under java.util package. Need for ArrayList: We use ArrayList when we need to do lot of modifications to the elements. Feature of ArrayList: 1)ArrayList is similar to Array but there is no limit on … Read more