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JAVA 8 FUNTIONAL INTERFACE

JAVA 8 FUNTIONAL INTERFACE  Funtional Interface :     An interface which has only one abstract method can be called a funtional interface. Comparable , Runnable , Callable all these interfaces has only one abstract method and can be consider as funtional interface.    How it works :        Once we will create a interface with one abstract method then java internally predicates the input type and based on the Interface reference it apply the logic mentioned after lambda expression    lets consider we have created an interface as below @FunctionalInterface public interface FuntionalExample { public int cal ( int a , int b) ; } And below class to test our funtional Interface. public class FuntionalInterfaceExample { public static void main (String args[]) { FuntionalExample addition=( int a , int b) -> a+b ; FuntionalExample subtraction=( int a , int b) -> a-b ; FuntionalExample multipl...
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JAVA MEMORY LEAK, UTILISATION AND MONITORING USING JFR using Mission Control

JAVA MEMORY LEAK, UTILISATION AND MONITORING USING JFR using Mission Control Java flight recording(JFR) help us to analyse and find the root cause of any slowness in our program along with CPU usage , hot methods and garbage collection , profiling etc. To visualise we need to feed .jfr file to JDK mission control present in JDK bin folder. After successful compilation , we should run the program with below option which will generate the .jfr and feed to mission control.   command :  j ava -XX:+UnlockCommercialFeatures -XX:+FlightRecorder  -XX:StartFlightRecording=duration=200s,filename=flight.jfr -cp ./out/ path-and-class-name Below are some example to understand how this JFR can be helpful. 1. Lets consider we have created a java program in which we have used LinkList to store the elements and in same program we are using contains method inside a for loop of 1 million , in this case each time this contains method will be called then 1 million records will be sc...
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Object-Oriented Programming Concept in Java

OOPS( Object-Oriented Programming ) Concept in Java :   As we all know Java is Object Oriented programming language and what exactly it means in simple words to understand can be described as whatever is going to happen by Java , it will be based on some Object.  So next question can be what is Object ? , "Object is the representation or reference of Class to access its properties and use its behaviour ", now next is What is Class in java and answer to this question is "A class in java is the blueprint of Properties and Behaviours of it's own Object" as explained in my previous post  BASIC OVERVIEW OF JAVA  (SESSION 1)   Let's understand through an example : public class FirstJavaProgram { int firstNumber=10; int secondNumber=20;      public int sum(int fNum, int sNum){         return fNum+sNum;     }     public static void main(String[] args) {     //our logics ...
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