In this tutorial, we are going to deploy React JS(Front End) and Node JS(Back End) as a single application in Heroku Server. Without deploying in individual servers, we will deploy both React JS & Node JS in a single server., so that API calls can be connected only from our front end to Back end. …
Snake game is famous classic game, starting from handset mobile to latest mobile, it always has its own admirers. The goal of the game is the snake needs to catch its food and grow to a maximum. In this example we will see how we can implement the logic in Java. Logic: The game follows …
What is React JS ? React is a Javascript library for creating User Interfaces. Simple For Interactive UI designs. Efficiently update the screens & render UI components with dynamic data from server. What is Single Page Application? In a Web Page, dynamic data will be loaded from server to page, without reloading the entire page., …
There are several open source libraries in Java helps to convert images to Java. Images can be of any valid types like jpg, jpeg, png, webp, tiff, bmp etc., ITextPdf library is one of the Java library which has more features require to do all type of operations in PDF. To Include ItextPdf library in …
Fibonocci series Fibonocci Series is one of the basic questions in Java., to check the programmer has a basic understanding of logic implementation in java. In Fibonocci series, the current number is always the sum of previous two numbers. Fibonocci series is initialized with 0 & 1. 0, 1, (0+1)2, (1+2)3, (2+3)5, (3+5)8, (5+8)13….
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public class Fibonocci { public static void main(String args[]) { int previousNumber = 0; int recentNumber = 1; int nextNumber; int count = 20; System.out.print(previousNumber + " " + recentNumber); for (int i = 2; i < count; ++i) nextNumber = previousNumber + recentNumber; System.out.print(" " + nextNumber); previousNumber = recentNumber; recentNumber = nextNumber; } } } |
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Java 8 has introduced java.util.Optional class to find a value present or absent. Normally Java developers do “not null” check to identify whether the Object is null or to be used further for business logic. In a Enterprise application, lot of null checks present as each meaning object is checked, which makes the code messy. …
What is Binary? Binary is a number either 0 or 1, is a base 2-numeral. Every value of Integer can be represented in binary format in a easy way. Simply, to convert Integer value to binary value, divide the integer by 2 until it becomes 0., and store the reminder… 0 – 0000 1 – …
Props – Props are properties/arguments passed to the React JS Component/Function., Props values are rendered only when the page initially rendered output HTML/output. Change in Props will not be rendered dynamically in a web page. State – State are variables holding the state of the webpage.,Any change in state variables are rendered to the HTML/Output …
Apache Log4j2 is used for printing info, error, debug, trace logging statements in enterprise applications. Inorder to format all the log messages externally before printing in logs, we need to create Filters in Log4j 1.x versions. In Log4j2 , we can use LogEventPatternConverter to filter/convert/format log messages before printing in the log files in server. …
Configure Log4j2 Converter Plugin -Java (Filter log messages) Read More »
Apache Log4j2 is used for printing info, error, debug, trace logging statements in enterprise applications. Apache Log4j2.x is an extension of Log4j1.x which has more significant features comparatively.Since major security vulnerabilities like Log4jShell & hacking possibilities are identified in Log4j1.x, it is always recommended to use Log4j2.x. It is pretty simple to configure Log4j2 in …
Date conversions are very common scenarios in any application., Java Provides SimpleDateFormat class for String to Date, Date to String conversions. The below example shows How String format can be converted to Date Format. How to find difference between 2 Dates. Code:
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import java.text.SimpleDateFormat; import java.util.Date; class Example { public static void main(String args[]) { String date = "11/13/2018"; try { SimpleDateFormat sdf = new SimpleDateFormat("MM/dd/yyyy"); Date parseDate = sdf.parse(date); System.out.println(parseDate); long differenceInMillis = new Date().getTime() - parseDate.getTime(); long differenceInDays = ((differenceInMillis/1000)/(60*60*24)); long year = differenceInDays/365; System.out.println("DifferenceInDays:"+differenceInDays); System.out.println("Age:"+year); } catch(Throwable t) { t.printStackTrace(); } } } |
Output
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Tue Nov 13 00:00:00 UTC 2018 DifferenceInDays:1099 Age:3 |