How to check if Key or Value exists in a Map ?

How to check if Key or Value exists in a Map ?
DeeKay February 11, 2018 at 2:04 am · java.util

In this tutorial we will see how to check if Key or Value exists in a Map. Map or HashMap is the java collection class which stores data in Key-Value pair. Java collections is a set of classes and interfaces that implement commonly reusable collection data structures. To check if Key or Value exists in a Map, Map or…
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How to get user home directory in java for all OS?

How to get user home directory in java for all OS?
DeeKay September 23, 2017 at 10:05 pm · JAVA API

How to get user home directory in java is the common question arises while creating Java/Swing GUI applications. You can get home directory of user using System.getProperty(“user.home”) function. Below java code shows you how to get User home directory. This code will work on Java 1.8 for all OS. Output: There is a bug#JDK-6519127 which…
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Vue.js Conditional Directives Example

Vue.js Conditional Directives Example
DeeKay September 21, 2017 at 3:54 am · Vue.js

In this tutorial we will see how to use Vue.js Conditional Directives. You can also checkout other Vue.js tutorial as listed below Other Vue.js tutorial Vue.js Hello World Example Vue.js v-bind Directive Example Most of the dynamic web application expect an ability to show or hide elements based on conditions in any front-end framework. Vue.js…
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How to convert java.util.Date from java.time.LocalDate?

How to convert java.util.Date from java.time.LocalDate?
DeeKay August 12, 2017 at 3:13 am · JAVA API

The following Java code snippet shows how to convert java.util.Date from java.time.LocalDate  and vice versa. In the first part of the code snippet we convert java.util.Date from java.time.LocalDate and back to LocalDate object. In the second part we convert java.time.LocalDate from java.util.Date and back to java.util.Date object.


Web Application with Spring Boot and Thymeleaf Example

Web Application with Spring Boot and Thymeleaf Example
DeeKay July 28, 2017 at 2:19 am · Spring, Spring Boot

In this article, I will show you a web application with Spring Boot and Thymeleaf example but first of all, let’s see what is Spring Boot and how it helps in the development of Spring Framework based web application development. Table of Content Introduction Prerequisite Download Source Code Create Spring Boot and Thymeleaf Example Web…
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How to get Free, Used and Total Memory in Java ?

How to get Free, Used and Total Memory in Java ?
DeeKay June 20, 2017 at 2:02 am · How To, JAVA API

As you know that Java does the automatic garbage collection which you need not worry about. However sometime you want to know how large the java heap space is and how much of it is left. Information about Free, Used and Total memory in java can be used for checking your code efficiency. To obtain…
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Vue.Js v-bind Directive Example

Vue.Js v-bind Directive Example
DeeKay January 23, 2017 at 2:23 am · Vue.js

In the previous example, we created Vue.js Hello World example using the text interpolation method in Vue.js. Here we will see Vue.js v-bind directive example to bind the HTML element to data. Directives in Vue.js are extended HTML attributes with the prefix v-. There are many directives provided by Vue.js and one of them is v-bind…
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Vue.js Hello World Example

Vue.js Hello World Example
DeeKay January 21, 2017 at 4:44 am · Vue.js

Vue Js Hello World Example is the best way to kick start the learning of Vuejs. Vue.js is the pure frontend development javascript library. It is becoming popular as a JS library for reactive components. It is lightweight, simple and focused on the view layer only. Other Vue.js tutorial Vue.js v-bind Directive Example Vue.js Conditional Directives…
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How to convert String to Int in Java ?

How to convert String to Int in Java ?
DeeKay January 20, 2017 at 3:25 am · JAVA API

To convert String to Int in Java, you can use the below methods of Integer class. Methods to convert String to Int 1) Integer.parseInt() code example /** * Created on Nov 19, 2016 Copyright(c) https://kodehelp.com All Rights Reserved. */ package com.kodehelp.java.lang; /** * @author https://kodehelp.com */ public class ConvertStringToInt { public static void main(String args[]){…
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Log4j2 configuration file examples

Log4j2 configuration file examples
DeeKay January 6, 2017 at 4:14 am · How To

Log4J2 Properties configuration through a configuration file can be achieved in below 4 different file formats. Properties file format – log4j2.properties YAML file format – log4j2.yaml or log4j2.yml JSON file format – log4j2.json XML file format – log4j2.xml I don’t see many examples available for log4j 2 configuration. Here are the few examples of Log4j 2…
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How to delete folder recursively on remote server using SFTP in java?

How to delete folder recursively on remote server using SFTP in java?
DeeKay January 5, 2017 at 3:46 am · How To, SFTP

Deleting or removing a folder recursively on the remote server in java is easy using JSCH (SFTP) API. Nowadays it is a common use case in software projects where you need to delete or remove a folder from the remote server using SFTP connection. Below java code shows you how you can delete or remove…
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How to delete file on remote server using SFTP in java?

How to delete file on remote server using SFTP in java?
DeeKay January 5, 2017 at 2:41 am · How To, SFTP

Deleting or removing a file on remote server in java is easy using JSCH (SFTP) api. Now-a-days it is a common use case in software projects where you need to delete a file from the remote server using SFTP connection. JSch is a pure Java implementation of SSH2 (We can use SFTP Channel). JSch allows…
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How to generate pseudorandom numbers in Java ?

How to generate pseudorandom numbers in Java ?
DeeKay January 3, 2017 at 8:45 pm · How To, java.math, java.util, Other

In this post we will see how to generate pseudorandom numbers in Java. Before that we will see what is Random numbers. Random numbers are the numbers that occur in sequence such that the values are uniformly distributed over a defined interval or set, which is impossible to predict future values based on present and…
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Java Program For Uploading Folder Content recursively from local to SFTP Server

Java Program For Uploading Folder Content recursively from local to SFTP Server
DeeKay December 29, 2016 at 3:55 am · How To, SFTP

Java program for uploading the content of a local machine directory or folder to SFTP server is not straight forward. If we use JSCH API for SFTP upload then you cannot use channelSftp.put(new FileInputStream(sourceFile), sourceFile.getName(), ChannelSftp.OVERWRITE); method. This channelSftp.put() method will work for single file upload but you cannot use it for folder upload. Below Java…
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Working with Log4J Basics – A Log4J Tutorial

Working with Log4J Basics – A Log4J Tutorial
DeeKay December 28, 2016 at 9:08 pm · APIs, Tutorial

Introduction Here is your Basic Log4J tutorial helps you to setup Log4J in your application. Log statements placed in your code will work as a high level debugging mechanism for your application. Here I’m saying the logging mechanism as high level debugging mechanism, as low level debug mechanism is debugging the code step-by-step using IDE…
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Java Program For Downloading Folder Content recursively from SFTP Server

Java Program For Downloading Folder Content recursively from SFTP Server
DeeKay December 28, 2016 at 4:56 am · How To, SFTP

How to download folder from SFTP Server (Secure File Transfer Protocol) is the common use case for Java developer who wants to download folder from SFTP. To write a java program to download from SFTP, you will need to download JSCH jar file. For other SFTP operations in java, please refer below posts on Kodehelp.com –…
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Java 8 – How to find Date on the day of given Week in a month ?

Java 8 – How to find Date on the day of given Week in a month ?
DeeKay December 6, 2016 at 9:17 pm · java.time

In this Java 8 program we will see how to find date on the day of given week in a month. For example if we want to find the date on 3rd Wednesday of current month.  


What is the difference between HashTable and HashMap in Java?

What is the difference between HashTable and HashMap in Java?
DeeKay December 2, 2016 at 3:12 am · java.util

Both HashTable and HashMap are java collections and implements java.util.Map interface. Difference between HashTable and HashMap is the most common interview question. Many of the candidates who face the interview struggle to answer this question. Difference between HashTable and HashMap in Java Thread Safe: HashTable is thread-safe and can be shared between multiple threads but…
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How to Sort a Map by key in Java?

How to Sort a Map by key in Java?
DeeKay November 20, 2016 at 2:00 am · java.util, sorting

Here we will see how to sort a Map by key in java. There are two ways to sort a Map by Key –   First Approach Second Approach


How to make SFTP or SSH connection using public key authentication in java?

How to make SFTP or SSH connection using public key authentication in java?
DeeKay May 11, 2015 at 7:32 pm · How To, SFTP

Using SFTP or SSH public key authentication to make the connection to remote system is more secure and robust method than login with account password. SSH public key authentication is an authentication method that relies on asymmetric cryptographic algorithms that generate a pair of  separate keys, one private and the other public. Private Key is the secret key…
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