DefinitionSyntaxExampleOutputFeature TimelineWhat is Switch Expression in Java ? Switch Expression is a new feature introduced in Java 12, which allows developers to use switch statements… Read More

IntroductionSyntaxExamplesMethodsReferencesIt’s now possible to create multi-line String literal without the need to concatenate strings on line breaks. This makes text blocks a useful… Read More

DefinitionEnablingExampleDisablingConclusionWhat is AutoConfiguration in Spring Boot ? Autoconfiguration in Spring Boot is a powerful feature that allows developers to easily and quickly… Read More

IntroductionObjectiveExamplesOverridingSummaryWhat is Default Configuration in a Spring Boot Application ? Default configuration in Spring Boot refers to the set of configurations that Sp… Read More

To convert an Array to a Stream in a Java program, you can follow these steps: Here’s an example program that converts an array of integers to a stream and prints the stream elements:… Read More

What is Record in Java ? Record in Java is a new kind of type declaration which has a concise syntax for defining immutable data-only classes. Purpose: Record was introduced in Java… Read More

What is Actuator in Spring Boot ? Spring Boot Actuator is a set of tools and endpoints that allow developers to monitor and manage their Spring Boot applications. It provides a variety… Read More

This article explains the concept of reactive programming and shows how to implement it in Java using Reactor Framework with example. Reactive programming is a programming paradigm that i… Read More

This example demonstrates the use of functional programming in Java, using the functional features introduced in Java 8, such as streams and lambda expressions, to write clean and concise co… Read More

This tutorial explains what is a Functional Interface in Java and how to implement it using lambda expression. This example demonstrates how functional interfaces can be used to pass beha… Read More

This Java tutorial explains how to set Logging level in the spring boot application. Starting with Spring Boot v1.2.0.RELEASE, the settings in application.properties or application.yml do… Read More

This Java article explains what is the use of mvnw and mvnw.cmd files in the Spring Boot application. These files present in the root directory of Spring Boot application are from Maven W… Read More

This Java tutorial demonstrates how to run code after spring boot application startup. There are several ways using which we can execute code or logic right after starting of a spring boo… Read More

LinkedList in Java In Java, LinkedList is a class that represents a sequence of elements. Each element in the LinkedList is represented by a node object, which has a reference to the next… Read More

This example shows how to make a POST API Call using Retrofit in Android. Below code uses Java  retrofit2 library to execute an HTTP POST REST web service request with Retrofit HTTP cli… Read More

build.gradle [Module]dependencies { .. implementation 'com.squareup.retrofit2:retrofit:2.7.1' implementation 'com.squareup.retrofit2:converter-gson:2.7.1' ... }RetroClie… Read More

This Java article explains how to show SQL statements or queries generated by JPA or Hibernate in the Spring Boot Application logs. For logging SQL statements generated by Spring Data JPA… Read More

This example shows how to create and insert object data in Realm Database on Android. Below Java code uses Realm Java SDK / Library on Android. // Define your model class by extending RealmO… Read More

Realm Create / Insert Object Query – Android Realm Database Java Example// Define your model class by extending RealmObject public class User extends RealmObject { private String na… Read More

This Java example code shows how to run or execute a write transaction in Realm database on Android using executeTransaction() or executeTransactionAsync() methods. If the code in the callba… Read More

— Unlike read operations, write operations in Realm must be wrapped in transactions. — At the end of a write operation, you can either commit the transaction or cancel it. Real… Read More

— A Realm is an instance of a Realm Mobile Database container. — Default Realm configuration uses the Realm file “default.realm” located in Context.getFilesDir(). &m&helli…Read More

Before you can use Realm in your application, you must initialize it. This only has to be done once using method Realm.init(context); You must provide an Android context. A good place to in… Read More

— You can add a JSON object that maps to a RealmObject to Realm. — The JSON object can be a String, a JSONObject or an InputStream. — Realm will ignore any properties in t… Read More

Sorting Objects in RealmResults – Android Realm Database Java Exampletry (Realm realm = Realm.getDefaultInstance()) { // Obtain the results of a query RealmResults results… Read More

This example shows how to delete single object or all objects data in Realm Database on Android. Below Java code uses Realm Java SDK / Library on Android. — Delete Realm Object… Read More

Delete Realm Object Query – Android Realm Database Java Exampletry (Realm realm = Realm.getDefaultInstance()) { // Obtain the results of a query RealmResults results = real… Read More

try (Realm realm = Realm.getDefaultInstance()) { RealmResults results = realm.where(Model.class).findAll(); List list = new ArrayList(); list.addAll(realm.copyFromRealm(result… Read More

Convert RealmResults to Java ArrayList – Android Realm Database Exampletry (Realm realm = Realm.getDefaultInstance()) { RealmResults results = realm.where(Model.class).findAll();… Read More

Convert Java 8 LocalDateTime to Util Date Object ExampleLocalDateTime localDateTime = LocalDateTime.now(); Date date = Date.from(localDateTime.atZone(ZoneId.systemDefault()).toInstant());… Read More

Enable Go Back to Previous Page on Back Button Click in Android WebViewpublic class MainActivity extends Activity { private WebView webView; @Override protected void onCreate(Bundl… Read More

By Default JavaScript is disabled in a WebView. You can enable it through the WebSettings attached to your WebView. You can retrieve WebSettings with getSettings(), then enable JavaScript wi… Read More

Android WebView is an extension of View class that allows you to display web pages as a part of your activity layout. If you want to build a web application or just a web page as a part of a… Read More

Check if File Exists in Android Internal Storagepublic boolean fileExists(Context context, String filename) { File file = context.getFileStreamPath(filename); if (file != null &&… Read More

Simple Interest = (P × R × T) / 100 P — Principal amount R — rate per annum T — time in years Java method to calculate simple interest with given p, r and t v… Read More

// In Java another constructor of the same class can be called // from a constructor using 'this()'. // Note: 'this()' has to be on the first line. public class Foo { private int x;… Read More

String[] stringArray = new String[] {"AB","BC","CD","AE"}; Arrays.asList(stringArray).contains("XY"); // --> false Arrays.asList(stringArray).contains("AB"); // --> true // Note: Th… Read More

new String("test").equals("test") // --> true new String("test") == "test" // --> false new String("test") == new String("test") // --> false "test" == "test" // -->… Read More

import java.awt.Color; import javax.swing.JWindow; import javax.swing.JPanel; public class SetJWindowBackgroundColor { public static void main(String[] args) { //Color is base… Read More

import java.util.Deque; import java.util.Iterator; import java.util.LinkedList; public class DequeExample { public static void main(String[] args) { Deque deque = new LinkedLis… Read More

<HTML> <HEAD> <TITLE>Using Abstract Classes</TITLE> </HEAD> <BODY> <H1>Using Abstract Classes</H1> <%… Read More

import java.util.Arrays; /** * Algorithm * * 1] Compare each pair of adjacent elements from beginning * of an array and, if they are in reversed order, swap them. * * 2] If at least o… Read More

import javax.media.*; import java.io.File; import java.awt.*; public class TrivialJMFPlayer extends Frame { public static void main (String[] args) { try { Frame f = new TrivialJMFPl… Read More

HashMap is a non-synchronized collection class. If we need to perform thread-safe operations on it then we must need to synchronize it explicitly. Iterator should be used in a synchronized b… Read More

Take a look @ Joda-Time FAQ You can use a PeriodFormatter to get the format of your choice. Try the following sample code. DateTime dt = new DateTime(); DateTime twoHoursLater = dt.plusHo… Read More

This example show how to format date in JSP using format tag library. <%@ taglib uri="http://java.sun.com/jsp/jstl/fmt" prefix="fmt" %> <html> <head> </head> <bod… Read More

class GenericConstructor { private double value; <T extends Number> GenericConstructor(T arg) { value = arg.doubleValue(); } void showValue() { System… Read More

Since JDK 1.6, Java developers are able to access network card detail via NetworkInterface class. In this example, we show you how to get the localhost MAC address in Java. import java.net.I… Read More

public enum UserStatus { PENDING("P"), ACTIVE("A"), INACTIVE("I"), DELETED("D"); private String statusCode; private UserStatus(String s) { statusCode = s; } pu… Read More

Make sure date isn’t null, though, otherwise it acts like new new DateTime() Read More

Download OpenCSV: http://sourceforge.net/projects/opencsv/files/latest/download OpenCSV is a free and open source library for reading and writing CSV files in Java. We need to have latest op… Read More

MinMax.java MyClass.java GenIFDemo.java Read More

Download Log4j: http://logging.apache.org/log4j/index.html Log4j Appender: Create a Log4j properties file (log4j.properties) and define the appender details (where to log and log file detail… Read More