Java

How to Create a Simple Mockito Unit Test

Mockito is a popular Java framework which comes to great help in Unit testing. In Unit testing it’s important to get to a state where you can concentrate on testing a specific functionality or behaviour. Mockito can help you with this by mocking or simulating specific methods which you may need. It’s important to be… read more »

Connect to Elasticsearch with Java and RestHighLevelClient

Connecting to Elasticsearch and executing queries is generally considered easy. In fact, in many cases a simple curl query like this one is all you need: Though, if you want something more than just finding all documents that contain mySearch (as per the example above), you may get lost in the abundance of options and… read more »

Build A Java Project With Maven

Using Maven to maintain and build your Java projects has a lot of advantages including automatically resolving dependencies, running tests and packaging. In this article you will learn about a complete development cycle using Maven from creating the project to building it. Installing Maven You can install Maven on most Linux distributions using the default… read more »

Terminate Java Thread

The best way to terminate a Java thread is with a switch such as a boolean property, .e.g abort. As soon as a condition is met, usually a timeout, you can change the value of abort to true and thus exit thread. Example: import java.util.concurrent.*; public class CheckResults { private static int counter = 0;… read more »

Referencing a Child Object to a Variable of Type Parent in Java

Referencing a child object to a variable of type parent in Java can be real confusing. Here is an example of two classes Person and Student and an overriden method whatAmI: class Person { String it = “It is a Person.”; public void whatAmI(Object x) { System.out.print(“Person’s object… ” + it); } } class Student… read more »

Working with Time and Date in Java

Working with time and date in Java is essential to any project. There are three important classes you can use: java.time.LocalTime – working only with time. java.time.LocalDate – working only with date. java.time.LocalDateTime – working with time and date both. All three classes provide two essential methods: of(arguments) – accepting arguments for the time/date/datetime values…. read more »

How to Parse Time in Java

To parse time in Java, the most trouble-free and programatic way is using the parse method of the LocalTime class like this: import java.time.LocalTime; import java.time.format.DateTimeFormatter; public class TimeParse { public static void main(String[] args) { String inputStr = “Time is 11 minutes past 11PM.”; String pattern = “‘Time is ‘m’ minutes past ‘ha.”; DateTimeFormatter… read more »

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