In this post under JUnit, I will show with example how to assert whether a expected collection has same elements, at the same position when compared to actual collection. Pre JUnit 5, to do this,1) we have to iterate item by item in both collection (expected and actual) at the same time2) compare the items…… Continue reading assertIterableEquals example
Clearing ObjectPool of Idle objects
In this post under Apache pool, I will show with example how to clear idle objects from the pool. For our example lets create a pool with 5 objects and then make 3 out of them idle. I will then show how to clear those 3 idle objects. Below is the complete main code for…… Continue reading Clearing ObjectPool of Idle objects
Spring @Value annotation
In this post under Spring Core, I will show with example how to use “@Value” annotation. In previous post I showed how to access system properties, environment properties, custom properties using “Environment” interface. In all these case we had to explicitly retrieve the value as shown below and are not injected into the bean automatically…… Continue reading Spring @Value annotation
Iterating a list in both direction
In this post under Java, I will show with example how to iterate a list in both directions. For iterating in both direction, we will take the help of “ListIterator” class. We get an instance of “ListIterator” by calling “listIterator” method on a list. Below is the code snippet, where “integerList” is a list of…… Continue reading Iterating a list in both direction
Sorting a list
In this post under Java, I will show with example how to sort a list. Below is the complete main class for your reference Main class 1 package core.collection; 2 3 import java.util.ArrayList; 4 import java.util.Collections; 5 import java.util.List; 6 7 public class SortingList { 8 public static void main(String []args) { 9 List<Integer> integerList…… Continue reading Sorting a list
assertThrows vs assertThrowsExactly example
In this post under JUnit, I will show with example the purpose of “assertThrowsExactly” method and how it is different with “assertThrows” method. I have explained with example, the purpose of “assertThrows” static method in previous posts. For recap, “assertThrows” method asserts that the test method throws the expected exception. If the test method doesn’t…… Continue reading assertThrows vs assertThrowsExactly example
IllegalRegexRule example
In this post under Passay, I will explain with example the purpose of “IllegalRegexRule” class. In one of my previous post, I have explained with example the purpose of “AllowedRegexRule” class. We will have recap of it here. When validating password, we mainly check whether the password follows a particular pattern. If the password follows…… Continue reading IllegalRegexRule example
beforeAll and afterAll annotation
In this post under JUnit, I will explain with example the purpose of “beforeAll” and “afterAll” annotations. In the previous post under JUnit, I covered about “beforeEach” and “afterEach” annotation. Similarly to “beforeEach” and “afterEach”, “beforeAll” and “afterAll” is applied to methods. But methods annotated with “beforeEach” and “afterEach” annotations are executed before and after…… Continue reading beforeAll and afterAll annotation
Custom Canonical constructor in Record
In the previous post under Java Record, I mentioned how the compiler creates a long (canonical) constructor automatically. In this post, I will explain how to create a custom canonical constructor. Now why we need to provide a custom canonical constructor when it is already provided by compiler. The canonical constructor created by compiler will…… Continue reading Custom Canonical constructor in Record
Collections checkedCollection example
In this post under Java, I will explain with example the purpose of Collections “checkedCollection” method. From Java 5 onwards, we started using Generics to ensure compile time type safety. As a result of which we were unable to add element of one data type to collections of elements of another data type. At compile…… Continue reading Collections checkedCollection example
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