In this post under Java Collections, I will show with example an api provided in “Arrays” class that will populate any array with a particular element. We are talking about “Arrays” class static method “fill”. It takes two arguments1) the array to be populated2) the element to be fill int array For our example I…… Continue reading Populating the entire array with same element
SpelExpressionParser example
In all my previous post under Spring SpEL, I was letting Spring framework to evaluate the SpEL expression when creating the Spring application context. In addition to that we can manually evaluate a SpEL expression using SpelExpressionParser class. This class is provided by Spring framework and below example shows how to use it. Main class…… Continue reading SpelExpressionParser example
Arrays toString method
In this post under Java Collections, I will show with example how to convert an array into its string representation. In Java, any object when converted to its string representation, it calls the object’s “toString” method. The default behavior of “toString” method is to print the below information getClass().getName() + ‘@’ + Integer.toHexString(hashCode()) In case…… Continue reading Arrays toString method
Sorting Array
In this post under Java, I will show with example how to sort an array. Below is the complete main method for reference. Main class package core.collection; import java.util.Arrays; public class ArraysSortDemo { public static void main(String[] args) { int[] integerList = new int[] {5, 2, 3, 1, 4}; Arrays.sort(integerList); for(int value : integerList) {…… Continue reading Sorting Array
Ternary operator in SpEL
In this post under Spring SpEL, I will show with example how to use ternary operator in SpEL. Below is the main class for your reference. Main class 1 package spel.package18; 2 3 import org.springframework.beans.factory.annotation.Value; 4 import org.springframework.context.ApplicationContext; 5 import org.springframework.context.annotation.AnnotationConfigApplicationContext; 6 import org.springframework.context.annotation.Bean; 7 import org.springframework.context.annotation.Configuration; 8 9 import java.util.Arrays; 10 import java.util.List; 11…… Continue reading Ternary operator in SpEL
Mapping using direct field access
In all my previous post under MapStruct, in the examples I showed MapStruct used to call public getter and setter methods to map data from one object to another. It is not compulsory that we should always have public getter and setter methods. MapStruct can directly access the fields if they are marked “public” or…… Continue reading Mapping using direct field access
Expression Templating Example
In this post under Spring SpEL, I will explain with example what is “Expression Templating”. Expression Templating is a way by which we can mix literal text with one or more SpEL expressions and create a String template. At runtime the expressions in the template are replaced by actual value. Each expression in the String…… Continue reading Expression Templating Example
Projecting and Filtering collections in SpEL
In the previous post under Spring SpEL, I showed how to apply filtering and then projection on a collection in SpEL. In this post I will show with example how to apply projection and then filtering on a collection in SpEL. For our example I will use the below Pojo class Employee class package spel.package16;…… Continue reading Projecting and Filtering collections in SpEL
Filtering and Projecting collections in SpEL
In my previous two posts under Spring SpEL, I explained how to do filtering and projections using SpEL but separately. In this post I will show an example in which I will combine both filtering and projections technique in one SpEL. I will first do filtering on the collection and then on the result of…… Continue reading Filtering and Projecting collections in SpEL
Projecting maps in SpEL
In this post under SpEL, I will show with example how to project a specific field (key or value field) of a map. Below is the complete main code showing how to do it. Main class 1 package spel.package14; 2 3 import org.springframework.beans.factory.annotation.Value; 4 import org.springframework.context.ApplicationContext; 5 import org.springframework.context.annotation.AnnotationConfigApplicationContext; 6 import org.springframework.context.annotation.Bean; 7 import org.springframework.context.annotation.ComponentScan;…… Continue reading Projecting maps in SpEL
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