In this tutorial we’ll see some examples of Collectors.groupingBy() method in Java Stream API. Collectors.groupingBy() method works similarly to “group by” statement in SQL which groups the elements as per the specified columns. This method also groups the elements according to the passed property and returns grouped result as a…
In this tutorial we’ll see how to use Collectors.joining() method to concatenate the input elements into a String. It is a handy utility method provided by the Collectors class in Java Stream API to quickly convert array elements or elements in a collection to String. There are three overloaded Collectors.joining()…
limit(long maxSize) method in the Java Stream API truncates the stream so that it is no longer than maxSize in length and returns the new stream with limited elements. limit method in Java Stream Syntax of the method is as given below. Stream<T> limit(long maxSize) Here maxSize is the limit…
In this article we’ll see how to read Excel file in Java using Apache POI library. If you have to write to an Excel file in Java you can check this post- Write to Excel File in Java Using Apache POI Table of contents Apache POI Maven dependencies for Apache…
In Java five keywords are used for exception handling namely – try, catch, finally, throw and throws. Out of these five, throw and throws keywords sound quite similar causing confusion thus the question what are the differences between throw and throws in Java exception handling. Throw vs Throws in java…
In the post try-catch block we have already seen some examples of exceptions but all those exceptions are thrown by Java run time. You may choose to throw an exception explicitly in your Java code, that can be done using throw statement in Java. General form of Java throw statement…
In the article Spring Boot Microservices example we saw an example of Spring Boot Microservice where we used Eureka for service registration and discovery. In this post we’ll extend that example further to see how to use both Eureka and Ribbon load balancer with Spring Boot to load the balance…
Spring Boot takes an opinionated view of the Spring platform and third-party libraries, so that you can get started quickly. It promises Rapid Application Development by providing a one-stop shop for all the Spring and related technologies that you need through Spring Boot starters. Using Spring Boot spring-boot-starter-parent in Spring…
In this article we’ll see a Spring Boot Microservices example with Eureka used for service registration and discovering the service. We’ll have two separate services User and Account developed as Microservices. With two microservices we’ll also see how to call one microservice from another using RestTemplate. When a large monolith…
skip(long n) method in the Java Stream API skips the first n element of the stream and returns a new stream consisting of the remaining elements of this stream. skip method in Java Stream Syntax of the method is as given below. Stream<T> skip(long n) Here n is the number…
