Syed Mainul Hasan on foojay.io - Friends of OpenJDK

All about Generics: Part 1

Sun, 20 Mar 2022 22:54:03 +0000

Generics are used to parameterize types. A piece of code can be written generically enough so that we can fit a variety of types in it. Being a strongly type-safe language, Java requires to specify types in all aspects of its code, methods, fields, interfaces, etc.

However, generics is one of the tricky ways to make it possible to use type parameterization so that one particular portion or entirely of a class or their subclass can support a variety of types if an entity such as class, interface, or method that operates on a parameterized type is said to be a generic entity.

Playing practically with Stream API

Wed, 16 Feb 2022 00:43:54 +0000

We can find many Stream API examples on Google, but most of them don’t represent real life scenarios. Hence, it often remains a black box to understand the power of the Stream API for many rising programmers.

In this article, I tried to make scenarios based problems where I have tried to make the solution with Stream API. These were initially for my personal practice purposes, and later, I added some more practice problems to demonstrate in my class at Pondit.

A Walk to Lazy Fetching With Hibernate and Spring Data JPA

Wed, 17 Nov 2021 11:47:30 +0000

Background

Using FetchType.EAGER is a very bad practice, since our services may not require all the data of the mapped entities in all cases. And moreover, it is a bad idea to fetch so much data in a single session and makes the session heavy.

Therefore we will refactor the code and use FetchType.LAZY.

Our old code for the entity was below:

After using FetchType.LAZY our new code will be like below: