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Calculate Percentage in Java 1. Introduction In this quick tutorial, we’re going to implement a CLI program to calculate percentage in Java. But first, let’s define how to calculate percentage mathematically. 2. Mathematical Formula In mathematics, a percentage is a number or ratio expressed as a fraction of 100. It’s often… Continue Reading java-calculate-percentage

Designing a User Friendly Java Library 1. Overview Java is one of the pillars of the open-source world. Almost every Java project uses other open-source projects since no one wants to reinvent the wheel. However, many times it happens that we need a library for its functionality but we have… Continue Reading design-a-user-friendly-java-library

How to Find all Getters Returning Null 1. Overview In this quick article, we’ll use the Java 8 Stream API and the Introspector class – to invoke all getters found in a POJO. We will create a stream of getters, inspect return values and see if a field value is… Continue Reading java-getters-returning-null

How to Run a Shell Command in Java 1. Overview With this tutorial we’ll illustrate the two ways of executing a shell command from within Java code. The first is to use the Runtime class and call its exec method. The second and more customizable way, will be to create… Continue Reading run-shell-command-in-java

A Guide to Inner Interfaces in Java 1. Introduction In this short tutorial, we’ll be looking at inner interfaces in Java. They are mainly used for: solving the namespacing issue when the interface has a common name increasing encapsulation increasing readability by grouping related interfaces in one place A well-known… Continue Reading java-inner-interfaces