A pretty cool exercise in writing Java Regular Expressions is to write Java regex matching IP Address. In this post we’ll show IP regexp and use in IP Address validator.
We show how to remove duplicates from List in Java. Choose implementation depending on circumstances and with expected performance.
Java 8 regular expressions have been improved with names for capturing groups. In this post we show how to used them to improve Java code maintainability!
In Java 8 remove selected item from Collection? It can be done in at least two ways both of which we are going to implement here. Let’s code!
In Java random integers in range can be produced in many ways. In this post we show how to generate random numbers using Java 8 features!
How to generate in Java 8 range of numbers? This is practical problem, often met when writing tests. In this post we’ll cover fast implementation, comfortable, and flexible with Java 8 Streams!
Java interview question: In Java 8 count frequency of chars in a String. In this post we’ll show two implementations – using Map.merge() and Streams and Collectors.
In Java 8 count frequency of numbers/elements/objects. You may encounter this problem on Java job interviews. Here we implement it using Java 8 Collectors.
Very common task is creation of Map from a List of objects. In this post we show how to use Java 8 to convert List to Map using Collectors.
In this article we present Java 8 forEach on examples. These are very convenient methods for use with Lambda Expressions and method references.