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.
In Java Fork Join Framework takes advantage of multiple processors to process divide and conquer algorithms with full power. In this post we’ll show how to start with Fork Join processing.
It’s very common task in Java to format double to 2 decimal places – usually to format currency. It’s not easy to do correctly, but in this post we’ll show how.
In this post we show Log4j example configuration that logs messages to a configured log file, and creates backups when needed.
In this post we show Log4j example configuration that logs messages to console (standard output), which is very useful when testing applications!
In Java int to String conversion can be done in a different ways and converted String can be in different formats. In this post we’ll show on examples how to convert them.
In Java String to int conversion can be done in a few different ways. In this post we’ll show them and describe differences.