Java 8 – How to sort list with stream.sorted()
Few examples to show you how to sort a List with stream.sorted(): Sort a List with Comparator.naturalOrder(), Sort a List with Comparator.reverseOrder(), Sort a List user objects.
Java – How to declare and initialize an Array
Few Java examples to declare, initialize and manipulate Array in Java: Declares Array for primitive types, Declares array for classes or objects like String.class, Initialize array from method return an…
Java 8 – Convert List to Map
Few Java 8 examples to show you how to convert a List of objects into a Map, and how to handle the duplicated keys.
How to get the environment variables in Java
In Java, the System.getenv() returns an unmodifiable string Map view of the current system environment. If a requested environment variable is not defined, the System.getenv will return a null, and…
How to sort a Map in Java
Few Java examples to sort a Map by its keys or values: (1) Uses java.util.TreeMap, it will sort the Map by keys automatically, (2) Yet another java.util.TreeMap example, provide a…
Java 8 – How to sort a Map
Java 8 Stream examples to sort a Map, by keys or by values. Steps to sort a Map in Java 8: (1) Convert a Map into a Stream, (2) Sort…