Top 10 Free Java Courses for Beginners and Experienced Programmers

The Internet is full of useful resources and no matter what you want to learn there is something useful available for free. You just need to commit your time and effort. But at the same time, it's difficult to choose in the huge sea of free tutorials and courses on the internet. If you are not careful, you will spend most of your time browsing and changing courses without learning anything. That's where a curated list helps. Curation is my hobby and passion. I love to read books and courses which allows me to curate useful resources and share with you guys.

Java Enum With Constructor Example

Java Enum with Constructor

Many Java developers don't know that Java Enum can have a constructor to pass data while creating Enum constants. This feature allows you to associate related data together. One example of passing arguments to enum Constructor is our TrafficLight Enum where we pass action to each Enum instance e.g. GREEN is associate with go, RED is associated with stop and ORANGE is associated with the slow down. This is really useful because it provides more context and meaning to your code. If you want, you can also provide one or more constructor to your Enum as it also supports constructor overloading like normal Java classes. This is very different from enum you have seen in C or C++, which is just a collection of fixed thing without any OOP power.

How to Randomize a List in Java using Collections.shuffle() Example

The java.util.Collections class provides shuffle() method which can be used to randomize object stored in a List in Java. Since List is an ordered collection and maintains the order on which objects are inserted into it, you may need to randomize elements if you need them in a different order. Collections.shuffle() method uses default randomness to randomize element but you also have an overloaded version of shuffle() to provide an instance of the java.util.Random object, which can be used to randomize elements. Since this method except for fora List, you can also pass it to LinkedList, Vector, CopyOnWriteArrayList, and others, which doesn't implement the RandomAccess method.