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Java 8 has introduced many features, and the forEach() method is one of them. In short, it's a way to iterate over a Collection (for example, a map, a set or a list) or a Stream. The forEach() takes only one parameter, which is a functional inter...
In Java Generic programming, ? refers to a wildcard. If you're wondering what is a wild card, thinking about card games is a great way to understand its meaning. According to Cambridge Dictionary, a wild card is: A playing card that does not have an...
< T > is a conventional letter that stands for "Type", and it refers to the concept of Generics in Java. You can use any letter, but you'll see that 'T' is widely preferred. WHAT DOES GENERIC MEAN? Generic is a way to parameterize a class, method, or...
If you use Java as your primary programming language, you've come across a NullPointerException at some point in your life. At a very high level, a NullPointerException is a RuntimeException that happens when you try to access a variable, but this va...
The :: operator refers to a method reference. In one of my previous posts, I wrote an article about lambda expressions. A method reference is a simplified way of writing a lambda expression in order to call a method. Method references allow you to c...
It's September, which means that university courses will start soon. If I could go back with a time machine, I wish I knew these 5 things: COMPUTER SCIENCE REQUIRES EXTRA TIME OUTSIDE OF THE LECTURES At uni, you are given assignments, and once lect...
