This tutorial offers a brief overview of method references in Java, then gets you started using them with Java code examples.

You might know that Java passes by value, but it helps to understand why. Here's what happens when you pass mutable and immutable object references in Java.

Any multi-character text passed as an argument to the println method must be in “double quotes”, not ‘single quotes’. You can only use single-quotes to pass a single character to the println method.