Method references in Java are part of the broader set of features introduced and enhanced in Java 8 and beyond. They are a concise way to refer to methods of classes or objects.

Therefore, even though Java passes parameters to methods by value, if the variable points to an object reference, the real object will also be changed.

Dot notation for package names The convention for packages is different from the Java naming conventions used for variables, methods and reference types. Packages are always written in lowercase ...

Objects in Java are always handled by reference, and so, for example: Local variables that refer to objects contain pointers from the stack frame of the Java method into the Java heap.