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When writing about methods in Java (i.e. in forums, mailing lists, issue trackers, etc.) many people separate the method name from the class name using the '#' symbol instead of Java's native . operator; for example, folks refer to Object#toString instead of Object.toString. Where does this syntax come from?
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Why do we use? A Class is a construct that is used to create instances of itself. Members of a class can be fields and methods that enable an object of the class to maintain state and behavior respectively. ... Meaning, to have objects in object-oriented programing , you need to instantiate a class .
Classes are required in OOPs because: It provides template for creating objects, which can bind code into data. It has definitions of methods and data. It supports inheritance property of Object Oriented Programming and hence can maintain class hierarchy.
Functions do specific things, classes are specific things. Classes often have methods, which are functions that are associated with a particular class, and do things associated with the thing that the class is - but if all you want is to do something, a function is all you need.
A class defines object properties including a valid range of values, and a default value. A class also describes object behavior. An object is a member or an "instance" of a class. An object has a state in which all of its properties have values that you either explicitly define or that are defined by default settings.
It's the notation used in javadoc comments when linking to another class' method.
EDIT
To gather the additional information provided in comments:
# notation in turn comes from HTML anchorsObject.method is the Java syntax to call static methods, which could be misleadingUPDATE
Java 8 brings a new syntax for method references, which now seems to become more popular - so Object#toString tends to now be written Object::toString.
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