An identifier is one that identifies something. In Java, variable name, interface name, class name, method name etc. are identifiers. E.g. in example no. 1, Hello is identifier and used as class name. You should also learn about what is class, object, variable, constructor and method in Java.
You may be interested in learning how to get input from user in Java.
To make your code easily readable, more understandable and easy to maintain for yourself as well as other programmers, Java naming conventions must be followed. Following is the list of standard Java naming conventions.
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