When we consider a Java program, it can be defined as a collection of objects that communicate via invoking each other's methods. Let us now briefly look into what do class, object, methods and instance variables mean. · Object - Objects have states and behaviours. Example: A dog has states-colour, name, and breed as well as behaviours -wagging, barking, and eating. An object is an instance of a class. · Class - A class can be defined as a template/blue print that describes the behaviours/states that object of its type support. · Methods - A method is basically behaviour. A class can contain many methods. It is in methods where the logics are written, data is manipulated and all the actions are executed. · Instance Variables - Each object has its unique set of instance variables. An object's state is created by the values assigned to these instance variables. First Java Program: Let us look at a simple code that would print the words Hel