Let us now look into what do class, object and methods mean…..
Class − A class can be defined as a template or blueprint that describes the behavior or state that the object of its type supports.
Class structure
class class_name {
code block
}
Object − Objects have states and behaviors. Example: A dog has states -
color, name, breed as well as behavior such as wagging their tail, barking,
eating. An object is an instance of a class.
Methods − A method is
basically a behavior. A class can contain many methods. It is in methods where
the logics are written, data is manipulated and all the actions are executed.
- Group of instruction to do a specific task.
Examples:
- A method to add two numbers.
- A method to say Hi to the user.
- A method to get the user’s name.
- We have a special method called ‘Main’.
Method structure – Each
method consists of 4 main parts…
return_type method_name (parameter) {code block}
Note: Every method is written inside a class.
- A class is a container of methods.
Calling a method – is basically using the method
method_name (give parameter);
- Calling a method is a statement in java.
- The code block of this method will be executed.
Note: The main() method is automatically called
when we run our java program
- It is the first java method that is called.
- It is the starting point of execution of our program.
Examples of object, class and methods and their brief introduction. You will learn about these in a later chapters.
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