Method hiding occurs when a subclass defines a class method with the same signature as a superclass class method. In that situation, the superclass's function is concealed by the subclass. It denotes that the version of a method that is run is NOT determined by the object that invokes it. Instead, it is determined by the underlying type of the object.
It is often referred to as "method shadowing." Using the new keyword, you may hide the implementation of a base class's methods from the derived class. With other words, in method hiding, you may use the new keyword to redefine the method of the base class in the derived class. This allows you to change what actions a derived class takes without changing the underlying code of the base class.
In C++, method hiding is done through the use of private inheritance. A public base class can contain private methods and members that can only be accessed by deriving classes. This ensures that a derived class cannot override a private method; instead, it creates its own version of the method with different parameters. Method hiding is also used in Java to avoid code duplication. The new operator is used to create a subclass that includes all the methods from another class.
Hiding methods is useful when you do not want to modify the behavior of the base class but instead want to provide a custom implementation for a method. For example, if you were writing an application that processed credit card numbers, you might decide to hide the boring details of how credit cards work and use the new method to define your own process for converting numbers from strings to integers. When users of your class need to perform operations with your credit card object that they could not do with regular cards, they can call the original method defined in the Card class.
What Variable Is Covered Up? Variable hiding occurs when we declare a variable with the same name in a child class as one specified in the parent class. A child class may declare a variable with the same name as an inherited variable from its parent class, so concealing the inherited variable. This is not always incorrect code; sometimes it can be used to prevent accidental overwriting of variables. However, if you do this, you must assign some value to the new variable, or else objects of the parent class will have their values changed inadvertently.
Variable hiding can also be used as a way for a programmer to extend the functionality of a class without changing the source code of the class. For example, let's say we have a parent class named Vehicle and a child class named Car. We could create a variable named color in the parent class and then declare a variable named color in the child class that is of type string - allowing it to store any kind of color (red, green, blue, etc.). Then, if we want to use the child class like a normal object, we would just have to make sure to send it through the function that accepts a parameter of type Vehicle before calling functions specific to Cars. This means that if we wanted to add support for colored headlights to our car, we could simply change the value of the color variable in the parent class and all cars would get colored headlights automatically.
The private access specifier is used to hide data.
Information Hiding is the process of concealing an object's implementation details. It is caused by encapsulation. Encapsulation is the practice of hiding the internal components and structure of something (such as a program or object) from direct access by users or other parts of the thing itself. It provides protection for such components because they are not directly exposed to users or other parts of the system.
Encapsulation is used to provide security by limiting how users can use an object. For example, if a car has been programmed so that it will only move when driven by its owner, this mechanism of protecting the car's engine is called "encapsulation". The car's control panel is protected because it cannot be accessed by anyone who does not know the key code for the car. However, the car's engine is still vulnerable to being damaged if the driver hits it with his/her hand or steps on the gas instead of the brake.
Although encapsulation protects components that users could potentially damage or harm, it also prevents them from seeing and using those components' essential features.
The technique of merging data and functions into a single unit is known as data hiding. Typically, data within a class is private, whereas functions are public. The data is concealed so that it cannot be accidentally manipulated. Private members/methods can only be accessible by class-defined methods. 5 Azar, 1399 AP Computer Science A, Second Edition.