Object Oriented Programming

Июль 27, 2022

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Object Oriented Programming

Содержание

2. Consider the following points Wrapper Classes Dates and Times Inheritance Encapsulation Polymorphism
3. Wrapper Classes
4. Converting from a String
5. Dates and Times
6. Periods
7. Formatting
8. Parsing Dates and Times
9. Inheritance Inheritance is the process by which the new child subclass automatically includes any public or
10. Encapsulation Encapsulation in Java is a mechanism of wrapping the data (variables) and code acting on
11. Access Modifiers public – from any class protected – from classes in the same package or
12. Polymorphism Polymorphism in Java is a concept by which we can perform a single action in
13. Overloading Should be different types of parameters numbers of parameters Can be different access modifiers optional
14. Order Java uses to choose the right overloaded method Exact match by type Larger primitive type
15. Overriding methods The method in the child class must have the same signature as the method
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Consider the following points
Wrapper Classes
Dates and Times
Inheritance
Encapsulation
Polymorphism

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Wrapper Classes

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Converting from a String

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Dates and Times

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Periods

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Formatting

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Parsing Dates and Times

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Inheritance
Inheritance is the process by which the new child subclass automatically

includes any public or protected primitives, objects or methods defined in the parent class.

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Encapsulation
Encapsulation in Java is a mechanism of wrapping the data (variables)

and code acting on the data (methods) together as a single unit. In encapsulation, the variables of a class will be hidden from other classes, and can be accessed only through the methods of their current class. Therefore, it is also known as data hiding.

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Access Modifiers
public – from any class
protected – from classes in the

same package or subclasses
default (package private) access - from classes in the same package
private – from within the same class

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Polymorphism
Polymorphism in Java is a concept by which we can perform

a single action in different ways.
There are two types of polymorphism in Java
compile-time
runtime

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Overloading
Should be different
types of parameters
numbers of parameters
Can be different
access modifiers
optional specifiers
return

types
exception lists

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Order Java uses to choose the right overloaded method
Exact match

by type
Larger primitive type
Autoboxed type
Varargs

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Overriding methods
The method in the child class must have

the same signature as the method in the parent class
The method in the child class must be at least as accessible or more accessible then the method in the parent class
If the method returns a value, it must be the same or a subclass of the method in the parent class, known as covariant return types
The method defined in the child class must be marked as static if it is marked as static in the parent class and otherwise.