Access specifiers(modifiers) in java
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1]DEFAULT ACCESS SPECIFIER:
No keyword is required to specify default
access specifier
When no access modifier is specified for a
class, method or data member it is said to be
having the default access specifier by default.
Default access specifier are accessible within
the same package.](https://image.slidesharecdn.com/accessspecifiersmodifiersinjava-180819080119/85/Access-specifiers-modifiers-in-java-4-320.jpg)
![.2]PRIVATE ACCESS SPECIFIER:
The private access specifier is specified using the
keyword private.
The methods or data members declared as private
are accessible only within the class in which they are
declared.
Any other class of same package will not be able to
access these members.
Classes or interface can not be declared as private.](https://image.slidesharecdn.com/accessspecifiersmodifiersinjava-180819080119/85/Access-specifiers-modifiers-in-java-5-320.jpg)
![.3]PROTECTED ACCESS
SPECIFIER:
The protected access specifier is specified
using the keyword protected.
The methods or data members declared as
protected are accessible within same package
or sub classes in different package.](https://image.slidesharecdn.com/accessspecifiersmodifiersinjava-180819080119/85/Access-specifiers-modifiers-in-java-6-320.jpg)
![.4]PUBLIC ACCESS SPECIFIER:
The public access specifier is specified using the
keyword public.
The public access specifier has the widest scope
among all other access modifiers.
Classes, methods or data members which are
declared as public are accessible from every where in
the program. There is no restriction on the scope of
a public data members.](https://image.slidesharecdn.com/accessspecifiersmodifiersinjava-180819080119/85/Access-specifiers-modifiers-in-java-7-320.jpg)
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Access Modifiers: To set the access levels of variables,methods (members of a class) we use
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derived class or child class also.
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3. Protected
Public: When we declare a variable, method as public, it means that we can access those from
outside the class but within a program . When we inherit a class all public members of the class
will be accessible by the derived class.
Usage: Prefix the variable or method definition by the keyword public.
Example: public:
int x;
public:
void print();
Private: When we declare a variable, method as private, it means that we can access them only
within the class. Private variables of a class can be accessed only through getter and setter
methods which are public. By default the members of a class are private, if we do not specify any
access modifier it is considered to be private. This is concept used to achieve encapsulation.
Usage: Prefix the variable or method definition by the keyword private
Example: private:
int x;
public:
void setX();
Protected: When we declare a class, variable, method.,etc as public, it means that we can access
them within the class and the class with inherits it i.e,protected members can be accessed by the
derived class or child class also.
Usage: Prefix the variable or method definition by.Unit-4 Day1.pptx
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This document discusses abstraction and encapsulation in Scala. It defines abstraction as hiding internal details and showing only functionality. Abstraction can be achieved through abstract classes and interfaces/traits. Abstract classes can contain abstract and non-abstract methods, while interfaces contain only abstract methods. The document also discusses packages, which provide namespaces, and access modifiers like private, protected, and public, which restrict access to class members.3) Distinguish among various methods to implement access controlsSolut.docx
3) Distinguish among various methods to implement access controlsSolut.docxcarold12
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3) Distinguish among various methods to implement access controls
Solution
Answer
Generally access controls of Object oriented programing languages are public ,private, protect, default ,final, abstract .
In this we define as the final, abstract is called Non access Modifiers.
Access Modifiers are like public, private, default, protect.
Here we can use the access controls as at before the class name and method names. Generally Public can be used as the before the Class Declaration and Method Declaration. In method declaration, we can access method anywhere in the Class.
Private access is used before the variables names. We can use private as before declaration of variable in Class.
Protected this can be declared before the variable, that means it can be accessed by the that Class and its Subclasses.
Default access can be accessed that Class members and its subclasses.
Coming to the Point of Non Access modifier
Final it can be used before method name can但t be overridden.
Final it can be used before variable name can但t change.
Abstract method that not contains any defination.It can be implemented in is subclasses.
.Oops (inheritance&interface)
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27c
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- 1. ACCESS SPECIFIERS(MODIFIERS) IN JAVA PRESENTED BY : HRITHIK SHINDE PRAJWAL POOJARI MANNU VISHWAKARMA
- 2. DEFINATION : ACCESS SPECIFIERS Access specifiers(or access modifiers) are keywords in object-oriented languages that sets the accessibility of the classes , methods and others members
- 3. . THERE ARE 4 TYPES OF JAVA ACCESS SPECIFIERS: i. DEFAULT ii.PRIVATE iii.PROTECTED iv.PUBLIC
- 4. . 1]DEFAULT ACCESS SPECIFIER: No keyword is required to specify default access specifier When no access modifier is specified for a class, method or data member it is said to be having the default access specifier by default. Default access specifier are accessible within the same package.
- 5. .2]PRIVATE ACCESS SPECIFIER: The private access specifier is specified using the keyword private. The methods or data members declared as private are accessible only within the class in which they are declared. Any other class of same package will not be able to access these members. Classes or interface can not be declared as private.
- 6. .3]PROTECTED ACCESS SPECIFIER: The protected access specifier is specified using the keyword protected. The methods or data members declared as protected are accessible within same package or sub classes in different package.
- 7. .4]PUBLIC ACCESS SPECIFIER: The public access specifier is specified using the keyword public. The public access specifier has the widest scope among all other access modifiers. Classes, methods or data members which are declared as public are accessible from every where in the program. There is no restriction on the scope of a public data members.
- 8. ACCESS LEVELS Specifier Class Package Subclass Everywhere Default Y Y N N Private Y N N N Protected Y Y Y N Public Y Y Y Y