Java Chapter 04 - Writing Classes: part 3 DanWooster1
ย
This document discusses encapsulation and visibility modifiers in Java classes. It explains that encapsulation hides a class's internal details and exposes only its public services. Instance variables should be private to enforce encapsulation. Public methods provide a class's services while private support methods assist them. Accessor and mutator methods allow controlled data access and modification. Mutators can restrict variable modifications to valid ranges.
This chapter discusses object-oriented programming concepts like encapsulation, inheritance, polymorphism, abstract classes, and exception handling in Java. Encapsulation involves making data fields private and controlling access via public methods. Inheritance allows classes to extend existing classes and polymorphism means that subclasses can override methods of the parent class. Abstract classes cannot be instantiated and serve as a base for subclasses, while exceptions are used to handle errors.
Smu mscit sem 2 fall 2015 solved assignmentssmumbahelp
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Dear students get fully solved assignments
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There are three types of variables in Java: local variables, instance variables, and class/static variables. Local variables are declared within methods, constructors, or blocks and exist only within their scope. Instance variables are declared within a class but outside of methods and constructors, and each object instance has its own copy. Class/static variables are declared with the static keyword, and there is only one copy per class regardless of instances. Each variable type has different scopes, lifetimes, and ways of accessing them.
C# is a simple, modern, object-oriented, and type-safe programming language with a unified type system and support for versioning. It supports a variety of statements including blocks, declaration statements, expression statements, selection statements, iteration statements, jump statements, try-catch and try-finally statements, checked and unchecked statements, lock statements, and using statements. Classes are the most fundamental type in C# and combine state in the form of fields with actions in the form of methods and function members. Classes have both static and instance members.
The document discusses methods in Java. It defines a method as taking input, performing actions, and producing output. It notes that methods are defined within classes and have a general form of return type name(parameter list){method body}. The document provides an example of a main method with no parameters and an example of a class with a volume method that calculates and returns the volume of a box based on width, height, and depth fields.
Object oriented architecture organizes software around discrete objects that incorporate both data structures and behavior. This contrasts with procedural approaches that emphasize "doing" things rather than data. Objects have identifiable characteristics and behaviors, and are instances of classes. Classes group objects that share common properties and relationships. Key principles of object oriented architecture include identification, classification, polymorphism, inheritance, and abstraction. Object oriented methodology for ERP uses the Object Modeling Technique which involves problem analysis, system design, object design, and implementation. OMT uses three models - the object model describing system objects and relationships, the dynamic model describing system changes over time, and the functional model describing data value transformations.
Mahmudul Hasan provides contact information and an overview of topics covered in the document, including software installation on Windows, the first Java program, data types in Java, variables in Java, type casting, and Java operators. The document appears to be an introduction to programming concepts in Java, explaining fundamental elements like data types, variables, and operators. It includes examples and explanations of primitive and non-primitive data types, local, instance, and static variables, and type casting in Java. The document covers a variety of operator types in Java such as arithmetic, relational, logical, bitwise, assignment, and conditional operators.
Java Chapter 04 - Writing Classes: part 3 DanWooster1
ย
This document discusses encapsulation and visibility modifiers in Java classes. It explains that encapsulation hides a class's internal details and exposes only its public services. Instance variables should be private to enforce encapsulation. Public methods provide a class's services while private support methods assist them. Accessor and mutator methods allow controlled data access and modification. Mutators can restrict variable modifications to valid ranges.
This chapter discusses object-oriented programming concepts like encapsulation, inheritance, polymorphism, abstract classes, and exception handling in Java. Encapsulation involves making data fields private and controlling access via public methods. Inheritance allows classes to extend existing classes and polymorphism means that subclasses can override methods of the parent class. Abstract classes cannot be instantiated and serve as a base for subclasses, while exceptions are used to handle errors.
Smu mscit sem 2 fall 2015 solved assignmentssmumbahelp
ย
Dear students get fully solved assignments
Send your semester & Specialization name to our mail id :
โ help.mbaassignments@gmail.com โ
or
Call us at : 08263069601
There are three types of variables in Java: local variables, instance variables, and class/static variables. Local variables are declared within methods, constructors, or blocks and exist only within their scope. Instance variables are declared within a class but outside of methods and constructors, and each object instance has its own copy. Class/static variables are declared with the static keyword, and there is only one copy per class regardless of instances. Each variable type has different scopes, lifetimes, and ways of accessing them.
C# is a simple, modern, object-oriented, and type-safe programming language with a unified type system and support for versioning. It supports a variety of statements including blocks, declaration statements, expression statements, selection statements, iteration statements, jump statements, try-catch and try-finally statements, checked and unchecked statements, lock statements, and using statements. Classes are the most fundamental type in C# and combine state in the form of fields with actions in the form of methods and function members. Classes have both static and instance members.
The document discusses methods in Java. It defines a method as taking input, performing actions, and producing output. It notes that methods are defined within classes and have a general form of return type name(parameter list){method body}. The document provides an example of a main method with no parameters and an example of a class with a volume method that calculates and returns the volume of a box based on width, height, and depth fields.
Object oriented architecture organizes software around discrete objects that incorporate both data structures and behavior. This contrasts with procedural approaches that emphasize "doing" things rather than data. Objects have identifiable characteristics and behaviors, and are instances of classes. Classes group objects that share common properties and relationships. Key principles of object oriented architecture include identification, classification, polymorphism, inheritance, and abstraction. Object oriented methodology for ERP uses the Object Modeling Technique which involves problem analysis, system design, object design, and implementation. OMT uses three models - the object model describing system objects and relationships, the dynamic model describing system changes over time, and the functional model describing data value transformations.
Mahmudul Hasan provides contact information and an overview of topics covered in the document, including software installation on Windows, the first Java program, data types in Java, variables in Java, type casting, and Java operators. The document appears to be an introduction to programming concepts in Java, explaining fundamental elements like data types, variables, and operators. It includes examples and explanations of primitive and non-primitive data types, local, instance, and static variables, and type casting in Java. The document covers a variety of operator types in Java such as arithmetic, relational, logical, bitwise, assignment, and conditional operators.
The document discusses key concepts in object-oriented programming in Java including classes, objects, methods, constructors, and inheritance. Specifically, it explains that in Java, classes define the structure and behavior of objects through fields and methods. Objects are instances of classes that allocate memory at runtime. Methods define the behaviors of objects, and constructors initialize objects during instantiation. Inheritance allows classes to extend the functionality of other classes.
UNIT-2.pptx CS3391 Inheritance , types, packages and InterfacesSakkaravarthiS1
ย
This document discusses various Java concepts including method overloading, objects as parameters, returning objects, static, nested and inner classes, inheritance basics and types, the super keyword, method overriding and dynamic method dispatch, abstract classes, final with inheritance, packages and interfaces. It provides examples and explanations of each concept.
OOPS in java | Super and this Keyword | Memory Management in java | pacakages...Sagar Verma
ย
OOPS and its application in Java, Super class AND This Keyword,Java Bean, POJO ,Memory management in Java ,Packages ,Miscellaneous (Var-Args, toString(), Double equals operator(==))
This document discusses object-oriented programming concepts in Java such as classes, objects, inheritance, encapsulation, and polymorphism. It provides examples of defining classes with variables, methods, and constructors. It also covers creating and initializing objects, accessing instance variables and methods, and the different ways to create objects like using the new keyword, factory methods, and anonymous objects. The document also discusses strings, arrays, and core Java class libraries.
This document discusses objects and classes in Java. It begins by defining an object as an instance of a class that has state and behavior. An object's state is represented by its data fields and its behavior by its methods. It then defines a class as a template or blueprint from which objects are created. A class contains fields to represent state, methods to represent behavior, and constructors. The document provides examples of defining classes with fields and methods, creating objects from classes using the new operator, and accessing object fields and methods. It also covers access modifiers, packages, arrays of objects, and constructors in Java.
This document discusses classes in Java. It defines what a class is and how objects are created from classes. It explains the key concepts of methods, constructors, inheritance, overloading and overriding methods, access specifiers, and nested classes. The objectives are to design simple classes, create objects, implement methods and constructors, understand inheritance and the differences between overloading and overriding methods, and identify access specifiers and method modifiers.
Introduction to OOPS : Problems in procedure oriented approach, Features of Object Oriented
Programming System, Object creation, Initializing the instance variable, Constructors.
Classes, objects, methods, constructors, this keyword in javaTharuniDiddekunta
ย
The document discusses classes, objects, methods, constructors and the this keyword in Java. It defines that a class is a blueprint for objects and contains variables and methods, while an object is an instance of a class with state and behavior. It provides examples of creating a class with data members and methods, and then creating objects of that class. The document also covers access modifiers, different types of constructors like default, parameterized and overloaded constructors. It explains the differences between methods and constructors.
This document provides an overview of key concepts in Java including classes, objects, class members, packages, constructors, interfaces, abstract classes, object-oriented programming characteristics like encapsulation, inheritance, polymorphism and abstraction. It also discusses overriding, overloading, non-access modifiers, passing variables and strings. The presentation contains definitions and examples to explain each concept in 1-3 sentences.
BCA, Department of Information Technology and Software Development teaches JAVA Language in the fourth semester. The curriculum of the BCA Course of JIMS is very well updated. In this PDF, the Constructor topic is explained. It is one of the very important Concepts and you need to understand it thoroughly.
This document discusses objects, classes, and object-oriented programming concepts in Java, including:
- Objects contain data fields and methods, and have a state and behavior. A class defines the common properties and behaviors of objects.
- Classes contain attributes like instance variables and methods. Objects are instantiated from classes using the new operator. Methods can access and modify an object's attributes.
- Access modifiers like public and private control visibility and accessibility of class members. Getter and setter methods are used to access private attributes. Constructors initialize new objects.
INDUMATHY- UNIT 1 cs3391 oops introduction to oop and java.pptxIndu65
ย
This document provides an introduction to Java programming language and some of its core concepts. It discusses:
- The origins and features of Java like being architecture neutral, robust, multithreaded, object-oriented, platform independent, simple and secure.
- Basic Java syntax including classes, objects, methods, and variables.
- Key object-oriented programming concepts in Java like encapsulation, inheritance, polymorphism and abstraction.
- Examples of basic Java programs and code snippets demonstrating classes, objects, methods, variables and data types.
- Common programming structures in Java like control statements, operators, and constructors.
This document discusses defining classes in Java. It covers defining classes with instance variables, constructors, methods and visibility modifiers. It also discusses encapsulation, objects, scope and lifetime of variables, and using classes to represent graphical shapes. The document provides examples of a Student class and a Circle class to illustrate these concepts.
The document provides definitions and explanations of various object-oriented programming concepts in Delphi such as classes, objects, visibility of class members, inheritance, abstract classes, interfaces, constructors, virtual functions, polymorphism, late binding, encapsulation, properties, exceptions handling, and runtime type information (RTTI). It discusses these concepts through questions and answers. Key points covered include the relationship between classes and objects, differences between visibility levels of class members, how inheritance allows the creation of subclasses, rules around abstract classes and methods, limitations of interfaces, how to define and overload constructors and functions, use of virtual functions and polymorphism, and how RTTI is used.
Reflection in Java allows programs to inspect and modify classes, fields, methods, and constructors at runtime without knowing the names or types of said classes, fields, methods, or constructors at compile time. The lecture discusses the core reflection classes like Class, Field, Method, Constructor, and AccessibleObject. It demonstrates how to use reflection to get information about a class like its fields and methods, as well as how to invoke methods, get/set field values, and create new instances of classes using reflection on an example ATM class. Arrays can also be manipulated using reflection through the Array class.
The document provides information about object-oriented programming concepts in Java including objects, classes, constructors, and access modifiers. It defines an object as having state, behavior, and identity. A class is described as a template or blueprint for creating objects that share common properties. The document discusses default and parameterized constructors. It also covers the static keyword in relation to variables, methods, blocks, and nested classes. Other topics include finalizer methods, import statements, and the four levels of access control in Java.
Introduction to Classes and Objects in Java - EdufectEdufect
ย
Learn about how to create a class and object in Java. Edufect (www.edufect.com) provides Perfect Java, the best Java course. Edufect is the best institute for Java, Android, Python.
Class is a blueprint for creating object instances that share common attributes and behaviors. It defines the variables and methods that are common to all objects of that class. When an object is created from a class, it is said to be an instance of that class. Objects contain state in the form of attributes and behavior in the form of methods. Classes in Java can define access levels for variables and methods as public, private, protected, or without a specified level (default).
The document discusses key concepts in object-oriented programming in Java including classes, objects, methods, constructors, and inheritance. Specifically, it explains that in Java, classes define the structure and behavior of objects through fields and methods. Objects are instances of classes that allocate memory at runtime. Methods define the behaviors of objects, and constructors initialize objects during instantiation. Inheritance allows classes to extend the functionality of other classes.
UNIT-2.pptx CS3391 Inheritance , types, packages and InterfacesSakkaravarthiS1
ย
This document discusses various Java concepts including method overloading, objects as parameters, returning objects, static, nested and inner classes, inheritance basics and types, the super keyword, method overriding and dynamic method dispatch, abstract classes, final with inheritance, packages and interfaces. It provides examples and explanations of each concept.
OOPS in java | Super and this Keyword | Memory Management in java | pacakages...Sagar Verma
ย
OOPS and its application in Java, Super class AND This Keyword,Java Bean, POJO ,Memory management in Java ,Packages ,Miscellaneous (Var-Args, toString(), Double equals operator(==))
This document discusses object-oriented programming concepts in Java such as classes, objects, inheritance, encapsulation, and polymorphism. It provides examples of defining classes with variables, methods, and constructors. It also covers creating and initializing objects, accessing instance variables and methods, and the different ways to create objects like using the new keyword, factory methods, and anonymous objects. The document also discusses strings, arrays, and core Java class libraries.
This document discusses objects and classes in Java. It begins by defining an object as an instance of a class that has state and behavior. An object's state is represented by its data fields and its behavior by its methods. It then defines a class as a template or blueprint from which objects are created. A class contains fields to represent state, methods to represent behavior, and constructors. The document provides examples of defining classes with fields and methods, creating objects from classes using the new operator, and accessing object fields and methods. It also covers access modifiers, packages, arrays of objects, and constructors in Java.
This document discusses classes in Java. It defines what a class is and how objects are created from classes. It explains the key concepts of methods, constructors, inheritance, overloading and overriding methods, access specifiers, and nested classes. The objectives are to design simple classes, create objects, implement methods and constructors, understand inheritance and the differences between overloading and overriding methods, and identify access specifiers and method modifiers.
Introduction to OOPS : Problems in procedure oriented approach, Features of Object Oriented
Programming System, Object creation, Initializing the instance variable, Constructors.
Classes, objects, methods, constructors, this keyword in javaTharuniDiddekunta
ย
The document discusses classes, objects, methods, constructors and the this keyword in Java. It defines that a class is a blueprint for objects and contains variables and methods, while an object is an instance of a class with state and behavior. It provides examples of creating a class with data members and methods, and then creating objects of that class. The document also covers access modifiers, different types of constructors like default, parameterized and overloaded constructors. It explains the differences between methods and constructors.
This document provides an overview of key concepts in Java including classes, objects, class members, packages, constructors, interfaces, abstract classes, object-oriented programming characteristics like encapsulation, inheritance, polymorphism and abstraction. It also discusses overriding, overloading, non-access modifiers, passing variables and strings. The presentation contains definitions and examples to explain each concept in 1-3 sentences.
BCA, Department of Information Technology and Software Development teaches JAVA Language in the fourth semester. The curriculum of the BCA Course of JIMS is very well updated. In this PDF, the Constructor topic is explained. It is one of the very important Concepts and you need to understand it thoroughly.
This document discusses objects, classes, and object-oriented programming concepts in Java, including:
- Objects contain data fields and methods, and have a state and behavior. A class defines the common properties and behaviors of objects.
- Classes contain attributes like instance variables and methods. Objects are instantiated from classes using the new operator. Methods can access and modify an object's attributes.
- Access modifiers like public and private control visibility and accessibility of class members. Getter and setter methods are used to access private attributes. Constructors initialize new objects.
INDUMATHY- UNIT 1 cs3391 oops introduction to oop and java.pptxIndu65
ย
This document provides an introduction to Java programming language and some of its core concepts. It discusses:
- The origins and features of Java like being architecture neutral, robust, multithreaded, object-oriented, platform independent, simple and secure.
- Basic Java syntax including classes, objects, methods, and variables.
- Key object-oriented programming concepts in Java like encapsulation, inheritance, polymorphism and abstraction.
- Examples of basic Java programs and code snippets demonstrating classes, objects, methods, variables and data types.
- Common programming structures in Java like control statements, operators, and constructors.
This document discusses defining classes in Java. It covers defining classes with instance variables, constructors, methods and visibility modifiers. It also discusses encapsulation, objects, scope and lifetime of variables, and using classes to represent graphical shapes. The document provides examples of a Student class and a Circle class to illustrate these concepts.
The document provides definitions and explanations of various object-oriented programming concepts in Delphi such as classes, objects, visibility of class members, inheritance, abstract classes, interfaces, constructors, virtual functions, polymorphism, late binding, encapsulation, properties, exceptions handling, and runtime type information (RTTI). It discusses these concepts through questions and answers. Key points covered include the relationship between classes and objects, differences between visibility levels of class members, how inheritance allows the creation of subclasses, rules around abstract classes and methods, limitations of interfaces, how to define and overload constructors and functions, use of virtual functions and polymorphism, and how RTTI is used.
Reflection in Java allows programs to inspect and modify classes, fields, methods, and constructors at runtime without knowing the names or types of said classes, fields, methods, or constructors at compile time. The lecture discusses the core reflection classes like Class, Field, Method, Constructor, and AccessibleObject. It demonstrates how to use reflection to get information about a class like its fields and methods, as well as how to invoke methods, get/set field values, and create new instances of classes using reflection on an example ATM class. Arrays can also be manipulated using reflection through the Array class.
The document provides information about object-oriented programming concepts in Java including objects, classes, constructors, and access modifiers. It defines an object as having state, behavior, and identity. A class is described as a template or blueprint for creating objects that share common properties. The document discusses default and parameterized constructors. It also covers the static keyword in relation to variables, methods, blocks, and nested classes. Other topics include finalizer methods, import statements, and the four levels of access control in Java.
Introduction to Classes and Objects in Java - EdufectEdufect
ย
Learn about how to create a class and object in Java. Edufect (www.edufect.com) provides Perfect Java, the best Java course. Edufect is the best institute for Java, Android, Python.
Class is a blueprint for creating object instances that share common attributes and behaviors. It defines the variables and methods that are common to all objects of that class. When an object is created from a class, it is said to be an instance of that class. Objects contain state in the form of attributes and behavior in the form of methods. Classes in Java can define access levels for variables and methods as public, private, protected, or without a specified level (default).
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This document discusses third and fourth generation programming languages. Third generation languages (3GLs) are machine-independent and can be compiled to run on many devices. Some early 3GLs from the 1950s include FORTRAN, ALGOL, and COBOL. High-level languages can be either compiled or interpreted. Fourth generation languages (4GLs) use more human-like statements and require less coding than lower-level languages. Examples of 4GLs include Perl, PHP, Python, Ruby, and SQL. 4GLs offer advantages like easier learning, maintenance, and development speed, while sometimes suffering from slower execution speed and increased memory usage.
This document contains source code for creating an analog clock application in C# using computer graphics. It includes code to draw the clock face, rotate clock hands based on the current time, and update the display every second using a timer tick event. The clock displays the current time with the hour, minute and second hands.
The document provides instructions for creating a 3D bowling pin and ball using Autodesk 3Ds MAX 2013. It first defines what 3D computer graphics are. It then explains that it will use a real bowling pin as reference to draw half its outline with lines, and smooth the vertices to curve the lines. The bottom curve is then changed to a line. A lathe modifier is added to create the pin shape. Finally, it states it will make a bowling ball by selecting a sphere primitive.
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(๐๐๐ ๐๐๐) (๐๐๐ฌ๐ฌ๐จ๐ง ๐)-๐๐ซ๐๐ฅ๐ข๐ฆ๐ฌ
๐๐ข๐ฌ๐๐ฎ๐ฌ๐ฌ ๐ญ๐ก๐ ๐๐๐ ๐๐ฎ๐ซ๐ซ๐ข๐๐ฎ๐ฅ๐ฎ๐ฆ ๐ข๐ง ๐ญ๐ก๐ ๐๐ก๐ข๐ฅ๐ข๐ฉ๐ฉ๐ข๐ง๐๐ฌ:
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๐๐ฑ๐ฉ๐ฅ๐๐ข๐ง ๐ญ๐ก๐ ๐๐๐ญ๐ฎ๐ซ๐ ๐๐ง๐ ๐๐๐จ๐ฉ๐ ๐จ๐ ๐๐ง ๐๐ง๐ญ๐ซ๐๐ฉ๐ซ๐๐ง๐๐ฎ๐ซ:
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This presentation was provided by Rebecca Benner, Ph.D., of the American Society of Anesthesiologists, for the second session of NISO's 2024 Training Series "DEIA in the Scholarly Landscape." Session Two: 'Expanding Pathways to Publishing Careers,' was held June 13, 2024.
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Andreas Schleicher, Director of Education and Skills at the OECD presents at the launch of PISA 2022 Volume III - Creative Minds, Creative Schools on 18 June 2024.
BรI TแบฌP Dแบ Y THรM TIแบพNG ANH LแปP 7 Cแบข NฤM FRIENDS PLUS SรCH CHรN TRแปI SรNG Tแบ O ...
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OOP using java (Variable in java)
1. OOP - JAVA
Variables in Java
4/6/2022 1
Department of Computer
PRO โ GRADE 5
Lecturer. OMEED M. M
2. Table of contents
๏ถ What is Variable?
๏ถ Allocating memory
๏ถ Types of variables
๏ถ Constructor
4/6/2022 2
3. Variable in Java
Variables used to store in our computerโs memory
Why called it variable?
Because the values inside the variables are changeable.
๏ผ Attributes - things that the object stores data in, generally
variables.
๏ผ Methods - Functions and Procedures attached to an Object and
allowing the object to perform actions
4/6/2022 3
4. Allocating memory
In order to store some data in our computer memory we have to
allocate some space so how we can do that? we will go through
allocating memory,
4/6/2022 4
5. Allocating memory
For this purpose we have to declare variables.
How we can declare variable we are going to using assignment
We can assign a value to a variable by using (Equal =) operator.
Ex.
String ANY_NAME = โANY_NAMEโ
4/6/2022 5
8. Types of variables
There are Three type of variables:-
1. Instance variables
2. Local variables
3. Class variables (Static variables)
4/6/2022 8
9. Instance variables
Instance variables Declared inside class but not inside method.
Ex.
Class test{
Int data=15; //instance variable
Float pi=3.114f; //instance variable
}
Cannot be reinitialized directly within class
Ex.
Class test{
Int data=15; //instance variable
data =20; //Error for correction we have to put it into a method
void testMethod(){
data=20 // correct;
} }
4/6/2022 9
10. Local variables
Local variables โ Declared inside method or method parameters.
Ex.
Int areatest (int radius){
Int total = radius * radius;
Return total;
}
-These are not accessible outside method.
-They did not get default values.
4/6/2022 10
11. Class / Static variables
Class variables โ are variables declared within a class, outside any
method, with the static keyword
-Static variable is shared between all objects because it belong to
the class. It does not belong to the object
-A static variable can be accessed without creating an instance of the
class.
4/6/2022 11
12. Constructor
A constructor in Java is similar to a method that is invoked when an
object of the class is created.
Unlike Java methods, a constructor has the same name as that of the
class and does not have any return type. For example,
class Test {
Test() {
// constructor body
}
}
4/6/2022 12
13. Types of variables
class A{
int date=50; //_________ variable
static int m=100; //_________ variable
void method(){
int n=90; //________ variable
}
} //end of class
4/6/2022 13