This keyword is a reference variable that refer the current object in java.
This keyword can be used for call current class constructor.
http://www.tutorial4us.com/java/java-this-keyword
Java abstract class & abstract methods,Abstract class in java
Abstract classes are classes that contain one or more abstract methods. An abstract method is a method that is declared, but contains no implementation. Abstract classes may not be instantiated, and require subclasses to provide implementations for the abstract methods.
Abstraction is a process by which concepts are derived from the usage and classification of literal ("real" or "concrete") concepts.
Abstraction is a concept that acts as a super-categorical noun for all subordinate concepts, and connects any related concepts as a group, field, or category.
This keyword is a reference variable that refer the current object in java.
This keyword can be used for call current class constructor.
http://www.tutorial4us.com/java/java-this-keyword
Java abstract class & abstract methods,Abstract class in java
Abstract classes are classes that contain one or more abstract methods. An abstract method is a method that is declared, but contains no implementation. Abstract classes may not be instantiated, and require subclasses to provide implementations for the abstract methods.
Abstraction is a process by which concepts are derived from the usage and classification of literal ("real" or "concrete") concepts.
Abstraction is a concept that acts as a super-categorical noun for all subordinate concepts, and connects any related concepts as a group, field, or category.
An abstract class is a class that is declared abstract —it may or may not include abstract methods. Abstract classes cannot be instantiated, but they can be subclassed. When an abstract class is subclassed, the subclass usually provides implementations for all of the abstract methods in its parent class.
This presentation introduces some concepts about the Java Collection framework. These slides introduce the following concepts:
- Collections and iterators
- Linked list and array list
- Hash set and tree set
- Maps
- The collection framework
The presentation is took from the Java course I run in the bachelor-level informatics curriculum at the University of Padova.
Java OOP Programming language (Part 6) - Abstract Class & InterfaceOUM SAOKOSAL
Java OOP Programming language (Part 6) - Abstract Class & Interface
Oum Saokosal
Where to me find me more:
YouTube: https://www.youtube.com/user/oumsaokosal
FB Page: https://facebook.com/kosalgeek
PPT: https://www.slideshare.net/oumsaokosal
Twitter: https://twitter.com/okosal
Web: http://kosalgeek.com
In this you learn about Control Statements
1. Selection Statements
i. If
ii. If-else
iii. Nested-if
iv. If-Elseif ladder
2. Looping Statements
i. while loop
ii. do-while loop
iii. For loop
3. Jumping Statements
i. break
ii. continue
iii return
What Are Access Modifiers ?
Access modifiers are keywords used to specify the declared accessibility of a member or a type.
Access modifiers support the concept of encapsulation, which promotes the idea of hiding functionality.
Access modifiers allow you to define who does or doesn't have access to certain features.
Types Of Access Modifiers:
public
protected
internal
private
An abstract class is a class that is declared abstract —it may or may not include abstract methods. Abstract classes cannot be instantiated, but they can be subclassed. When an abstract class is subclassed, the subclass usually provides implementations for all of the abstract methods in its parent class.
This presentation introduces some concepts about the Java Collection framework. These slides introduce the following concepts:
- Collections and iterators
- Linked list and array list
- Hash set and tree set
- Maps
- The collection framework
The presentation is took from the Java course I run in the bachelor-level informatics curriculum at the University of Padova.
Java OOP Programming language (Part 6) - Abstract Class & InterfaceOUM SAOKOSAL
Java OOP Programming language (Part 6) - Abstract Class & Interface
Oum Saokosal
Where to me find me more:
YouTube: https://www.youtube.com/user/oumsaokosal
FB Page: https://facebook.com/kosalgeek
PPT: https://www.slideshare.net/oumsaokosal
Twitter: https://twitter.com/okosal
Web: http://kosalgeek.com
In this you learn about Control Statements
1. Selection Statements
i. If
ii. If-else
iii. Nested-if
iv. If-Elseif ladder
2. Looping Statements
i. while loop
ii. do-while loop
iii. For loop
3. Jumping Statements
i. break
ii. continue
iii return
What Are Access Modifiers ?
Access modifiers are keywords used to specify the declared accessibility of a member or a type.
Access modifiers support the concept of encapsulation, which promotes the idea of hiding functionality.
Access modifiers allow you to define who does or doesn't have access to certain features.
Types Of Access Modifiers:
public
protected
internal
private
Water scarcity is the lack of fresh water resources to meet the standard water demand. There are two type of water scarcity. One is physical. The other is economic water scarcity.
Overview of the fundamental roles in Hydropower generation and the components involved in wider Electrical Engineering.
This paper presents the design and construction of hydroelectric dams from the hydrologist’s survey of the valley before construction, all aspects and involved disciplines, fluid dynamics, structural engineering, generation and mains frequency regulation to the very transmission of power through the network in the United Kingdom.
Author: Robbie Edward Sayers
Collaborators and co editors: Charlie Sims and Connor Healey.
(C) 2024 Robbie E. Sayers
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Student information management system project report ii.pdfKamal Acharya
Our project explains about the student management. This project mainly explains the various actions related to student details. This project shows some ease in adding, editing and deleting the student details. It also provides a less time consuming process for viewing, adding, editing and deleting the marks of the students.
Welcome to WIPAC Monthly the magazine brought to you by the LinkedIn Group Water Industry Process Automation & Control.
In this month's edition, along with this month's industry news to celebrate the 13 years since the group was created we have articles including
A case study of the used of Advanced Process Control at the Wastewater Treatment works at Lleida in Spain
A look back on an article on smart wastewater networks in order to see how the industry has measured up in the interim around the adoption of Digital Transformation in the Water Industry.
Hybrid optimization of pumped hydro system and solar- Engr. Abdul-Azeez.pdffxintegritypublishin
Advancements in technology unveil a myriad of electrical and electronic breakthroughs geared towards efficiently harnessing limited resources to meet human energy demands. The optimization of hybrid solar PV panels and pumped hydro energy supply systems plays a pivotal role in utilizing natural resources effectively. This initiative not only benefits humanity but also fosters environmental sustainability. The study investigated the design optimization of these hybrid systems, focusing on understanding solar radiation patterns, identifying geographical influences on solar radiation, formulating a mathematical model for system optimization, and determining the optimal configuration of PV panels and pumped hydro storage. Through a comparative analysis approach and eight weeks of data collection, the study addressed key research questions related to solar radiation patterns and optimal system design. The findings highlighted regions with heightened solar radiation levels, showcasing substantial potential for power generation and emphasizing the system's efficiency. Optimizing system design significantly boosted power generation, promoted renewable energy utilization, and enhanced energy storage capacity. The study underscored the benefits of optimizing hybrid solar PV panels and pumped hydro energy supply systems for sustainable energy usage. Optimizing the design of solar PV panels and pumped hydro energy supply systems as examined across diverse climatic conditions in a developing country, not only enhances power generation but also improves the integration of renewable energy sources and boosts energy storage capacities, particularly beneficial for less economically prosperous regions. Additionally, the study provides valuable insights for advancing energy research in economically viable areas. Recommendations included conducting site-specific assessments, utilizing advanced modeling tools, implementing regular maintenance protocols, and enhancing communication among system components.
Saudi Arabia stands as a titan in the global energy landscape, renowned for its abundant oil and gas resources. It's the largest exporter of petroleum and holds some of the world's most significant reserves. Let's delve into the top 10 oil and gas projects shaping Saudi Arabia's energy future in 2024.
Gen AI Study Jams _ For the GDSC Leads in India.pdf
this keyword in Java.pptx
1. This keyword in Java
1. this can be used to refer current class instance variable.
2. this can be used to invoke current class method (implicitly)
3. this() can be used to invoke current class constructor.
4. this can be passed as an argument in the method call.
5. this can be passed as argument in the constructor call.
6. this can be used to return the current class instance from the method.
2.
3. Java static keyword
1. Variable (also known as a class variable)
2. Method (also known as a class method)
3. Block
4. Nested class
The static keyword belongs to the class than an instance of the class. If it were a non-static
method, JVM creates an object first then call main() method that will lead the problem of
extra memory allocation.
4.
5. Java static block
1. Is used to initialize the static data member.
2. It is executed before the main method at the time of classloading.
class Example{
static{System.out.println("static block is invoked");}
public static void main(String args[]){
System.out.println("Hello main");
}
}
6. Java static block rules
1. It executes during class loading
2. It can only use static variables
3. It can not use this
4. It executes only once during the entire execution of the program when the
class loads into the memory
8. Interfaces in Java
In java, an interface is similar to a class, but it contains abstract methods and static final variables only.
🔔 An interface is a container of abstract methods and static final variables.
🔔 An interface, implemented by a class. (class implements interface).
🔔 An interface may extend another interface. (Interface extends Interface).
🔔 An interface never implements another interface, or class.
🔔 A class may implement any number of interfaces.
🔔 We can not instantiate an interface.
🔔 Specifying the keyword abstract for interface methods is optional, it automatically added.
🔔 All the members of an interface are public by default.
9. interface HumanInterfaceExample {
void learn(String str);
void work();
int duration = 10;
}
Converted code
interface HumanInterfaceExample {
public abstract void learn(String
str);
public abstract void work();
public static final int duration =
10;
}
10. Difference Between Class and Interface
S.
No.
Class Interface
1. In class, you can instantiate variables and create an object.
In an interface, you can’t instantiate variables and
create an object.
2. Class can contain concrete(with implementation) methods
The interface cannot contain concrete(with
implementation) methods
3.
The access specifiers used with classes are private,
protected, and public.
In Interface only one specifier is used- Public.
11. Java Abstract Class
An abstract class is a class that created using abstract keyword. In other words, a class prefixed with abstract
keyword is known as an abstract class.
In java, an abstract class may contain abstract methods (methods without implementation) and also non-abstract
methods (methods with implementation).
Syntax
abstract class <ClassName>{
...
}
12. Java Abstract Class Rules
● An abstract class must be created with abstract keyword.
● An abstract class can be created without any abstract method.
● An abstract class may contain abstract methods and non-abstract methods.
● An abstract class may contain final methods that can not be overridden.
● An abstract class may contain static methods, but the abstract method can not be static.
● An abstract class may have a constructor that gets executed when the child class object
created.
● An abstract method must be overridden by the child class, otherwise, it must be defined as an
abstract class.
● An abstract class can not be instantiated but can be referenced.