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Java Abstraction

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naly moslih answered on June 22, 2020 Popularity 10/10 Helpfulness 3/10

answer Java Abstraction

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Java Abstraction

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abstract class Animal {
  public abstract void animalSound();
  public void sleep() {
    System.out.println("Zzz");
  }
}

Popularity 10/10 Helpfulness 3/10 Language java

Source: Grepper

Tags: abstraction java

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Contributed on May 23 2022

naly moslih

0 Answers Avg Quality 2/10

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abstraction in java

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Abstraction is nothing but the quality of dealing with ideas rather than 
events. It basically deals with hiding the internal details and showing 
the essential things to the user.

Popularity 10/10 Helpfulness 3/10 Language java

Source: Grepper

Tags: abstraction abst

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Contributed on Jun 22 2020

Vishal

0 Answers Avg Quality 2/10

abstraction java

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class MyMainEmployee{
    private int id;
    private String name;

    public MyMainEmployee(int id, String name){ // Constructor
        setId(id); // use abstraction to hide setter and for low coupling
        this.name = name;
    }

    private setId(int id){ // use setter and validator together
        if (id>=0){
            this.id = id;
        }
        else {
            throw IllegalArgumentException("Id cannot be negative");
        }
    }
}

Popularity 9/10 Helpfulness 3/10 Language java

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Tags: abstraction abst

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Contributed on Aug 05 2023

Innocent Iguana

0 Answers Avg Quality 2/10

java abstraction simple example

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java abstraction simple example

// ***** abstraction problem solved ********

abstract class shape{  // abstract class
	double a, b;
	shape(double a, double b){ // abstract class constructor
		this.a = a;
		this.b = b;
	}
	abstract void area();  // abstract class Method
}

class triangle extends shape{
	//a,b, area();  // Already abstract class property inheritance
	triangle(double a, double b){  // triangle constructor 
		super(a,b);  // super class used to code re-usability 
	}
	void area() {  // abstract method over-right to only void method
		double result = 0.5 * a * b;   // triangle formula
		System.out.println("Triangle area: " + result);
	}
}

class rectangle extends shape{
	//a,b, area(); // Already abstract class property inheritance
	rectangle(double a, double b){ // rectangle constructor 
		super(a,b); // super class used to code re-usability
	}
	void area() {
		double result = a * b; // rectangle formula
		System.out.println("Rectangle area: " + result);
	}
}


class circle extends shape{
	//a,b, area(); // Already abstract class property inheritance
	circle(double r){ // circle constructor but circle 1 parameter
		super(r,r);  // super class used to code re-usability but 2 parameter constructor 
	}
	void area() {
		double result = Math.PI * a * b; // circle formula
		System.out.println("Circle area: " + result);
	}
}
public class main{
	public static void main(String[] args) {
		shape obj;  // abstract class reference variable create
		
		obj = new rectangle(12, 34); // shape class reference variable to rectangle class 
		obj.area(); // rectangle class shape class abstract area() method over-right to rectangle class 
		
		obj = new triangle(12, 34); // shape class reference variable to triangle class
		obj.area(); // rectangle class shape class abstract area() method over-right to triangle class
		
		obj = new circle(12); // shape class reference variable to circle class
		obj.area(); // rectangle class shape class abstract area() method over-right to circle class
	}
}

Popularity 7/10 Helpfulness 2/10 Language java

Source: Grepper

Tags: abstraction java

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Contributed on Mar 29 2023

DM Lesar

0 Answers Avg Quality 2/10

what is abstraction in java

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Sometimes we may come across a situation
where we cannot provide implementation to
all the methods in a class. We want to leave the 
implementation to a class that extends it.
  In that case we declare a class
as abstract by using abstract keyword on method
signature.In my framework I have created my
PageBase class as super
class of the all page classes. 
I have collected all common elements
and functions into PageBase class and
all other page classes extent PageBase class.
By doing so, I don't have to locate very
common WebElements and it provides
reusability in my framework.
Also
1)Abstract classes cannot be instantiated
2)An abstarct classes contains abstract method,
concrete methods or both.
3)Any class which extends abstarct class must
  override all methods of abstract class
4)An abstarct class can contain either
  0 or more abstract method.

Popularity 10/10 Helpfulness 2/10 Language java

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Tags: abstract-class abst

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Contributed on Jan 05 2021

Obedient Ocelot

0 Answers Avg Quality 2/10

Java Abstraction

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