java abstract class
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 such case we declare a class
as abstract.To make a class abstract we use key word abstract.
Any class that contains one or more abstract methods is declared as abstract.
If we don’t declare class as abstract which contains abstract methods we get
compile time error.
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.
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4.17
6
An abstract method is the method which does’nt have any body.
Abstract method is declared with
keyword abstract and semicolon in place of method body.
public abstract void <method name>();
Ex : public abstract void getDetails();
It is the responsibility of subclass to provide implementation to
abstract method defined in abstract class
Thank you!
6
4.17
(6 Votes)
0
4.14
7
// abstract class
abstract class Shape
{
// abstract method
abstract void sides();
}
class Triangle extends Shape
{
void sides()
{
System.out.println("Triangle shape has three sides.");
}
}
class Pentagon extends Shape
{
void sides()
{
System.out.println("Pentagon shape has five sides.");
}
public static void main(String[] args)
{
Triangle obj1 = new Triangle();
obj1.sides();
Pentagon obj2 = new Pentagon();
obj2.sides();
}
}
Thank you!
7
4.14
(7 Votes)
0
4.43
7
public abstract class Account { //abstract class //perent class
protected int accountNumber;
protected Customer customerObj;
protected double balance;
//constructor
public Account(int saccountNumber, Customer scustomerObj,double sbalance){
accountNumber = saccountNumber;
customerObj = scustomerObj;
balance = sbalance;
}
// abstract Function
public abstract boolean withdraw(double amount);
}
public class SavingsAccount extends Account { // child class
private double minimumBalance;
// constructor
public SavingsAccount(int saccountNumber, Customer scustomerObj, double sbalance, double sminimumBalance) {
super(saccountNumber, scustomerObj, sbalance);
minimumBalance = sminimumBalance;
}
// Implementation of abstract function in child class
public boolean withdraw(double amount) {
if (balance() > minimumBalance && balance() - amount > minimumBalance) {
super.setBalance(balance() - amount);
return true;
} else {
return false;
}
}
}
Thank you!
7
4.43
(7 Votes)
0
4.5
4
abstract class Shape
{
public abstract int GetArea();
}
class Square : Shape
{
int side;
public Square(int n) => side = n;
// GetArea method is required to avoid a compile-time error.
public override int GetArea() => side * side;
static void Main()
{
var sq = new Square(12);
Console.WriteLine($"Area of the square = {sq.GetArea()}");
}
}
// Output: Area of the square = 144
Thank you!
4
4.5
(4 Votes)
0
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