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No, abstract class can have zero abstract methods.
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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.
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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
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No. A normal class(non-abstract class) cannot have abstract methods.
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public abstract class Multi{
public abstract void multi();//Abstract method declaration
Public void subtract(){
}
}
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An abstract class is a common class that has attributes and methods.
and it has at least one abstract method, it can also contain normal methods.
This class cannot be instantiated, it can only be inherited,
that is, it cannot be used to create an object.
Una clase abstracta es una clase común que posee atributos y métodos,
y tiene como mínimo un método abstracto, además puede contener métodos normales.
Esta clase no puede ser instanciada, solo puede heredarse,
o sea no se puede usar para crear un objeto.
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abstract class AbstractDemo { // Abstract class
private int i = 0;
public void display() { // non-abstract method
System.out.print("Welcome to Tutorials Point");
}
}
public class InheritedClassDemo extends AbstractDemo {
public static void main(String args[]) {
AbstractDemo demo = new InheritedClassDemo();
demo.display();
}
}
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abstract class Language {
// method of abstract class
public void display() {
System.out.println("This is Java Programming");
}
}
class Main extends Language {
public static void main(String[] args) {
// create an object of Main
Main obj = new Main();
// access method of abstract class
// using object of Main class
obj.display();
}
}
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Yes, we can. An abstract class can have both abstract and non-abstract methods