What are abstract methods in java

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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Eridani 105 points

                                    An abstract method is the method which does&rsquo;nt have any body. 
Abstract method is declared with
keyword abstract and semicolon in place of method body.

  public abstract void &lt;method name&gt;();
Ex : public abstract void getDetails();
It is the responsibility of subclass to provide implementation to 
abstract method defined in abstract class

Thank you! 2

4 (2 Votes)

3.89

John Soennichsen 100 points

                                    No, abstract class can have zero abstract methods.

Thank you! 9

3.89 (9 Votes)

4.33

BDGapps 90 points

                                    // abstract class
abstract class Shape
{
   // abstract method
   abstract void sides();
}
class Triangle extends Shape
{
   void sides()
   {
      System.out.println(&quot;Triangle shape has three sides.&quot;);
   }
}
class Pentagon extends Shape
{
   void sides()
   {
      System.out.println(&quot;Pentagon shape has five sides.&quot;);
   }
   public static void main(String[] args)
   {
      Triangle obj1 = new Triangle();
      obj1.sides();
      Pentagon obj2 = new Pentagon();
      obj2.sides();
   }
}

Thank you! 6

4.33 (6 Votes)

3.5

Dhiraj 110 points

                                    public abstract class GraphicObject {

   abstract void draw();
}

Thank you! 2

3.5 (2 Votes)

Swizzlr 105 points

                                    abstract class scratch{
  
}

Thank you! 3

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