ConcretePage.comWhat is abstract class in java? How may I use it?
Asked on March 21, 2015
What is abstract class in java? How may I use it?
Replied on April 12, 2015
1- A class that is declared as abstract is known as abstract class. It needs to be extended and its method implemented. It cannot be instantiated.
2- Abstract classes can have constructors which will be implicitly called when a child class is instantiated (if it is non-parameterised). But this is not possible with interfaces.
abstract class Animal{
public int noOfLegs;
public boolean isAlive;
Animal(){
isAlive = true;
}
public abstract void walk();
}
class Cow extends Animal{
Cow(){
noOfLegs = 4;
}
public void walk(){
if(isAlive){
//Code for walking
}
}
}
