Abstract class having constructor, data member and methods

An abstract class can have a data member, abstract method, method body (non-abstract method), constructor, and even main() method.

File: TestAbstraction2.java

$\begin{lstlisting} //Example of an abstract class that has abstract and non-abst... ...ike obj = new Honda(); obj.run(); obj.changeGear(); } } \end{lstlisting}$

Output:

$\begin{lstlisting} bike is created running safely.. gear changed \end{lstlisting}$

Rule: If there is an abstract method in a class, that class must be abstract.

$\begin{lstlisting} class Bike12{ abstract void run(); } \end{lstlisting}$

Ouput

$\begin{lstlisting} compile time error \end{lstlisting}$