difference between open closed principle and inheritance

Question

I know that open closed principle mean open for extension and closed for modification. Consider an example as follows

public class Vehicle{
    public void service(){
        //vehicle servicing code
    }
}

public class Bike extends Vehicle{

    public void service(){
        // bike specific servicing 
    }
}

Now I understand that Bike class has extended Vehicle and adds new functionality using Open Closed Principle.

Consider I create jar file of Vehicle class and then Bike class extends Vehicle class from jar. In this case, we can't modify Vehicle class and Bike extends it. Is it a good example of open closed principle? I would like to know how OCP is different from inheritance

Answer 1

OCP is not different from Inheritance, rather the "Open" part of the OCP is open for extension, but should be closed for modification. I.e. the code should only modified for errors/bugs but for new extension or change to the functionality it should be extended.

As a Side note I believe this would be better put in the programmers.stackexchange.com site.