Interview Question

[bunny]

What is the difference between NoClassDefFoundException and ClassNotFoundException? When do we get these Exceptions?

[Prajin]

NoClassDefFoundException - The Java runtime can't find the class file, that's because classpath isn't set properly.

ClassNotFoundException -Thrown when an application tries to load a class through its string name using Class.forName, ClassLoader. findSystemClass or ClassLoader. loadClass

- for more start googling
-Regards

[Ramanjaneyulu]

Hi Bunny,

Both are almost same Exceptions.The difference is

If you use
Car c=new Car(); statement in your program,then this class will statically(compiletime) load.In this case,if the runtime system cannot find the referenced class then "NoClassDefFoundException" will be thrown.

If you use
Class.forName ("Car"); statement in your program,then this class will dynamically(runtime) load.In this case,if the runtime system cannot find the referenced class then "ClassNotFoundException" will be thrown.

[bunny]

Thank you Ram,With clear explanation I got the point.