Is there any way to check whether an object is serializable or not in java?

Use

if(someObj instanceof Serializable) // recommended because it uses 
                                    // the byte code instruction INSTANCEOF

or

if(Serializable.class.isInstance(someObj))

Using Class.isInstance(someObj) makes sense if the Class should be replaceable at runtime.

For example:

Class<?> someClass == ....; // assign a class object reference dynamically
if(someClass.isInstance(someObj))