Question { IBM, 23566 }

what exactly happens when we execute
"Class.forname("Driver class name");"?Explain indetail

Answer

By the end of the execution of Class.forName("Driver
class"); the driver class should be loaded into the memory
but also
1. The driver class should be initialized
2. Should be registered with the driver manager class
The above two operations are not done by forName() . So a
pure Static() block is defined in which the above two tasks
are manipulated and by which we are able to get connection,
immediately after loading the driver class without writing
any code to initialize the driver class.

Question { TCS, 15492 }

When does the compiler supply a default constructor for a
class?

Answer

When we donot override the default constructor in a class,
which is extended implicitly by our class from java.lang
package, compiler supplies it.

Question { Ordain Solutions, 9985 }

How does serialization work

Answer

Serialization is a marker interface to tell the jvm that
the class extending Serializable interface wants to persist
or write its state over the output stream. All the
variables other than transient type can only be persisted.