Q) What are the default values given by JVM for primitive class scoped variables (non-local variables)?

->For all numerical types JVM gives “zero” as default value.

-> For all Boolean types it is “false” is given by JVM.

->For all char type JVM gives “null character” (\u000). null is different & null character is different.

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Q) What is JDBC driver? What is its role in java database connection?

A) ->A translation software written in java according o JDBC specification is nothing but “JDBC driver”. -> JDBC driver implements JDBC API. Use single API. JDBC driver role: They are 4 roles 1) Establishing connection between JDBC client and database server. 2) Receiving JDBC method calls made by JDBC client while performing database (CRUD) operations. 3) Translating java method calls into DBMS understandable calls and forwarding them to database server. 4) Receiving the results from database server. Translating them into java format and handling over the same to the JDBC client.

Q) What is ODBC?

A) ->open database connectivity is a technology from MS that enables any language program (other than java) to communication with database Management System. ->in java program ODBC is directly not allowed for the fallowing reasons 1) OS dependency 2) Procedural oriented approach 3) Security thread

Q) Explain about nested classes?

A) ->defining a class with in another class is known as nesting of the class. Ex: class A { class B { } //nested class, and inner class.because it is not static class. } //enclosing class or outer class. ->static class is declared in inside an another class then it does not become an inner class. Note: non-static nested class is known as “inner class”. In the above example class B is nested but not an inner class. Ex: class D { static c { } //nested class, but not an inner class , because of static class. } //outer class. ->we have three different kinds of inner classes. 1) Member inner class 2) Meth...

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