Java Interview Questions: – Can you explain the main components of JDBC?

This is the most practical oriented Java Interview Questions which may be asked during the Interview by the Interviewer.

Driver Manager:

• Manages a list of database drivers.
• Matches connection requests from the java application with the proper database driver using communication
  

Driver:

• The database communications link, handling all communication with the database.
• Normally, once the driver is loaded, the developer need not call it explicitly.

Connection

• Interface with all methods for contacting a database
• Represents communication context, i.e., all communication with database is through connection object only.

Statement

• Encapsulates an SQL statement which is passed to the database to be parsed, compiled, planned and executed.

Result Set

• The ResultSet represents set of rows retrieved due to query execution

Data source

• is a facility for storing data
• Data Source may point to RDBMS, file system, any DBMS

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Java Interview Questions: – Elaborate configuration of JSF application in web.xml?

URL containing faces is mapped to FacesServlet which will perform the required task when invoked.

Following are the important entries

Additional entities are made as context param

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JAVA INTERVIEW QUESTIONS: - 20 BASICS INTERVIEW QUESTIONS ON JAVA? Part: -2.

• What is a native method?
• Does Java provide any construct to find out the size of an object?
• Is Empty .java file a valid source file?
• Can a .java file contain more than one java classes?
• What is the difference between an argument and a parameter?
• What is UNICODE?
• What are Transient and Volatile Modifiers?
• What are the different scopes for Java variables?
• What are wrapper classes?
• What is a the difference between System.err and System.out?
• What are the contracts defined by .equals()?
• If two objects are considered equal by .equals() , can it be said they has same hashCode()?
• If two objects have same hashCode() is it necessary they will be equal by using .equals() method?
• What contracts hashCode () defines?
• What is the difference between == and equals?
• What is the difference between List and List (not parameterized list and list parameterized by String) in Java?
• What are generics in jdk1.5?
• Are generics covariant?
• What are Lower-bounded wildcards in generics?
• What is Upper bounded wildcards in generics?

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