Java interview questions

Java Frequently asked Interview Questions

Hai friends here we are giving some java interview question that is mostly asked in interviews

What is method overriding?

Method overriding occurs when sub class declares a method that has the same type arguments as a method declared by one of its superclass. The key benefit of overriding is the ability to define behavior that’s specific to a particular subclass type.

Note

The overriding method cannot have a more restrictive access modifier than the method being overridden (Ex: You can’t override a method marked public and make it protected).
You cannot override a method marked final
You cannot override a method marked static
Core java Click here

JDBC interview questions

What are the new features added to JDBC 4.0?

The major features added in JDBC 4.0 include :

Auto-loading of JDBC driver class
Connection management enhancements
Support for RowId SQL type
DataSet implementation of SQL using Annotations
SQL exception handling enhancements
SQL XML support
Jdbc click here

JSP interview questions

What is the life-cycle of JSP?

When a request is mapped to a JSP page for the first time, it translates the JSP page into a servlet class and compiles the class. It is this servlet that services the client requests.
A JSP page has seven phases in its lifecycle, as listed below in the sequence of occurrence

Translation
Compilation
Loading the class
Instantiating the class
jspInit() invocation
_jspService() invocation
jspDestroy() invocation

Hibernate interview questions

What are the ORM levels ?

The ORM levels are:

Pure relational (stored procedure.)
Light objects mapping (JDBC)
Medium object mapping
Full object Mapping (composition,inheritance, polymorphism, persistence by reachability)
Hibernate click here

Spring interview questions

What are the different types of IOC (dependency injection) ?

There are three types of dependency injection:

Constructor Injection (e.g. Pico container, Spring etc): Dependencies are provided as constructor parameters.
Setter Injection (e.g. Spring): Dependencies are assigned through JavaBeans properties (ex: setter methods).
Interface Injection (e.g. Avalon): Injection is done through an interface.

Note: Spring supports only Constructor and Setter Injection
Spring click here

Struts interview questions

.What is Struts framework?

Struts framework is an open-source framework for developing the web applications in Java EE, based on MVC-2 architecture. It uses and extends the Java Servlet API. Struts is robust architecture and can be used for the development of application of any size. Struts framework makes it much easier to design scalable, reliable Web applications with Java.
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