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J2SE Interview Questions and Answers


What is pixel ?
The picture element on a display area, such as a monitor screen or printed page. Each pixel is individually accessible.

What is POA ?
Portable Object Adapter. A CORBA standard for building server-side applications that are portable across heterogeneous ORBs.

What is primary key ?
An object that uniquely identifies an entity bean within a home

What is primitive type ?
A variable data type in which the variable's value is of the appropriate size and format for its type: a number, a character, or a Boolean value.

What is principal ?
The identity assigned to an entity as a result of authentication.

What is private ?
A Java keyword used in a method or variable declaration. It signifies that the method or variable can only be accessed by other elements of its class.

What is privilege ?
A security attribute that does not have the property of uniqueness and which may be shared by many principals. An example of a privilege is a group.

What is process ?
A virtual address space containing one or more threads.

What is property ?
Characteristics of an object that users can set, such as the color of a window.

What is profiles ?
A profile is a collection of Java APIs that complements one or more Java 2 Platform Editions by adding domain-specific capabilities. Profiles may also include other defined profiles. A profile implementation requires a Java 2 Platform Edition to create a complete development and deployment environment in a targeted vertical market. Each profile is subject to an associated set of compatibility requirements. Profiles may be usable on one or more editions.

Some examples of profiles within the Java 2 Platform, Micro Edition are:

* Personal Profile- for non-PC products that need to display Web-compatible Java-based content
* Java Card - for secure smart cards and other severely memory-constrained devices.

What is protected ?
A Java keyword used in a method or variable declaration. It signifies that the method or variable can only be accessed by elements residing in its class, subclasses, or classes in the same package.

What is public ?
A Java keyword used in a method or variable declaration. It signifies that the method or variable can be accessed by elements residing in other classes.

What is raster ?
A two-dimensional rectangular grid of pixels.

What is realm ?
See security policy domain. Also, a string, passed as part of an HTTP request during basic authentication, that defines a protection space. The protected resources on a server can be partitioned into a set of protection spaces, each with its own authentication scheme and/or authorization database

What is realm ?
A variable data type in which the variable's value is an address.

What is return ?
A Java keyword used to finish the execution of a method. It can be followed by a value required by the method definition.
 

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