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J2SE Interview Questions and Answers
What is default ?
A Java keyword optionally used after all case conditions in a switch
statement. If all case conditions are not matched by the value of the
switch variable, the default keyword will be executed.
What is definition ?
A declaration that reserves storage (for data) or provides
implementation (for methods). See also declaration.
What is delegation ?
An act whereby one principal authorizes another principal to use its
identity or privileges with some restrictions.
What is deprecation ?
Refers to a class, interface, constructor, method or field that is no
longer recommended, and may cease to exist in a future version.
What is derived from ?
Class X is "derived from" class Y if class X extends class Y. See also
subclass, superclass.
What is distributed ?
Running in more than one address space.
What is distributed application ?
An application made up of distinct components running in separate
runtime environments, usually on different platforms connected through a
network. Typical distributed applications are two-tier (client/server),
three-tier (client/middleware/server), and n-tier (client/multiple
middleware/multiple servers).
What is do ?
A Java keyword used to declare a loop that will iterate a block of
statements. The loop's exit condition can be specified with the while
keyword.
What is DOM ?
Document Object Model. A tree of objects with interfaces for traversing
the tree and writing an XML version of it, as defined by the W3C
specification.
What is double ?
A Java keyword used to define a variable of type double.
What is double precision ?
In the Java programming language specification, describes a floating
point number that holds 64 bits of data. See also single precision.
What is DTD ?
Document Type Definition. A description of the structure and properties
of a class of XML files.
What is else ?
A Java keyword used to execute a block of statements in the case that
the test condition with the if keyword evaluates to false.
What is Embedded Java Technology ?
The availability of Java 2 Platform, Micro Edition technology under a
restrictive license agreement that allows a licensee to leverage certain
Java technologies to create and deploy a closed-box application that
exposes no APIs.
What is encapsulation ?
The localization of knowledge within a module. Because objects
encapsulate data and implementation, the user of an object can view the
object as a black box that provides services. Instance variables and
methods can be added, deleted, or changed, but as long as the services
provided by the object remain the same, code that uses the object can
continue to use it without being rewritten. See also instance variable,
instance method.
What is enum ?
A Java keyword used to declare an enumerated type.
What is enumerated type ?
A type whose legal values consist of a fixed set of constants.
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