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J2SE Interview Questions and Answers
What is SGML ?
Standardized Generalized Markup Language. An ISO/ANSI/ECMA standard that
specifies a way to annotate text documents with information about types
of sections of a document.
What is SOAP ?
The Simple Object Access Protocol (SOAP) uses a combination of XML-based
data structuring and the Hyper Text Transfer Protocol (HTTP) to define a
standardized method for invoking methods in objects distributed in
diverse operating environments across the Internet.
What is SQL ?
Structured Query Language. The standardized relational database language
for defining database objects and manipulating data.
What is static ?
A Java keyword used to define a variable as a class variable. Classes
maintain one copy of class variables regardless of how many instances
exist of that class. static can also be used to define a method as a
class method. Class methods are invoked by the class instead of a
specific instance, and can only operate on class variables.
What is static field ?
Another name for class variable.
What is static method ?
Another name for class method.
What is stream ?
A stream is simply a byte-stream of data that is sent from a sender to a
receiver. There are two basic categories, so the java.io package
includes two abstract classes (InputStream and OutputStream).
What is subclass ?
A class that is derived from a particular class, perhaps with one or
more classes in between. See also superclass, supertype.
What is subtype ?
If type X extends or implements type Y, then X is a subtype of Y. See
also supertype.
What is superclass ?
A class from which a particular class is derived, perhaps with one or
more classes in between. See also subclass, subtype.
What is super ?
A Java keyword used to access members of a class inherited by the class
in which it appears.
What is supertype ?
The supertypes of a type are all the interfaces and classes that are
extended or implemented by that type. See also subtype, superclass.
What is switch ?
A Java keyword used to evaluate a variable that can later be matched
with a value specified by the case keyword in order to execute a group
of statements.
What is Swing ?
A collection of graphical user interface (GUI) components that runs
uniformly on any native platform which supports the Java virtual
machine*. Because they are written entirely in the Java programming
language, these components may provide functionality above and beyond
that provided by native-platform equivalents. (Contrast with AWT.)
What is synchronized ?
A keyword in the Java programming language that, when applied to a
method or code block, guarantees that at most one thread at a time
executes that code.
What is TCP/IP ?
Transmission Control Protocol based on IP. This is an Internet protocol
that provides for the reliable delivery of streams of data from one host
to another.
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