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Bca4020
1 Explain any
five features of Java.
Answer: Features of Java
Java defines data as objects with methods
that support the objects. Java is purely object-oriented and provides
2 Describe main
() method in Java. What are the rules for writing a main () method?
Answer: In a Java application, you
may have many classes. Within those classes, you may have many methods. The
method that you need to execute first should be the main() method.
Syntax for the
main()
3 Differentiate
between packages and Interfaces.
Answer: To create a package is quite easy: simply include a
package command as the first statement in a Java source file. Any classes
declared within that file will belong to the specified package. The package
statement defines a name space in which classes are stored. If you omit the
package statement, the class names are put into the default package, which has
no name. (This is why
4 How we can
search the first and last occurrence of a substring?
Answer: The String class provides
two methods that allow you to search a string for a specified character or
substring:
• indexOf( ) Searches for the first
occurrence of a character or substring.
• lastIndexOf( ) Searches
5 Compare JDBC
and ODBC.
Answer: JAVA Data Base Connectivity (JDBC)
The JDBC API (Java Data Base Connectivity
Application Program Interface) can access any kind of tabular data, especially
data
6 Describe
about:
a) Swing
b) JFC
Answer: a) Swing is the
next-generation GUI toolkit that Sun Microsystems created to enable enterprise
development in Java. By enterprise development, we mean that programmers can
use Swing to create large-
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