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Java interview questions and answers for freshers Page 11

(#M40029407) JAVA QUESTION java Keep an EYE

Q. What are Encapsulation, Inheritance and Polymorphism?

A. Encapsulation is the mechanism that binds together code and data it manipulates and keeps both safe from outside interference and misuse. Inheritance is the process by which one object acquires the properties of another object. Polymorphism is the feature that allows one interface to be used for general class actions.

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(#M40029406) JAVA QUESTION java Keep an EYE

Q. Why there are no global variables in Java?

A. Global variables are globally accessible. Java does not support globally accessible variables due to following reasons:
1)The global variables breaks the referential transparency
2)Global variables creates collisions in namespace

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(#M40029405) JAVA QUESTION java Keep an EYE

Q. What is the Java API?

A. The Java API is a large collection of ready-made software components that provide many useful capabilities, such as graphical user interface (GUI) widgets

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(#M40029404) JAVA QUESTION java Keep an EYE

Q. What is stored procedure?

A. Stored procedure is a group of SQL statements that forms a logical unit and performs a particular
task. Stored Procedures are used to encapsulate a set of operations or queries to execute on
database. Stored procedures can be compiled and executed with different parameters and results
and may have any combination of input/output parameters

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(#M40029403) JAVA QUESTION java Keep an EYE

What are drivers available?

a) JDBC-ODBC Bridge driver
b) Native API Partly-Java driver
c) JDBC-Net Pure Java driver
d) Native-Protocol Pure Java driver

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(#M40029402) JAVA QUESTION java Keep an EYE

Q. What is JDBC?

A. JDBC is a set of Java API for executing SQL statements. This API consists of a set of classes and interfaces to enable programs to write pure Java Database applications.

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(#M40029401) JAVA QUESTION java Keep an EYE

Q. How do you set security in applets?

A. using setSecurityManager() method

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(#M40029400) JAVA QUESTION java Keep an EYE

Q. What is the lifecycle of an applet?

A.
init() method - Can be called when an applet is first loaded
start() method - Can be called each time an applet is started.
paint() method - Can be called when the applet is minimized or maximized.
stop() method - Can be used when the browser moves off the applet’s page.
destroy() method - Can be called when the browser is finished with the applet.

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(#M40029399) JAVA QUESTION java Keep an EYE

Q. What is an applet?

A. Applet is a dynamic and interactive program that runs inside a web page displayed by a java capable browser

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(#M40029398) JAVA QUESTION java Keep an EYE

Q. What is deadlock?

A. When two threads are waiting each other and can't precede the program is said to be deadlock.

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