What is an interface? How is it useful?

What is an interface? How is it useful?
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A: Interface is like a class that contains declaration of methods and variables without the function definition. It helps in implementing multiple inheritance.
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Data input is A) an abstract class defined in java.io B) a class we can use to read primitive data types C) an interface that defines methods to open files. D) an interface that defines methods to read primitive data types.

Description : Data input is A) an abstract class defined in java.io B) a class we can use to read primitive data types C) an interface that defines methods to open files. D) an interface that defines methods to read primitive data types.

Last Answer : D) an interface that defines methods to read primitive data types.

Data input is A) an abstract class defined in java.io B) a class we can use to read primitive data types C) an interface that defines methods to open files. D) an interface that defines methods to read primitive data types.

Description : Data input is A) an abstract class defined in java.io B) a class we can use to read primitive data types C) an interface that defines methods to open files. D) an interface that defines methods to read primitive data types.

Last Answer : D) an interface that defines methods to read primitive data types.

State true or false for Java Program. i) Data members of an interface are by default final ii) An abstract class has implementations of all methods defined inside it. A) i-false, ii-false B) i-false, ii-true C) i-true, ii-false D) i-true, ii-true

Description : State true or false for Java Program. i) Data members of an interface are by default final ii) An abstract class has implementations of all methods defined inside it. A) i-false, ii-false B) i-false, ii-true C) i-true, ii-false D) i-true, ii-true

Last Answer : C) i-true, ii-false

When a program class implements an interface, it must provide behavior for A) two methods defined in that interface B) any methods in a class C) only certain methods in that interface D) all methods defined in that interface

Description : When a program class implements an interface, it must provide behavior for A) two methods defined in that interface B) any methods in a class C) only certain methods in that interface D) all methods defined in that interface

Last Answer : D) all methods defined in that interface

Which of the following are the functions of operating system? i) recovering from errors ii) facilitating input/output iii) facilitating parallel operation iv) sharing hardware among users v) implementing user interface A) i, ii, ii, and v only B) i, ii, iii, and iv only C) ii, iii, iv and v only D) All i, ii, iii, iv and v

Description : Which of the following are the functions of operating system? i) recovering from errors ii) facilitating input/output iii) facilitating parallel operation iv) sharing hardware among users v) implementing user interface A) i, ii, ... only C) ii, iii, iv and v only D) All i, ii, iii, iv and v

Last Answer : D) All i, ii, iii, iv and v

……………. Allows definitions and query language statements to be entered; query results are formatted and displayed. A) Schema Processor B) Query Processor C) Terminal Interface D) None of the above

Description : ……………. Allows definitions and query language statements to be entered; query results are formatted and displayed. A) Schema Processor B) Query Processor C) Terminal Interface D) None of the above

Last Answer : C) Terminal Interface

Which layers of the OSI determines the interface often system with the user? A) Network B) Application C) Data link D) Session

Description : Which layers of the OSI determines the interface often system with the user? A) Network B) Application C) Data link D) Session

Last Answer : B) Application

FDDI stands for A) Fiber Distributed Data Interface B) Fiber Data Distributed Interface C) Fiber Dual Distributed Interface D) Fiber Distributed Data Interface

Description : FDDI stands for A) Fiber Distributed Data Interface B) Fiber Data Distributed Interface C) Fiber Dual Distributed Interface D) Fiber Distributed Data Interface

Last Answer : A) Fiber Distributed Data Interface

The following three golden rules: (i) Place the user in control (ii) Reduce the user’s memory load (iii) Make the interface consistent are for (A) User satisfaction (B) Good interface design (C) Saving system’s resources (D) None of these

Description : The following three golden rules: (i) Place the user in control (ii) Reduce the user’s memory load (iii) Make the interface consistent are for (A) User satisfaction (B) Good interface design (C) Saving system’s resources (D) None of these

Last Answer : (B) Good interface design 

A part of Windows 2000 operating system that is not portable is (A) Device Management (B) Virtual Memory Management (C) Processor Management (D) User Interface

Description : A part of Windows 2000 operating system that is not portable is (A) Device Management (B) Virtual Memory Management (C) Processor Management (D) User Interface

Last Answer : (B) Virtual Memory Management

The Servlet Response interface enables a servlet to formulate a response for a client using the method ............... (A) void log(Exception e, String s) (B) void destroy() (C) int getServerPort() (D) void setContextType(String Type)

Description : The Servlet Response interface enables a servlet to formulate a response for a client using the method ............... (A) void log(Exception e, String s) (B) void destroy() (C) int getServerPort() (D) void setContextType(String Type)

Last Answer : (D) void setContextType(String Type)

In Java, when we implement an interface method, it must be declared as: (A) Private (B) Protected (C) Public (D) Friend

Description : In Java, when we implement an interface method, it must be declared as: (A) Private (B) Protected (C) Public (D) Friend

Last Answer : (C) Public

Which of the following is not valid with reference to Message Passing Interface (MPI)? (A) MPI can run on any hardware platform (B) The programming model is a distributed memory model. (C) All parallelism is implicit. (D) MPI - Comm - Size returns the total number of MPI processes in specified communication.

Description : Which of the following is not valid with reference to Message Passing Interface (MPI)? (A) MPI can run on any hardware platform (B) The programming model is a distributed memory model. (C) All ... implicit. (D) MPI - Comm - Size returns the total number of MPI processes in specified communication.

Last Answer : (C) All parallelism is implicit.

Which of the following is/are correct with reference to Abstract class and interface ? (a) A class can inherit only one Abstract class but may inherit several interfaces. (b) An Abstract class can provide complete and default code but an interface has no code. Codes : (A) (a) is true (B) (b) is true (C) Both (a) and (b) are true (D) Neither (a) nor (b) is true

Description : Which of the following is/are correct with reference to Abstract class and interface ? (a) A class can inherit only one Abstract class but may inherit several interfaces. (b) An Abstract class can provide complete and default ... true (C) Both (a) and (b) are true (D) Neither (a) nor (b) is true

Last Answer : Answer: C

State whether true or false. i) Multithreading is useful for application that perform a number of essentially independent tasks that do not be serialized. ii) An example of multithreading is a database server that listens for and process numerous client request. A) i-True, ii-False B) i-True, ii-True C) i-False, ii-True D) i-False, ii-False

Description : State whether true or false. i) Multithreading is useful for application that perform a number of essentially independent tasks that do not be serialized. ii) An example of multithreading is a database server that listens for ... B) i-True, ii-True C) i-False, ii-True D) i-False, ii-False

Last Answer : B) i-True, ii-True

………… is very useful in situation when data have to stored and then retrieved in reverse order. A) Stack B) Queue C) List D) Link list

Description : ………… is very useful in situation when data have to stored and then retrieved in reverse order. A) Stack B) Queue C) List D) Link list

Last Answer : A) Stack

Processed data is called ……………….. A) Raw data B) Information C) Useful data D) Source

Description : Processed data is called ……………….. A) Raw data B) Information C) Useful data D) Source

Last Answer : B) Information

Serial access memories are useful in applications where (A) Data consists of numbers (B) Short access time is required. (C) Each stored word is processed differently. (D) None of these

Description : Serial access memories are useful in applications where (A) Data consists of numbers (B) Short access time is required. (C) Each stored word is processed differently. (D) None of these

Last Answer : (D) None of these Explanation: data naturally needs to flow in and out in serial form.

The Prototyping model of software development is: (1) a reasonable approach when requirements are well-defined. (2) a useful approach when a customer cannot define requirements clearly. (3) the best approach to use for projects with large development teams. (4) a risky model that rarely produces a meaningful product.

Description : The Prototyping model of software development is: (1) a reasonable approach when requirements are well-defined. (2) a useful approach when a customer cannot define requirements clearly. (3) the ... projects with large development teams. (4) a risky model that rarely produces a meaningful product.

Last Answer : 1

Where is the shortcut area in the window xp interface how is it useful for us?

Description : Where is the shortcut area in the window xp interface how is it useful for us?

Last Answer : What is the answer ?

A ____ is a namespace for organizing classes and interfaces in a logical manner. Placing your code into ______makes large software projects easier to manage. This section explains why this is useful and introduces you to the Application Programming Interface (API) provided by the Java Platform: a) Inheritance b) Object c) Package d) None of These

Description : A ____ is a namespace for organizing classes and interfaces in a logical manner. Placing your code into ______makes large software projects easier to manage. This section explains why this is useful and ... provided by the Java Platform: a) Inheritance b) Object c) Package d) None of These

Last Answer : c) Package