Prog Keywords,Literals, Data Types And Variable Statements

Question 1

Case Sensitive
Every line of code must be inside a class

Answer 1

Java Program

Question 2

Specifies one or more actions to be performed during the execution of program

Answer 2

Java Statement

Question 3

A block is formed when?

Answer 3

Enclosing statement by curly braces

Question 4

Used to add notes and it is ignored by the compiler

Answer 4

Comments

Question 5

Comment //

Answer 5

Single line

Question 6

Comment /**/

Answer 6

Block

Question 7

Comment /** **/

Answer 7

JavaDoc

Question 8

Words that are used to to properly identify name a class, procedure, methods, or variables.

Answer 8

Java Identifiers

Question 9

Case sensitive
Cannot start with a number
Can use (Aa-Zz) (0-9) (_,$)
Keywords are not allowed

Answer 9

Java Identifiers Rules

Question 10

Items in a program whose value do not change

Answer 10

Java Literals

Question 11

Used to represent specific integer values
Can be expressed in
Octal 8
Decimal 10
Hexadecimal 16

Answer 11

Integer Literals

Question 12

F is always required

Answer 12

Floating Point Literals

Question 13

True or False

Answer 13

Boolean Literals

Question 14

Zero or More characters enclosed in double quotation marks

Answer 14

String Literals

Question 15

Enclosed in single quotation marks

Answer 15

Character Literals

Question 16

Boolean, char, byte, short, int, long, float, double

Answer 16

Primitive Data Type

Question 17

Classes, Interfaces, Arrays

Answer 17

Non Primitive

Question 18

One bit wide and its initial value is false

Answer 18

Boolean Data Type

Question 19

Represents 16bit unicode character
Enclosed in single quotation mark

Answer 19

Char Data Type

Question 20

Can store whole numbers from -2147483648 to 2147483648
Preferred data type

Answer 20

Integer Data Type

Question 21

Can hold decimals such as 9.99 or 3.14515
Must end with an F

Answer 21

Floating Point Data Type

Question 22

Store a sequence of characters must be surrounded by double quotation marks

Answer 22

String Data Type

Question 23

Containers for storing data values

Answer 23

Java Variables

Question 24

Collection of framework, collection classes, classes related tondate and time, internatiolization, and miscellaneuos utility classes

Answer 24

import java.util.*;

Question 25

A scanner used to get user input

Answer 25

import java util.Scanner*;

Question 26

Contains nearly everyclass you might ever need to perform input output in Java

Answer 26

import java.io.*;