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Question 1

What is Java

Answer 1

Java is a computer language that enables the users to communicate with the computer

Question 2

Name the different character sets

Answer 2

-Letters

-Digits

-Operators

Question 3

Name the types of operators and give one example of each

Answer 3

• Arithmetical operator: +, - , *

-Logical operators:&& , || , !

• Relational operators: < , <= , > , >= , ==

-Delimiters: ? , . , -

Question 4

What is Unicode

Answer 4

Unicode is a standard encoding system created by Unicode consortium that is used to encode a character in any computer language

Question 5

What are the advantages of Unicode

Answer 5

• It is a universal coding scheme followed throughout the world.
• It is a more efficient coding system than the ISO or IEC.
• It supports uniform coding width for all the characters.

-A particular code of a character is always unique

Question 6

What is ASCII and what does it stand for

Answer 6

ASCII stands for American standard code for information interchange.
The ASCII codes are decimal numbers represented in 7 binary digits.

Question 7

What are escape sequences? In which program are they frequently used in?

Answer 7

Non-graphic characters which are used as commands to direct the cursor while printing are known as escape sequences. They are frequently used in Java programming.

Question 8

Explain the escape sequences:

\n

\t

"

\

'

Answer 8

• as soon as this is encountered, the cursor moves to the next line on the screen for printing.
• this is used to provide a gap (of 8 spaces) between the values while printing.
• it is used when you want to display a message on the screen in such a way that a part needs to appear under double quotes
• it is used to insert a backslash at the point of its appearance in the message or output
• this is used to insert a single quote at the point of appearance in the output message

Question 9

What is a token?

Answer 9

A token is a functional and fundamental unit of a computer program. Each individual component of a programming statement is referred to as a token

Question 10

What are literals?

Answer 10

Literals are the constants of a Java program

Question 11

Name the types of literals

Answer 11

Integer literals

Real literals

Character literals

String literals

Boolean literals

Null literals

Question 12

Define identifiers

Answer 12

It is a term used to represent program elements such as function name or class name

Question 13

What is an assignment

Answer 13

Assignments is the process of storing constants in a variable using a token ‘=’ symbol.

Question 14

How does initialisation of a variable take place? Explain.

Answer 14

• Static initialisation - it uses direct assignment of a constant to a defined variable
• Dynamic initialisation - when a variable gets initialised during the execution of program logic.

Question 15

What are punctuators

Answer 15

Punctuators are the punctuation signs used as special characters in Java.

Question 16

Define separators and state their significance.

Answer 16

They are special characters in Java, which are used to separate the variables or the characters.

Question 17

What are operators

Answer 17

They are the tokens that perform Arithmetical or logical operations.

Question 18

What are keywords

Answer 18

They are the reserved words which are preserved by the system and carry special meaning for the system compiler.

Question 19

What are the types of data types? Explain.

Answer 19

• Primitive data types- those which are independent of any other types.
  Classified as:
  Numeric and non-numeric
• Non-primitive-
  (No definition)
  Classified as:
  Classes, arrays, interface

Question 20

Give classification of integer type

Answer 20

Byte, int, short, long

Question 21

Give classification of floating type

Answer 21

Float, double

Question 22

The character type contains only a single _____________

Answer 22

Character

Question 23

Name some well known characters and their ASCII codes

Answer 23

A-Z = 65-90

a-z = 97-122

0-9 = 48-57

Question 24

A character must always be enclosed within __________

Answer 24

Single quotes

Question 25

String must always be enclosed within __________

Answer 25

Double quotes

Question 26

What is an Arithmetical expression? Explain it’s types

Answer 26

A set of variables, constants and Arithmetical operators used to yield a meaningful result.

Types:

Pure expressions - uses all it’s components of same data types

Impure expression - uses one or more components are if different data types.

Question 27

In impure expressions, the data type of the result gets automatically converted into the highest data type available in the expression without any intervention of the user. This system types is known as ___________

Answer 27

Implicit type conversion

Question 28

Define explicit type conversion

Answer 28

It is when the data type gets converted to another data type after the users intervention the type conversion