Chapter IV XI IP Notes

PROGRAMMING FUNDAMENTALS

11.What is java character set

-          Java character set is a valid set of character used in java programming

-          Java supports Unicode

22  What are Tokens

-          The smallest individual unit in a program is known as a Token

33  How many types of tokens are there in Java

-          There are Five Types of Tokens in Java

-          Identifiers

-          Literals

-          Punctuators

-          Operators

-          Keywords

44  What are Identifiers

-          Identifiers are the names given to the variables , objects etc in the program

-          Naming convention or rules to name Identifiers

o   They cannot be keywords

o   They cannot begin from any numbers or symbols except _ $

o   They cannot have any special symbols in between or in front of their name

MyFile is OK

My File is wrong

_in is OK

1in is wrong

In1is OK

A_to_z is OK

55    What are Literals

-          Literals are data items that are fixed data values. Java allows several Kind of Literals.

-          Integer – Literals

-          Character –literals

-          Floating –literals

-          Boolean-literals

-          String-literals

-          The null literals

66    What is integer Literal

-          Integer Literal are whole numbers without any fractional part. E.g. 11,100,34,32

-          Java supports three types of integer Literals

o   Decimal (base 10)

o   Octel (base 8)

o   Hexadecimal (base 16)

77  What is Floating Literals

-          Floating Literals are literals with fractional parts. E.g. 11.00, 100.01,34.00,32.01

-          Floating literals are also called as real literals.

78     What is a Boolean literal

-          A Boolean literal is a literal with true or false value. T or F

99     What is a string literal

-Literal with group of character is called string literal e.g. “AMIT”,”JAICHAND”,”VISHAL”,”OM”

-string literal is a class datatype.  

110.   What is a character Literal

-          A character literal is one character enclosed in single quote eg. ‘A’,’J’,’V’,’O’

-          Escape sequence are also character literal

111.   What is escape sequence

-          Those are special character what represent special meaning. More are none printable characters.

-          The escape sequence begins with \ eg. \b ,\n ,\a ,\t

112.   What is NULL Literal sequence

-          The NULL type has one value, the null reference

113.   What is a Separator

-Java supports Nine Separators.

- { } [ ] ( ) , ; .

114.   What is a java Operator .

-          Operator is a symbol that works between two operands and give result to a operator.

115.   How many operators are there in java

-          There are 37 different operators in java

116.   What is Reference Datatype