Tuesday, 15 August 2017

Java Operators

Java provides a rich set of operators enviroment. Java operators can be devided into following categories
·        

  •       Arithmetic operators
  • ·        Relation operators
  • ·        Logical operators
  • ·        Bitwise operators
  • ·        Assignment operators
  • ·        Conditional operators
  • ·        Misc operators


Arithmetic operators
Arithmetic operators are used in mathematical like addition, subtraction etc.Arithmetic operators are used in mathematical expression in the same way that are used in algebra.

Operator
Description
+
adds two operands
-
subtract second operands from first
*
multiply two operand
/
divide numerator by denumerator
%
remainder of division
++
Increment operator increases integer value by one
--
Decrement operator decreases integer value by one


Relation operators

These operators always return the boolean value either true or false when used in an ex pression. In java we have six different relational operators:.

Operator
Description
==
Check if two operand are equal
!=
Check if two operand are not equal.
> 
Check if operand on the left is greater than operand on the right
< 
Check operand on the left is smaller than right operand
>=
check left operand is greater than or equal to right operand
<=
Check if operand on left is smaller than or equal to right operand


Logical operators

Logical operators return a true or false value based on the state of the Variables.
Java supports following 3 logical operator. Suppose a=1 and b=0;

Operator
Description
Example
&&
Logical AND
(a && b) is false
||
Logical OR
(a || b) is true
!
Logical NOT
(!a) is false


Bitwise operators.

Java defines several bitwise operators that can be applied to the integer types long, int, short, char and byte.

Operator
Description
&
Bitwise AND
|
Bitwise OR
^
Bitwise exclusive OR
<< 
left shift
>> 
right shift

Now lets see truth table for bitwise &, | and ^

A
b
a & b
a | b
a ^ b
0
0
0
0
0
0
1
0
1
1
1
0
0
1
1
1
1
1
1
0

The bitwise shift operators shifts the bit value. The left operand specifies the value to be shifted and the right operand specifies the number of positions that the bits in the value are to be shifted. Both operands have the same precedence.

Example
a = 0001000
b= 2
a << b= 0100000
a >> b= 0000010


Assignment Operators

Assignment Operator is denoted by the symbol “=” and it is the most commonly used operator. It simply assigns the value on the right to the variable on the left. Syntax of the assignment operator is <variable> = <expression>.

Operator
Description
Example
=
assigns values from right side operands to left side operand
a=b
+=
adds right operand to the left operand and assign the result to left
a+=b is same as a=a+b
-=
subtracts right operand from the left operand and assign the result to left operand
a-=b is same as a=a-b
*=
mutiply left operand with the right operand and assign the result to left operand
a*=b is same as a=a*b
/=
divides left operand with the right operand and assign the result to left operand
a/=b is same as a=a/b
%=
calculate modulus using two operands and assign the result to left operand
a%=b is same as a=a%b


Misc operator
There is few other operator supported by java language.

Conditional operator
It is also known as ternary operator and used to evaluate Boolean expression

Example:
epr1 ? expr2 : expr3
If epr1 Condition is true? Then value expr2 : Otherwise value expr3

instance Of operator
This operator is used for object reference variables. The operator checks whether the object is of particular type (class type or interface type)

In this post we learned about operators in java like  Arithmetic operators,Relation operators,Logical operators,Bitwise operators,Assignment operators,Conditional operators,Misc operators


In next post we will learn about loop control in java.

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