Java provides a rich set of operators environment. Java operators can be divided into following categories:
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 
The following table shows all relation operators supported by Java.
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 
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 
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 operator supported by Java are as follows:
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=ab 
*=  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 
There are few other operator supported by java language.
It is also known as ternary operator and used to evaluate Boolean expression,
epr1 ? expr2 : expr3
If epr1
Condition is true? Then value expr2
: Otherwise value expr3
instanceOf
operatorThis operator is used for object reference variables. The operator checks whether the object is of particular type (class type or interface type)