



Bitwise operators in Java


Bitwise operators are used to perform manipulation of individual bits of a number. They can be used with any of the integral types (char, short, int, etc). They are used when performing update and query operations of Binary indexed tree. 

Bitwise OR (|) –
This operator is binary operator, denoted by ‘|’. It returns bit by bit OR of input values, i.e, if either of the bits is 1, it gives 1, else it gives 0.
For example,
a = 5 = 0101 (In Binary)

b = 7 = 0111 (In Binary)



Bitwise OR Operation of 5 and 7

  0101

| 0111

 ________

  0111  = 7 (In decimal) 

Bitwise AND (&) –
This operator is binary operator, denoted by ‘&’. It returns bit by bit AND of input values, i.e, if both bits are 1, it gives 1, else it gives 0.
For example,
a = 5 = 0101 (In Binary)

b = 7 = 0111 (In Binary)



Bitwise AND Operation of 5 and 7

  0101

& 0111

 ________

  0101  = 5 (In decimal) 

Bitwise XOR (^) –
This operator is binary operator, denoted by ‘^’. It returns bit by bit XOR of input values, i.e, if corresponding bits are different, it gives 1, else it gives 0.
For example,
a = 5 = 0101 (In Binary)

b = 7 = 0111 (In Binary)



Bitwise XOR Operation of 5 and 7

  0101

^ 0111

 ________

  0010  = 2 (In decimal) 

Bitwise Complement (~) –
This operator is unary operator, denoted by ‘~’. It returns the one’s compliment representation of the input value, i.e, with all bits inversed, means it makes every 0 to 1, and every 1 to 0.
For example,
a = 5 = 0101 (In Binary)



Bitwise Compliment Operation of 5



~ 0101

 ________

  1010  = 10 (In decimal) 
Note – Compiler will give 2’s complement of that number, i.e., 2’s compliment of 10 will be -6.









 


 

 













// Java program to illustrate 
// bitwise operators 
public class operators { 
    public static void main(String[] args) 
    { 
        //Initial values 
        int a = 5; 
        int b = 7; 
  
        // bitwise and 
        // 0101 & 0111=0101 = 5 
        System.out.println("a&b = " + (a & b)); 
  
        // bitwise or 
        // 0101 | 0111=0111 = 7 
        System.out.println("a|b = " + (a | b)); 
  
        // bitwise xor 
        // 0101 ^ 0111=0010 = 2 
        System.out.println("a^b = " + (a ^ b)); 
  
        // bitwise and 
        // ~0101=1010 
        // will give 2's complement of 1010 = -6 
        System.out.println("~a = " + ~a); 
  
        // can also be combined with 
        // assignment operator to provide shorthand 
        // assignment 
        // a=a&b 
        a &= b; 
        System.out.println("a= " + a); 
    } 
} 


















Output :
a&b = 5

a|b = 7

a^b = 2

~a = -6

a= 5 
Shift Operators: These operators are used to shift the bits of a number left or right thereby multiplying or dividing the number by two respectively. They can be used when we have to multiply or divide a number by two. General format:
 number shift_op number_of_places_to_shift;

Signed Right shift operator (>>) –
Shifts the bits of the number to the right and fills 0 on voids left as a result. The leftmost bit depends on the sign of initial number. Similar effect as of dividing the number with some power of two.
For example,


Example 1:

a = 10

a>>1 = 5 



Example 2:

a = -10 

a>>1 = -5

We preserve the sign bit.



Unsigned Right shift operator (>>>) –
Shifts the bits of the number to the right and fills 0 on voids left as a result. The leftmost bit is set to 0. (>>>) is unsigned-shift; it’ll insert 0. (>>) is signed, and will extend the sign bit.
For example,


Example 1:

a = 10

a>>>1 = 5



Example 2:

a = -10 

a>>>1 = 2147483643

DOES NOT preserve the sign bit. 

Left shift operator (<<) –
Shifts the bits of the number to the left and fills 0 on voids left as a result. Similar effect as of multiplying the number with some power of two.
For example,
a = 5 = 0000 0101

b = -10 = 1111 0110



a << 1 = 0000 1010 = 10

a << 2 = 0001 0100 = 20 



b << 1 = 0000 1010 = -20

b << 2 = 0001 0100 = -40 

Unsigned Left shift operator (<<<) –
Unlike unsigned Right Shift, there is no “<<<" operator in Java, because the logical (<<) and arithmetic left-shift (<<<) operations are identical.









 


 

 













// Java program to illustrate 
// shift operators 
public class operators { 
    public static void main(String[] args) 
    { 
  
        int a = 5; 
        int b = -10; 
  
        // left shift operator 
        // 0000 0101<<2 =0001 0100(20) 
        // similar to 5*(2^2) 
        System.out.println("a<<2 = " + (a << 2)); 
  
        // right shift operator 
        // 0000 0101 >> 2 =0000 0001(1) 
        // similar to 5/(2^2) 
        System.out.println("b>>2 = " + (b >> 2)); 
  
        // unsigned right shift operator 
        System.out.println("b>>>2 = " + (b >>> 2)); 
    } 
} 


















Output :
a<<2 = 20

b>>2 = -3

b>>>2 = 1073741821


Refer for – other Operators in Java





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