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Java Operators


Java Operators

Operators are used to perform operations on variables and values.

In the example below, we use the + operator to add together two values:

Example

int x = 100 + 50;

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Although the + operator is often used to add together two values, like in the example above, it can also be used to add together a variable and a value, or a variable and another variable:

Example

int sum1 = 100 + 50;        // 150 (100 + 50)
int sum2 = sum1 + 250;      // 400 (150 + 250)
int sum3 = sum2 + sum2;     // 800 (400 + 400)

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Java divides the operators into the following groups:

  • Arithmetic operators
  • Assignment operators
  • Comparison operators
  • Logical operators
  • Bitwise operators

Arithmetic Operators

Arithmetic operators are used to perform common mathematical operations.

Operator Name Description Example Try it
+ Addition Adds together two values x + y Try it »
- Subtraction Subtracts one value from another x - y Try it »
* Multiplication Multiplies two values x * y Try it »
/ Division Divides one value by another x / y Try it »
% Modulus Returns the division remainder x % y Try it »
++ Increment Increases the value of a variable by 1 ++x Try it »
-- Decrement Decreases the value of a variable by 1 --x Try it »


Java Assignment Operators

Assignment operators are used to assign values to variables.

In the example below, we use the assignment operator (=) to assign the value 10 to a variable called x:

Example

int x = 10;

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The addition assignment operator (+=) adds a value to a variable:

Example

int x = 10;
x += 5;

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A list of all assignment operators:

Operator Example Same As Try it
= x = 5 x = 5 Try it »
+= x += 3 x = x + 3 Try it »
-= x -= 3 x = x - 3 Try it »
*= x *= 3 x = x * 3 Try it »
/= x /= 3 x = x / 3 Try it »
%= x %= 3 x = x % 3 Try it »
&= x &= 3 x = x & 3 Try it »
|= x |= 3 x = x | 3 Try it »
^= x ^= 3 x = x ^ 3 Try it »
>>= x >>= 3 x = x >> 3 Try it »
<<= x <<= 3 x = x << 3 Try it »

Java Comparison Operators

Comparison operators are used to compare two values:

Operator Name Example Try it
== Equal to x == y Try it »
!= Not equal x != y Try it »
> Greater than x > y Try it »
< Less than x < y Try it »
>= Greater than or equal to x >= y Try it »
<= Less than or equal to x <= y Try it »

Java Logical Operators

Logical operators are used to determine the logic between variables or values:

Operator Name Description Example Try it
&&  Logical and Returns true if both statements are true x < 5 &&  x < 10 Try it »
||  Logical or Returns true if one of the statements is true x < 5 || x < 4 Try it »
! Logical not Reverse the result, returns false if the result is true !(x < 5 && x < 10) Try it »

Java Bitwise Operators

Bitwise operators are used to perform binary logic with the bits of an integer or long integer.

Operator Description Example Same as Result Decimal
& AND - Sets each bit to 1 if both bits are 1 5 & 1 0101 & 0001 0001  1
| OR - Sets each bit to 1 if any of the two bits is 1 5 | 1 0101 | 0001 0101  5
~ NOT - Inverts all the bits ~ 5  ~0101 1010  10
^ XOR - Sets each bit to 1 if only one of the two bits is 1 5 ^ 1 0101 ^ 0001 0100  4
<< Zero-fill left shift - Shift left by pushing zeroes in from the right and letting the leftmost bits fall off 9 << 1 1001 << 1 0010 2
>> Signed right shift - Shift right by pushing copies of the leftmost bit in from the left and letting the rightmost bits fall off 9 >> 1 1001 >> 1 1100 12
>>> Zero-fill right shift - Shift right by pushing zeroes in from the left and letting the rightmost bits fall off 9 >>> 1 1001 >>> 1 0100 4

Note: The Bitwise examples above use 4-bit unsigned examples, but Java uses 32-bit signed integers and 64-bit signed long integers. Because of this, in Java, ~5 will not return 10. It will return -6. ~00000000000000000000000000000101 will return 11111111111111111111111111111010

In Java, 9 >> 1 will not return 12. It will return 4. 00000000000000000000000000001001 >> 1 will return 00000000000000000000000000000100


Test Yourself With Exercises

Exercise:

Multiply 10 with 5, and print the result.

System.out.println(10  5);

Start the Exercise