> ## Documentation Index
> Fetch the complete documentation index at: https://docs.syntblaze.com/llms.txt
> Use this file to discover all available pages before exploring further.
# Java Bitwise XOR Assignment
The `^=` operator is the bitwise exclusive OR (XOR) compound assignment operator in Java. It evaluates the bitwise XOR between the left-hand operand and the right-hand operand, and subsequently assigns the computed result back to the left-hand operand.
## Syntax and Equivalence
```java theme={"dark"}
leftOperand ^= rightOperand;
```
Internally, the Java compiler evaluates this expression as:
```java theme={"dark"}
leftOperand = (Type) (leftOperand ^ rightOperand);
```
The inclusion of the implicit cast `(Type)` is a critical language feature. If the left operand is of a type narrower than `int` (such as `byte`, `short`, or `char`), the bitwise operation is performed using 32-bit `int` promotion. The compound assignment operator automatically handles the narrowing primitive conversion back to the original type, preventing potential compilation errors.
## Mechanics on Integral Types
When applied to integer types (`byte`, `short`, `int`, `long`, `char`), the operator compares the binary representations of both operands bit by bit. The resulting bit is `1` if the corresponding bits in the operands are different, and `0` if they are identical.
**Truth Table for Bitwise XOR:**
* `0 ^ 0 = 0`
* `0 ^ 1 = 1`
* `1 ^ 0 = 1`
* `1 ^ 1 = 0`
**Execution Example:**
```java theme={"dark"}
int a = 10; // Binary representation: 1010
int b = 6; // Binary representation: 0110
a ^= b; // Bitwise XOR evaluation:
// 1010
// ^ 0110
// ---
// 1100 (Decimal 12)
// 'a' is now assigned the value 12
```
## Mechanics on Boolean Types
When applied to `boolean` operands, `^=` functions as a logical XOR assignment. It evaluates to `true` if and only if the left and right operands possess strictly opposing boolean values.
**Execution Example:**
```java theme={"dark"}
boolean state = true;
state ^= false; // true ^ false -> true. 'state' remains true.
state ^= true; // true ^ true -> false. 'state' becomes false.
```
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