Java unary operators are operators that operate on a single operand. The following are the unary operators in Java:

1. Unary plus: +
   The unary plus operator simply returns the value of the operand.

int a = 10;
int result = +a; // result is 10

2. Unary minus: -
   The unary minus operator negates the value of the operand.

int a = 10;
int result = -a; // result is -10

3. Increment: ++
   The increment operator adds 1 to the value of the operand.

int a = 10;
a++; // a is now 11

4. Decrement: --
   The decrement operator subtracts 1 from the value of the operand.

int a = 10;
a--; // a is now 9

5. Logical NOT: !
   The logical NOT operator returns the opposite boolean value of the operand.

boolean a = true;
boolean result = !a; // result is false