What is Math.negateExact() in Java?

The negateExact method takes a single argument, changes the sign of the passed value, and returns it.

The arguments will be either int or long. The negateExact method is a static method present in the Math class.

Syntax

public static long negateExact(long a);

public static int negateExact(int a);

Arguments

a: The value of the sign to be changed (int/long).

Return value

This method reverses the sign of the value and returns it.

The negateExact method is equivalent to:

- (argument1)

Example

import java.lang.Math;
class NegateExactTest {
    public static void main(String cmdArgs[]) {
        int a = 20;
        int negationA = Math.negateExact(a);
        System.out.print("The negation of "+ a + " is ");
        System.out.println(negationA);
        int b = -10;
        int negationB = Math.negateExact(b);
        System.out.print("The negation of "+ b + " is ");
        System.out.println(negationB);
        long la = -20;
        long lNegationA = Math.negateExact(la);
        System.out.print("The negation of "+ la + " is ");
        System.out.println(lNegationA);
        long lb = 10;
        long lNegationB = Math.negateExact(lb);
        System.out.print("The negation of "+ lb + " is ");
        System.out.println(lNegationB);        
    }
}

In the code above:

We created four variables, a and b, of the int and la type, and lb of the long type.
We called negateExact on all of the created variables. This will apply negation to the variable and return the value with the opposite sign.

The negateExact method will throw ArithmeticException if:

The argument is int and the negation overflows the int value.
The argument is long and the negation overflows the int value.

Example

For example, consider the argument is int. The ArithmeticException will be thrown if the negation of the int argument is lesser than the minimum value or greater than the maximum value that the int type can hold.