Java Math negateExact() method usage and example

Java Math Mathematical Methods

The Java Math negateExact() method reverses the sign of the specified number and returns it.

The syntax of the negateExact() method is:

Math.negateExact(num)

Note: negateExact() is a static method. Therefore, we can use the Math class name to access this method.

negateExact() parameter

• num - The parameter to be negated

Note: The parameter's data type should be int or long.

negateExact() return value

• Returns the value after reversing the sign of the specified parameter

Example1: Java Math.negateExact()

class Main {
　　public static void main(String[] args) {
　　　　//Create an integer variable
　　　　int a =　65;
　　　　int b =　-25;
　　　　//NegateExact() with int parameter
　　　　System.out.println(Math.negateExact(a));　　//　-65
　　　　System.out.println(Math.negateExact(b));　　//　25
　　　　//Create a long variable
　　　　long c =　52336L;
　　　　long d =　-445636L;
　　　　//NegateExact() with long parameter
　　　　System.out.println(Math.negateExact(c));　　//　-52336
　　　　System.out.println(Math.negateExact(d));　　//　445636
　　}
}

In the above example, we used the Math.negateExact() method with int and long variables to reverse the signs of each variable.

Example2: Math.negateExact() throws an exception

If the negation result overflows the data type, the negateExact() method will throw an exception. That is, the result should be within the range of the specified variable's data type.

class Main {
　　public static void main(String[] args) {
　　　　//Create an int variable.
　　　　//Minimum int value
　　　　int a =　-2147483648;
　　　　//NegateExact() with int parameter.
　　　　//Throw an exception
　　　　System.out.println(Math.negateExact(a));
　　}
}

In the above example, the value of a is the minimum value of int. Here, the negateExact() method changes the sign of the variable a.

　　　-(a)　　
=>　-(-2147483648)
=>　2147483648　　　　//　out of range of int type

Therefore, the negateExact() method triggers an integer overflow exception.

Recommended Tutorials

• Math.addExact()

• Math.subtractExact()

• Math.multiplyExact()

• Math.incrementExact()

• Math.decrementExact()

• Math.toIntExact()

Java Math Mathematical Methods