Java Math addExact() method usage and example

Java Math Mathematical Methods

The Java Math addExact() method adds the specified numbers and returns them.

The syntax of the addExact() method is:

Math.addExact(num1, num2)

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

addExact() parameter

• num1 / num2 - To return the first and second values whose sum is to be calculated

Note: The data types of these two values should be int or long.

addExact() return value

• Return the sum of two values

Example1: Java Math addExact()

import java.lang.Math;
class Main {
　　public static void main(String[] args) {
　　　　//Create an int variable
　　　　int a = ;　24;
　　　　int b = ;　33;
　　　　//　addExact() with int parameter
　　　　System.out.println(Math.addExact(a, b));　　//　57
　　　　//Create a long variable
　　　　long c = ;　12345678l;
　　　　long d = ;　987654321l;
　　　　//addExact() with long parameter
　　　　System.out.println(Math.addExact(c, d));　　//　999999999
　　}
}

In the above example, we used the Math.addExact() method with int and long variables to calculate the sum.

Example2: Math addExact() result overflow throws exception

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

import java.lang.Math;
class Main {
　　public static void main(String[] args) {
　　　　//Create an int variable.
　　　　//Maximum int value
　　　　int a = ;　2147483647;
　　　　int b = ;　1;
　　　　//addExact() with int parameters.
　　　　//Throws an exception
　　　　System.out.println(Math.addExact(a, b));
　　}
}

In the above example, the value of a is the maximum int value and the value of b is1When we add a and b,

　　2147483647　+　1
=>　2147483648　　　　//　Out of the range of int type

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

Recommended Tutorials

• Math.subtractExact()

• Math.multiplyExact()

• Math.incrementExact()

• Math.decrementExact()

• Math.negateExact()

• Math.toIntExact()

Java Math Mathematical Methods