Java Math multiplyExact() usage and example

Java Math Mathematical Methods

The Java Math multiyExact() method multiplies the specified numbers and returns the result.

The syntax of the multiplyExact() method is:

Math.multiplyExact(num1, num2)

Note: multiplyExact() is a static method. Therefore, we can access the method Math using the class name.

multipleExact() parameters

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

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

multipleExact() return value

• Returnstwo valuesofProduct

Example1: Java mathematical multiplication (Exact)

import java.lang.Math;
class Main {
　　public static void main(String[] args) {
　　　　//Create an int variable
　　　　int a =　5;
　　　　int b =　6;
　　　　//multipleExact() with int parameter
　　　　System.out.println(Math.multiplyExact(a, b));　　//　30
　　　　//　Create a long variable
　　　　long c =　7236L;
　　　　long d =　1721L;
　　　　//　multipliExact() with long type parameter
　　　　System.out.println(Math.multiplyExact(c, d));　　//　12453156
　　}
}

In the above example, we used the Math.multiplyExact() method with int and long variables to calculate the product of each number.

Example2: Math multipleExact() throws an exception

If the multiplication result overflows the data type, the 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 =　2;
　　　　//multipleExact() with int parameter
　　　　//Causes an exception
　　　　System.out.println(Math.multiplyExact(a, b));
　　}
}

In the above example, the value of a is the maximum int value and the value of b is2When we multiply a and b,

　　2147483647　*　2
=>　4294967294　　　　//　Out of the range of int type

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

Recommended Tutorials

• Math.addExact()

• Math.subtractExact()

• Math.incrementExact()

• Math.decrementExact()

• Math.negateExact()

• Math.toIntExact()

Java Math Mathematical Methods