Java Math.multiplyExact() method

The java.lang.Math.mutliplyExact() returns the product of the arguments. It will throw an exception if the result overflows either int or long.

Syntax

public static int multiplyExact(int a, int b) 
public static long multiplyExact(long a, long b)
public static long multiplyExact(long a, int b)

Parameter

a = the first value
b = the second value 

Return

If one of the arguments is Integer.MAX_VALUE or Integer.MIN_VALUE or Long.MAX_VALUE or Long.MIN_VALUE, it will throw an ArithmeticException.

Example 1

public class MultiplyExactExample1
{
    public static void main(String[] args) 
    {
        int a = 739;
        int b = 5;
        // Input two values, Output multiplication of a and b
        System.out.println(Math.multiplyExact(a, b));
    }
}

Test it Now

Output:

Example 2

public class MultiplyExactExample2
{
    public static void main(String[] args) 
    {
        long a = Long.MAX_VALUE;
        long b = 462;
        // Input long overflow, Output AirthmeticException
        System.out.println(Math.multiplyExact(a, b));
    }
}

Test it Now

Output:

Exception in thread "main" java.lang.ArithmeticException: long overflow
	at java.lang.Math.multiplyExact(Math.java:892)
	at multiplyExactExample2.main(multiplyExactExample2.java:8)

Example 3

public class MultiplyExactExample3
{
    public static void main(String[] args) 
    {
        int x = Integer.MIN_VALUE;
        int y= 33;
        // return Airthmetic Exception 
        System.out.println(Math.multiplyExact(x, y));
    }
}

Test it Now

Output:

Exception in thread "main" java.lang.ArithmeticException: integer overflow
	at java.lang.Math.multiplyExact(Math.java:867)
	at MultiplyExactExample3.main(MultiplyExactExample3.java:8)

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