Java Math addExact(long x, long y) method

The java.lang.Math.addExact() is a built-in math function in java which returns the sum of its arguments. It throws an exception if the result overflows a long.As addExact(long x, long y) is static, so object creation is not required. 

Syntax :

public static long addExact(long x, long y)
Parameter :
 a : the first value
 b : the second value
Return :
This method returns  the sum of its arguments.
Exception :
It throws ArithmeticException - if the result overflows a long

Example :To show working of java.lang.Math.addExact() method. 

java

// Java program to demonstrate working
// of java.lang.Math.addExact() method
import java.lang.Math;

class Gfg1 {

    // driver code
    public static void main(String args[])
    {
        long x = 9999999999l;
        long y = 1l;

        System.out.println(Math.addExact(x, y));
    }
}

Output:

10000000000

java

// Java program to demonstrate working
// of java.lang.Math.addExact() method
import java.lang.Math;

class Gfg2 {

    // driver code
    public static void main(String args[])
    {
        long a = Long.MAX_VALUE;
        long b = 2l;

        System.out.println(Math.addExact(a, b));
    }
}

Output:

Runtime Error :
Exception in thread "main" java.lang.ArithmeticException: long overflow
    at java.lang.Math.addExact(Math.java:809)
    at Gfg2.main(File.java:13)