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 an int.As addExact(int a, int b) is static, so object creation
is not required.
Syntax :
public static int addExact(int a, int b) 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 an int
Example :To show working of java.lang.Math.addExact() method.
// Java program to demonstrate working// of java.lang.Math.addExact() methodimport java.lang.Math;  class Gfg1 {      // driver code    public static void main(String args[])    {        int a = 100;        int b = 200;          System.out.println(Math.addExact(a, b));    }} |
Output:
300
// Java program to demonstrate working// of java.lang.Math.addExact() methodimport java.lang.Math;  class Gfg2 {      // driver code    public static void main(String args[])    {        int x = Integer.MAX_VALUE;        int y = 200;          System.out.println(Math.addExact(x, y));    }} |
Output:
Runtime Error :
Exception in thread "main" java.lang.ArithmeticException: integer overflow
at java.lang.Math.addExact(Math.java:790)
at Gfg2.main(File.java:13)
