Java Math addExact() Method

The addExact() method of Math class returns the sum of the two arguments, throwing an exception if the result overflows a long or an int.

Syntax

public static int addExact (int x, int y)

public static long addExact (long x, long y)

Parameters

x= first value

y= second value

Return Value

The addExact () method returns the sum of the arguments.

Throws

The addExact() method throws:

ArithmeticException- if the result overflows an int or a long

Example 1:

public class JavaMathAddExactExample1 {
    public static void main(String[] args) {
        //returns the sum of the arguments.
        int x=-23;
        int y=123;
        System.out.println("Sum : "+ Math.addExact(x,y));
    }
}

Output:

Sum : 100

Example 2:

public class JavaMathAddExactExample2 {
    public static void main(String[] args) {
      int x=-109;
      int y=109;
      System.out.println("Sum : "+ Math.addExact(x,y));
    }
}

Output:

Sum : 0

Example 3:

public class JavaMathAddExactExample3 {
    public static void main(String[] args) {
        int x=Integer.MAX_VALUE;
        int y=Integer.MIN_VALUE;
        System.out.println("Sum : ");
        System.out.print(x+"+"+"("+y+") = ");
        System.out.println(Math.addExact(x,y));
    }
}

Output:

Sum :
2147483647+(-2147483648) = -1

Example 4:

public class JavaMathAddExactExample4 {
    public static void main(String[] args) {
        long x=95444353546386l;
        long y=Long.MAX_VALUE;
        System.out.println(Math.addExact(x,y));
    }
}

Output:

Exception in thread "main" java.lang.ArithmeticException: long overflow
at java.lang.Math.addExact(Math.java:809)
at
com.TutorialsAndExamples.JavaMathAddExactExample4.main(JavaMathAddExactExample4.java:7)