Java math addExact: add two numbers and throw exception when the result overflows

 Java Math class provides addExact method, which take two integer /or long arguments and return the sum of its arguments, throw an exception if the result overflows an int or long.

 

Signature

public static int addExact(int x, int y)

Returns the sum of its arguments, throwing an exception if the result overflows an int.

 

public static long addExact(long x, long y)

Returns the sum of its arguments, throwing an exception if the result overflows a long.

 

Find the below working application.

 

AddExactDemo.java

package com.sample.app;

public class AddExactDemo {

    public static void main(String[] args) {

        System.out.println("Math.addExact(10, 20) : " + Math.addExact(10, 20));
        System.out.println("Math.addExact(10l, 20l) : " + Math.addExact(10l, 20l) +"\n");

        int a = Integer.MAX_VALUE;
        int b = 10;

        try {
            System.out.println("Math.addExact(" + a + ", " + b + ") : ");
             Math.addExact(a, b);
        } catch (ArithmeticException e) {
            e.printStackTrace();
        }

        System.out.println();

        long c = Long.MAX_VALUE;
        long d = 10l;

        try {
            System.out.println("Math.addExact(" + c + ", " + d + ") : ");
            Math.addExact(c, d);
        } catch (ArithmeticException e) {
            e.printStackTrace();
        }
    }

}

Output

Math.addExact(10, 20) : 30
Math.addExact(10l, 20l) : 30

Math.addExact(2147483647, 10) : 
java.lang.ArithmeticException: integer overflow
    at java.lang.Math.addExact(Math.java:790)
    at com.sample.app.AddExactDemo.main(AddExactDemo.java:15)

Math.addExact(9223372036854775807, 10) : 
java.lang.ArithmeticException: long overflow
    at java.lang.Math.addExact(Math.java:809)
    at com.sample.app.AddExactDemo.main(AddExactDemo.java:27)

 

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