Java Math subtractExact() Method

The subtractExact() method of Java Math class returns mathematical difference of the specified two arguments, throwing an exception if the result overflows int or long.

Syntax:

1. public static int subtractExact (int x, int y)
2. public static long subtractExact (long x, long y)

Parameters:

The parameters ‘x’ and ‘y’ represent the first and second number.

Return Value:

The subtractExact () method returns the result after subtraction of the specified arguments.

Throws:

The subtractExact () method throw:

ArithmeticException- if the result overflows int or long.

Example 1:

public class JavaMathSubtractExactExample1 {
    public static void main(String[] args) {
        int a=90;
        int b=10;
        //returns the result after subtracting the two int values
        System.out.println("Difference: "+Math.subtractExact(a,b));
    }
}

Output:

Difference: 80

Example 2:

public class JavaMathSubtractExactExample2 {
    public static void main(String[] args) {
        //return zero, if both the arguments are same
        int a=10;
        int b=10;
        System.out.println("Difference = "+Math.subtractExact(a,b));
    }
}

Output:

Difference = 0

Example 3:

public class JavaMathSubtractExactExample3 {
    public static void main(String[] args) {
        //returns an exception is the result overflows a long
        long x = Long.MAX_VALUE;
        long y=  Long.MIN_VALUE;
        System.out.println("Difference : "+Math.subtractExact(x,y));
    }
}

Output:

Exception in thread "main" java.lang.ArithmeticException: long overflow
           at java.lang.Math.subtractExact(Math.java:849)
           at com.TutorialsAndExamples.JavaMathSubtractExactExample3.main(JavaMathSubtractExact
Example3.java:8)