Java Math.subtractExact() method

The java.lang.Math.subtractExact() returns the difference of the arguments. It will throw an exception if the result overflows either int or long.

Syntax

public static int subtractExact(int a, int b) 
public static long subtractExact(long a, long b)

Parameter

a = the first value
b = the second value to subtract from the first

Return

If one of the arguments is Integer.MIN_VALUE or Long.MIN_VALUE, it will throw an ArithmeticException.

Example 1

public class SubtractExactExample1
{
    public static void main(String[] args) 
    {
        long a = 732;
        long b = 190;
        // Input two values, Output subtraction of a and b 
        System.out.println(Math.subtractExact(a, b));
    }
}

Test it Now

Output:

Example 2

public class SubtractExactExample2
{
    public static void main(String[] args) 
    {
        int a = 352;
        int b = Integer.MIN_VALUE;
        // Input int overflow, Output AirthmeticException        
        System.out.println(Math.subtractExact(a, b));
    }
}

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Output:

Exception in thread "main" java.lang.ArithmeticException: integer overflow
	at java.lang.Math.subtractExact(Math.java:829)
	at SubtractExactExample2.main(SubtractExactExample2.java:8)

Example 3

public class SubtractExactExample3
{
    public static void main(String[] args) 
    {
        long a = Long.MIN_VALUE;
        long b = 42;
        // Input long overflow, Output AirthmeticException
        System.out.println(Math.subtractExact(a, b));
    }
}	

Test it Now

Output:

Exception in thread "main" java.lang.ArithmeticException: long overflow
	at java.lang.Math.subtractExact(Math.java:849)
	at SubtractExactExample3.main(SubtractExactExample3.java:8)

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