Java Math subtractExact() Method
Java Math Class
Java Math class provides several methods to perform several operations on math calculations like max(), min(), sin(), cos(), round(), ceil(), floor(), abs() etc.
The java.lang.Math class contains various methods for performing basic numeric operations
Here, in the page we will discuss about the math subtractExact() Method in java.
Java Math subtractExact() Method :
The Math.subtractExact(int x, int y) method is a static method in the java.lang.Math class that returns the result of x – y, throwing an ArithmeticException if the result overflows an int. This method is equivalent to the following code: or we can say that returns the difference of the arguments, throwing an exception if the result overflows an int.
Note: The data type of both values should be either int or long.
Syntax :
public static int subtractExact(int x,int y) public static long subtractExact(long x,long y)
Parameters :
x - the first value
y - the second value to subtract from the first
y - the second value to subtract from the first
Throws Exception :
ArithmeticException - if the result overflows an int or long
Return Value :
This method returns the difference of the arguments
Example 1 :
Run
public class Main {
public static void main(String[] args) {
int x = 100;
int y = 50;
int resultInt = Math.subtractExact(x, y);
System.out.println(resultInt);
long a = 200L;
long b = 100L;
long resultLong = Math.subtractExact(a, b);
System.out.println(resultLong);
}
}
Output :
50 100
Explanation :
In this example, the Math.subtractExact() method is used to subtract y from x for int values and b from a for long values. Since the results of both operations do not overflow the destination data types, no ArithmeticException is thrown and the results are printed to the console.
Example 2:
Run
public class Main {
public static void main(String[] args) {
try {
int resultInt = Math.subtractExact(Integer.MAX_VALUE, 1);
System.out.println(resultInt);
} catch (ArithmeticException e) {
System.out.println("The result overflowed an int");
}
try {
long resultLong = Math.subtractExact(Long.MAX_VALUE, 1);
System.out.println(resultLong);
} catch (ArithmeticException e) {
System.out.println("The result overflowed a long");
}
}
}
Output :
The result overflowed an int The result overflowed a long
Note : The overflow depends upon the complier like on which architecture they have been made .
Explanation :
In this example, the Math.subtractExact() method is used to subtract 1 from the maximum value that can be stored in an int and a long. Since the result of both operations would overflow the destination data type, an ArithmeticException is thrown in both cases.
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