The checkedMultiply(long a, long b) is a method of Guava’s LongMath Class which accepts two parameters a and b, and returns their product.
Syntax:
public static long checkedMultiply(long a, long b)
Parameters: The method accepts two long values a and b and computes their product.
Return Value: The method returns the product of long values passed to it, provided it does not overflow.
Exceptions: The method checkedMultiply(long a, long b) throws ArithmeticException if the product i.e, (a – b) overflows in signed long arithmetic.
Below examples illustrate the implementation of above method:
Example 1:
// Java code to show implementation of// checkedMultiply(long a, long b) method// of Guava's LongMath class import java.math.RoundingMode;import com.google.common.math.LongMath; class GFG { // Driver code public static void main(String args[]) { long a1 = 25; long b1 = 36; // Using checkedMultiply(long a, long b) // method of Guava's LongMath class long ans1 = LongMath.checkedMultiply(a1, b1); System.out.println("Product of " + a1 + " and " + b1 + " is: " + ans1); long a2 = 150; long b2 = 667; // Using checkedMultiply(long a, long b) // method of Guava's LongMath class long ans2 = LongMath.checkedMultiply(a2, b2); System.out.println("Product of " + a2 + " and " + b2 + " is: " + ans2); }} |
Output:
Product of 25 and 36 is: 900 Product of 150 and 667 is: 100050
Example 2:
// Java code to show implementation of// checkedMultiply(long a, long b) method// of Guava's LongMath class import java.math.RoundingMode;import com.google.common.math.LongMath; class GFG { static long findDiff(long a, long b) { try { // Using checkedMultiply(long a, long b) method // of Guava's LongMath class // This should throw "ArithmeticException" // as the product overflows in signed // long arithmetic long ans = LongMath.checkedMultiply(a, b); // Return the answer return ans; } catch (Exception e) { System.out.println(e); return -1; } } // Driver code public static void main(String args[]) { long a = Long.MIN_VALUE; long b = 452; try { // Function calling findDiff(a, b); } catch (Exception e) { System.out.println(e); } }} |
Output:
java.lang.ArithmeticException: overflow
