Java Guava | LongMath.checkedMultiply(int a, int b) method with Examples

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

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