public static long multiplyHigh(long x, long y)

// Java program to demonstrate
// multiplyHigh() method of StrictMath class
  
public class GFG {
  
    // Main method
    public static void main(String[] args)
    {
  
        // two long values
        long a = 45267356745l, b = 45676556735l;
  
        // apply multiplyHigh method
        long c = StrictMath.multiplyHigh(a, b);
  
        // print result
        System.out.println(a + " * "
                           + b + " = "
                           + c);
    }
}

45267356745 * 45676556735 = 112

// Java program to demonstrate
// multiplyHigh() method of StrictMath class
  
public class GFG {
  
    // Main method
    public static void main(String[] args)
    {
  
        // two Integer values
        long a = Long.MAX_VALUE, b = Long.MAX_VALUE;
  
        // apply multiplyHigh method
        long c = StrictMath.multiplyHigh(a, b);
  
        // print result
        System.out.println(a + " * "
                           + b + " = " + c);
    }
}

9223372036854775807 * 9223372036854775807 = 4611686018427387903