Class Integers


  • public final class Integers
    extends Object
    Helps deal with integers.
    • Method Detail

      • parseInt

        public static int parseInt​(String s,
                                   int defaultValue)
        Parses the string argument as a signed decimal integer.
        Parameters:
        s - a String containing the int representation to parse, may be null or ""
        defaultValue - the return value, use defaultValue if s is null or ""
        Returns:
        the integer value represented by the argument in decimal.
        Throws:
        NumberFormatException - if the string does not contain a parsable integer.
      • parseInt

        public static int parseInt​(String s)
        Parses the string argument as a signed decimal integer.
        Parameters:
        s - a String containing the int representation to parse, may be null or ""
        Returns:
        the integer value represented by the argument in decimal.
        Throws:
        NumberFormatException - if the string does not contain a parsable integer.
      • ceilingNextPowerOfTwo

        public static int ceilingNextPowerOfTwo​(int x)
        Calculate the next power of 2, greater than or equal to x.

        From Hacker's Delight, Chapter 3, Harry S. Warren Jr.

        Parameters:
        x - Value to round up
        Returns:
        The next power of 2 from x inclusive