Package com.google.common.math

Class IntMath

java.lang.Object
com.google.common.math.IntMath
@GwtCompatible(emulated=true) @Deprecated(since="2022-12-01") public final class IntMath extends Object
Deprecated.
The Google Guava Core Libraries are deprecated and will not be part of the AEM SDK after April 2023
A class for arithmetic on values of type int. Where possible, methods are defined and named analogously to their BigInteger counterparts.

The implementations of many methods in this class are based on material from Henry S. Warren, Jr.'s Hacker's Delight, (Addison Wesley, 2002).

Similar functionality for long and for BigInteger can be found in LongMath and BigIntegerMath respectively. For other common operations on int values, see Ints.

Since:
11.0

  • Method Summary

    Modifier and Type
    Method
    Description
    static int
    binomial(int n, int k)
    Deprecated.
    Returns n choose k, also known as the binomial coefficient of n and k, or Integer.MAX_VALUE if the result does not fit in an int.
    static int
    checkedAdd(int a, int b)
    Deprecated.
    Returns the sum of a and b, provided it does not overflow.
    static int
    checkedMultiply(int a, int b)
    Deprecated.
    Returns the product of a and b, provided it does not overflow.
    static int
    checkedPow(int b, int k)
    Deprecated.
    Returns the b to the kth power, provided it does not overflow.
    static int
    checkedSubtract(int a, int b)
    Deprecated.
    Returns the difference of a and b, provided it does not overflow.
    static int
    divide(int p, int q, RoundingMode mode)
    Deprecated.
    Returns the result of dividing p by q, rounding using the specified RoundingMode.
    static int
    factorial(int n)
    Deprecated.
    Returns n!, that is, the product of the first n positive integers, 1 if n == 0, or Integer.MAX_VALUE if the result does not fit in a int.
    static int
    gcd(int a, int b)
    Deprecated.
    Returns the greatest common divisor of a, b.
    static boolean
    isPowerOfTwo(int x)
    Deprecated.
    Returns true if x represents a power of two.
    static int
    log10(int x, RoundingMode mode)
    Deprecated.
    Returns the base-10 logarithm of x, rounded according to the specified rounding mode.
    static int
    log2(int x, RoundingMode mode)
    Deprecated.
    Returns the base-2 logarithm of x, rounded according to the specified rounding mode.
    static int
    mean(int x, int y)
    Deprecated.
    Returns the arithmetic mean of x and y, rounded towards negative infinity.
    static int
    mod(int x, int m)
    Deprecated.
    Returns x mod m.
    static int
    pow(int b, int k)
    Deprecated.
    Returns b to the kth power.
    static int
    sqrt(int x, RoundingMode mode)
    Deprecated.
    Returns the square root of x, rounded with the specified rounding mode.

    Methods inherited from class java.lang.Object

    equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

  • Method Details

    • isPowerOfTwo

      public static boolean isPowerOfTwo(int x)
      Deprecated.
      Returns true if x represents a power of two.

      This differs from Integer.bitCount(x) == 1, because Integer.bitCount(Integer.MIN_VALUE) == 1, but Integer.MIN_VALUE is not a power of two.

    • log2

      public static int log2(int x, RoundingMode mode)
      Deprecated.
      Returns the base-2 logarithm of x, rounded according to the specified rounding mode.
      Throws:
      IllegalArgumentException - if x <= 0
      ArithmeticException - if mode is RoundingMode.UNNECESSARY and x is not a power of two

    • log10

      @GwtIncompatible("need BigIntegerMath to adequately test") public static int log10(int x, RoundingMode mode)
      Deprecated.
      Returns the base-10 logarithm of x, rounded according to the specified rounding mode.
      Throws:
      IllegalArgumentException - if x <= 0
      ArithmeticException - if mode is RoundingMode.UNNECESSARY and x is not a power of ten

    • pow

      @GwtIncompatible("failing tests") public static int pow(int b, int k)
      Deprecated.
      Returns b to the kth power. Even if the result overflows, it will be equal to BigInteger.valueOf(b).pow(k).intValue(). This implementation runs in O(log k) time.

      Compare checkedPow(int, int), which throws an ArithmeticException upon overflow.

      Throws:
      IllegalArgumentException - if k < 0

    • sqrt

      @GwtIncompatible("need BigIntegerMath to adequately test") public static int sqrt(int x, RoundingMode mode)
      Deprecated.
      Returns the square root of x, rounded with the specified rounding mode.
      Throws:
      IllegalArgumentException - if x < 0
      ArithmeticException - if mode is RoundingMode.UNNECESSARY and sqrt(x) is not an integer

    • divide

      public static int divide(int p, int q, RoundingMode mode)
      Deprecated.
      Returns the result of dividing p by q, rounding using the specified RoundingMode.
      Throws:
      ArithmeticException - if q == 0, or if mode == UNNECESSARY and a is not an integer multiple of b

    • mod

      public static int mod(int x, int m)
      Deprecated.
      Returns x mod m. This differs from x % m in that it always returns a non-negative result.

      For example:

       

 mod(7, 4) == 3
 mod(-7, 4) == 1
 mod(-1, 4) == 3
 mod(-8, 4) == 0
 mod(8, 4) == 0
      Throws:
      ArithmeticException - if m <= 0

    • gcd

      public static int gcd(int a, int b)
      Deprecated.
      Returns the greatest common divisor of a, b. Returns 0 if a == 0 && b == 0.
      Throws:
      IllegalArgumentException - if a < 0 or b < 0

    • checkedAdd

      public static int checkedAdd(int a, int b)
      Deprecated.
      Returns the sum of a and b, provided it does not overflow.
      Throws:
      ArithmeticException - if a + b overflows in signed int arithmetic

    • checkedSubtract

      public static int checkedSubtract(int a, int b)
      Deprecated.
      Returns the difference of a and b, provided it does not overflow.
      Throws:
      ArithmeticException - if a - b overflows in signed int arithmetic

    • checkedMultiply

      public static int checkedMultiply(int a, int b)
      Deprecated.
      Returns the product of a and b, provided it does not overflow.
      Throws:
      ArithmeticException - if a * b overflows in signed int arithmetic

    • checkedPow

      public static int checkedPow(int b, int k)
      Deprecated.
      Returns the b to the kth power, provided it does not overflow.

      pow(int, int) may be faster, but does not check for overflow.

      Throws:
      ArithmeticException - if b to the kth power overflows in signed int arithmetic

    • factorial

      public static int factorial(int n)
      Deprecated.
      Returns n!, that is, the product of the first n positive integers, 1 if n == 0, or Integer.MAX_VALUE if the result does not fit in a int.
      Throws:
      IllegalArgumentException - if n < 0

    • binomial

      @GwtIncompatible("need BigIntegerMath to adequately test") public static int binomial(int n, int k)
      Deprecated.
      Returns n choose k, also known as the binomial coefficient of n and k, or Integer.MAX_VALUE if the result does not fit in an int.
      Throws:
      IllegalArgumentException - if n < 0, k < 0 or k > n

    • mean

      public static int mean(int x, int y)
      Deprecated.
      Returns the arithmetic mean of x and y, rounded towards negative infinity. This method is overflow resilient.
      Since:
      14.0