Method Detail

• floatToIntBits

  public static int floatToIntBits(float f)

  Returns the representation of the specified floating-point value according to the IEEE 754 floating-point "single format" bit layout, after first mapping -0.0 to 0.0. This method is identical to Float.floatToIntBits(float) except that an integer value of 0 is returned for a floating-point value of -0.0f. This is done for the purpose of computing a hash code that satisfies the contract of hashCode() and equals(). The equals() method in some Java 3D classes does a pair-wise "==" test on each floating-point field in the class. Since 0.0f == -0.0f returns true, we must also return the same hash code for two objects, one of which has a field with a value of -0.0f and the other of which has a cooresponding field with a value of 0.0f.

  Parameters:

  f - an input floating-point number

  Returns:

  the integer bits representing that floating-point number, after first mapping -0.0f to 0.0f

• doubleToLongBits

  public static long doubleToLongBits(double d)

  Returns the representation of the specified floating-point value according to the IEEE 754 floating-point "double format" bit layout, after first mapping -0.0 to 0.0. This method is identical to Double.doubleToLongBits(double) except that an integer value of 0L is returned for a floating-point value of -0.0. This is done for the purpose of computing a hash code that satisfies the contract of hashCode() and equals(). The equals() method in some Java 3D classes does a pair-wise "==" test on each floating-point field in the class. Since 0.0 == -0.0 returns true, we must also return the same hash code for two objects, one of which has a field with a value of -0.0 and the other of which has a cooresponding field with a value of 0.0.

  Parameters:

  d - an input double precision floating-point number

  Returns:

  the integer bits representing that floating-point number, after first mapping -0.0f to 0.0f