question: public boolean equals ( java . lang . Object obj ) { return obj != null && obj . getClass ( ) == getClass ( ) && ( ( Float ) obj ) . value == value ; }
target:  Compares this object against some other object. The result is true if and only if the argument is not null and is a Float object that represents a float that has the identical bit pattern to the bit pattern of the float represented by this object. For this purpose, two float values are considered to be the same if and only if the method returns the same int value when applied to each. Note that in most cases, for two instances of class Float, f1 and f2, the value of f1.equals(f2) is true if and only if f1.floatValue() == f2.floatValue() also has the value true. However, there are two exceptions: If f1 and f2 both represent Float.NaN, then the equals method returns true, even though Float.NaN==Float.NaN has the value false. If f1 represents +0.0f while f2 represents -0.0f, or vice versa, the equal test has the value false, even though 0.0f==-0.0f has the value true. This definition allows hashtables to operate properly.