Float.NaN == Float.NaN

为什么这种比较会给我“假”？我查看了源代码，Float.NaN被定义为

/** 
 * A constant holding a Not-a-Number (NaN) value of type
 * <code>float</code>.  It is equivalent to the value returned by
 * <code>Float.intBitsToFloat(0x7fc00000)</code>.
 */
public static final float NaN = 0.0f / 0.0f;

编辑：令人惊讶的是，如果我这样做：

System.out.println("FC " + (Float.compare(Float.NaN, Float.NaN)));

它给了我.所以认为NaN等于自己！0Float.compare()