question: public static long firstFieldOffset ( Class clazz ) { long minSize = roundUpTo8 ( headerSize ( clazz ) ) ; while ( clazz != Object . class ) { for ( Field f : clazz . getDeclaredFields ( ) ) { if ( ( f . getModifiers ( ) & Modifier . STATIC ) == 0 ) { long offset = unsafe . objectFieldOffset ( f ) ; if ( offset < minSize ) { minSize = offset ; } } } clazz = clazz . getSuperclass ( ) ; } return minSize ; }
target:  Returns the offset of the first field in the range [headerSize, sizeOf].