我想知道sun.misc.unsafe.arrayIndexScale的用法，在javadoc中是这样说的:Reportthescalefactorforaddressingelementsinthestorageallocationofagivenarrayclass.However,arraysof"narrow"typeswillgenerallynotworkproperlywithaccessorslikegetByte(java.lang.Object,int),sothescalefactorforsuchclassesisreportedaszero.此方法返回一个in