public static void copyMemory(Object srcBase,long srcOff,Object dstBase,long dstOff,long len){
  UNSAFE.copyMemory(srcBase,srcOff,dstBase,dstOff,len);
}

public static void copyMemory ( Object srcBase , long srcOff , Object dstBase , long dstOff , long len ) { UNSAFE . copyMemory ( srcBase , srcOff , dstBase , dstOff , len ) ; }
sets all bytes in a given block of memory to a copy of another block .
