Difference between size and length methods

Question

What is the difference between  size   and  length   Is  size   only for arraylists and  length only for arrays

User · Answer

length variable    In Java  array  not java util Array  is a predefined class in the language itself  To find the elements of an array  designers used length variable  length is a field member in the predefined class   They must have given length   itself to have uniformity in Java  but did not  The reason is by performance  executing length variable is speedier than calling the method length    It is like comparing two strings with    and equals    equals   is a method call which takes more time than executing    operator   size   method    It is used to find the number of elements present in collection classes  It is defined in java util Collection interface

User · Answer

size   is a method specified in java util Collection  which is then inherited by every data structure in the standard library   length is a field on any array  arrays are objects  you just don t see the class normally   and length   is a method on java lang String  which is just a thin wrapper on a char   anyway   Perhaps by design  Strings are immutable  and all of the top-level Collection subclasses are mutable   So where you see  length  you know that s constant  and where you see  size  it isn t

User · Answer

length is constant which is used to find out the array storing capacity not the number of elements in the array   Example    int   a   new int 5    a length always returns 5  which is called the capacity of an array  But      number of elements in the array is called size   Example   int   a   new int 5  a 0    10   Here the size would be 1  but a length is still 5  Mind that there is no actual property or method called size on an array so you can t just call a size or a size   to get the value 1   The size   method is available for collections  length works with arrays in Java

User · Answer

Based on the syntax I m assuming that it is some language which is descendant of C  As per what I have seen  length is used for simple collection items like arrays and in most cases it is a property    size   is a function and is used for dynamic collection objects  However for all the purposes of using  you wont find any differences in outcome using either of them  In most implementations  size simply returns length property

User · Answer

I bet  no language specified  size   method returns length property   However valid for loop should looks like   for  int i   0  i  lt  values length  i

User · Answer

length is a field  containing the capacity  NOT the number of elements the array contains at the moment  of arrays  length   is a method used by Strings  amongst others   it returns the number of chars in the String  with Strings  capacity and number of containing elements  chars  have the same value  size   is a method implemented by all members of Collection  lists  sets  stacks       It returns the number of elements  NOT the capacity  some collections even don  t have a defined capacity  the collection contains

[java] Difference between size and length methods?

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