Java String array is there a size of method

Question

I come from a php background and in php  there is an array size   function which tells you how many elements in the array are used    Is there a similar method for a String   array  Thanks

User · Answer

array length final property  it is public and final property  It is final because arrays in Java are immutable by size  but mutable by element s value

User · Answer

There is a difference between length of String and array to clarify    int a      1  2  3  4   String s    1234    a length   gives the length of the array  s length     gives the length of the string

User · Answer

In java there is a length field that you can use on any array to find out it s size       String   s   new String 10       System out println s length

User · Answer

Not really the answer to your question  but if you want to have something like an array that can grow and shrink you should not use an array in java  You are probably best of by using ArrayList or another List implementation   You can then call size   on it to get it s size

User · Answer

Arrays are objects and they have a length field   String   haha     olle    bulle     haha length would be 2

User · Answer

Also  it s probably useful to note that if you have a multiple dimensional Array  you can get the respective dimension just by appending a    0   to the array you are querying until you arrive at the appropriate  axis tuple dimension   This is probably better explained with the following code   public class Test       public static void main String   args           String     moo   new String 5  12            System out println moo length     Prints the size of the First Dimension in the array         System out println moo 0  length    Prints the size of the Second Dimension in the array            Which produces the output   5 12

User · Answer

If you want a function to do this  Object array   new String 10   int size   Array getlength array     This can be useful if you don t know what type of array you have e g  int    byte   or Object

User · Answer

Yes   length  property-like  not a method    String   array   new String 10   int size   array length

User · Answer

All the above answers are proper  The important thing to observe is arrays have length attribute but not length method  Whenever you use strings and arrays in java the three basic models you might face are    String s new String  vidyasagar    System out println s length         In this case we are using only String  No length attribute for Strings  we have to  use length   method  int   s new int 10      System out println s length       here we use length attribute of arrays  String   s new String 10   System out println s length        Here even though data type is String  it s not a single String  s is a reference for  array of Strings  So    we use length attribute of arrays to      express how many strings can fit in that array

User · Answer

The answer is  All of them   A java array is allocated with a fixed number of element slots  The  length  attribute will tell you how many  That number is immutable for the life of the array  For a resizable equivalent  you need one of the java util List classes - where you can use the size   method to find out how many elements are in use   However  there s  In use  and then there s In Use  In an class object array  you can have element slots whose elements are null objects  so even though they count in the length attribute  but most people s definitions  they re not in use  YMMV  depending on the application   There s no builtin function for returning the null non-null counts   List objects have yet another definition of  In Use   To avoid excessive creation destruction of the underlying storage structures  there s typically some padding in these classes  It s used internally  but isn t counted in the returned size   method  And if you attempt to access those items without expanding the List  via the add methods   you ll get an illegal index exception   So for Lists  you can have  In Use  for non-null  committed elements  All committed elements  including null elements   or All elements  including the expansion space presently allocated

User · Answer

array length   It is actually a final member of the array  not a method

[java] Java String array: is there a size of method?

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