Java ArrayList Index

Question

int   alist   new int  3   alist add  apple    alist add  banana    alist add  orange      Say that I want to use the second item in the ArrayList  What is the coding in order to get the following output   output   banana

User · Answer

In order to store Strings in an dynamic array  add-method  you can t define it as an array of integers   int 3     You should declare it like this   ArrayList lt String gt  alist   new ArrayList lt String gt     alist add  apple     alist add  banana     alist add  orange      System out println  alist get 1

User · Answer

Using an Array   String   fruits   new String 3      make a 3 element array fruits 0   apple   fruits 1   banana   fruits 2   orange   System out println fruits 1       output the second element   Using a List  ArrayList lt String gt  fruits   new ArrayList lt String gt     fruits add  apple    fruits add  banana    fruits add  orange    System out println fruits get 1

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Here is how I would write it   String   fruit    apple banana orange  split       System out println fruit 1

User · Answer

You have ArrayList all wrong     You can t have an integer array and assign a string value  You cannot do a add   method in an array   Rather do this   List lt String gt  alist   new ArrayList lt String gt     alist add  apple    alist add  banana    alist add  orange     String value   alist get 1     returns the 2nd item from list  in this case  banana    Indexing is counted from 0 to N-1 where N is size   of list

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Exactly as arrays in all C-like languages  The indexes start from 0  So  apple is 0  banana is 1  orange is 2 etc

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The big difference between primitive arrays  amp  object-based collections  e g   ArrayList  is that the latter can grow  or shrink  dynamically  Primitive arrays are fixed in size  Once you create them  their size doesn t change  though the contents can

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Read more about  Array and ArrayList   List lt String gt  aList   new ArrayList lt String gt     aList add  apple       aList add  banana       aList add  orange       String result   alist get 1      this will retrieve banana   Note  Index starts from 0 i e  Zero     Resource

[java] Java ArrayList Index

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