Remove a specific string from an array of string

Question

I have an array like this   String n       google   microsoft   apple      What I want to do is to remove  apple     My problem is very basic however I searched the website and I found out that java doesn t really support the deleting feature from an array I also heard to use Java Utils  because it s so simple to remove an item    I tried to find Java Utils on google  but almost all links are dead   So finally   is there any way to remove a string from an array of string   Even if I use an ArrayList I can t find a method to generate a random item in it  For ex  in a normal array I generate a string like this   String r   myAL rgenerator nextInt myAL length      In an arraylist it doesn t work    maybe you know a solution

User · Answer

import java util     class Array       public static void main String args              ArrayList al   new ArrayList            al add  google            al add  microsoft            al add  apple            System out println al             i only remove the apple           al remove 2           System out println al

User · Answer

You can t remove anything from an array - they re always fixed length  Once you ve created an array of length 3  that array will always have length 3   You d be better off with a List lt String gt   e g  an ArrayList lt String gt    List lt String gt  list   new ArrayList lt String gt     list add  google    list add  microsoft    list add  apple    System out println list size        3  list remove  apple    System out println list size        2   Collections like this are generally much more flexible than working with arrays directly   EDIT  For removal   void removeRandomElement List lt   gt  list  Random random        int index   random nextInt list size         list remove index

User · Answer

Define  remove    Arrays are fixed length and can not be resized once created  You can set an element to null to remove an object reference   for  int i   0  i  lt  myStringArray length    i          if  myStringArray i  equals stringToRemove                 myStringArray i    null          break            or  myStringArray indexOfStringToRemove    null    If you want a dynamically sized array where the object is actually removed and the list  array  size is adjusted accordingly  use an ArrayList lt String gt   myArrayList remove stringToRemove      or   myArrayList remove indexOfStringToRemove     Edit in response to OP s edit to his question and comment below  String r   myArrayList get rgenerator nextInt myArrayList size

User · Answer

It is not possible in on step or you need to keep the reference to the array  If you can change the reference this can help         String   n   new String    google   microsoft   apple          final List lt String gt  list    new ArrayList lt String gt           Collections addAll list  n          list remove  apple          n   list toArray new String list size        I not recommend the following but if you worry about performance         String   n   new String    google   microsoft   apple          final String   n2   new String 2          System arraycopy n  0  n2  0  n2 length         for  int i   0  j   0  i  lt  n length  i                    if   n i  equals  apple                        n2 j    n i             j                              I not recommend it because the code is a lot more difficult to read and maintain

User · Answer

Arrays in Java aren t dynamic  like collection classes  If you want a true collection that supports dynamic addition and deletion  use ArrayList lt    If you still want to live with vanilla arrays  find the index of string  construct a new array with size one less than the original  and use System arraycopy   to copy the elements before and after  Or write a copy loop with skip by hand  on small arrays the difference will be negligible

[java] Remove a specific string from an array of string

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