How to append elements at the end of ArrayList in Java

Question

I am wondering  how do I append an element to the end of an ArrayList in Java  Here is the code I have so far    public class Stack        private ArrayList lt String gt  stringList   new ArrayList lt String gt          RandomStringGenerator rsg   new RandomStringGenerator         private void push            String random   rsg randomStringGenerator            ArrayList add random               randomStringGenerator  is a method which generates a random String    I basically want to always append the random string at the end of the ArrayList  much like a stack  Hence the name  push     Thank you so much for your time

User · Answer

I ran into a similar problem and just passed the end of the array to the ArrayList add   index param like so   public class Stack        private ArrayList lt String gt  stringList   new ArrayList lt String gt          RandomStringGenerator rsg   new RandomStringGenerator         private void push            String random   rsg randomStringGenerator            stringList add stringList size    random

User · Answer

Here is the syntax  along with some other methods you might find useful         add to the end of the list     stringList add random          add to the beginning of the list     stringList add 0   random          replace the element at index 4 with random     stringList set 4  random          remove the element at index 5     stringList remove 5          remove all elements from the list     stringList clear

User · Answer

I know this is an old question  but I wanted to make an answer of my own  here is another way to do this if you  really  want to add to the end of the list instead of using list add str  you can do it this way  but I don t recommend    String   items   new String    Hello    World            ArrayList lt String gt  list   new ArrayList lt  gt             Collections addAll list  items           int endOfList   list size            list add endOfList   This goes end of list            System out println Collections singletonList list      this is the  Compact  way of adding the item to the end of list  here is a safer way to do this  with null checking and more   String   items   new String    Hello    World            ArrayList lt String gt  list   new ArrayList lt  gt             Collections addAll list  items           addEndOfList list   Safer way            System out println Collections singletonList list      private static void addEndOfList List lt String gt  list  String item               try                  list add getEndOfList list   item                 catch  IndexOutOfBoundsException e                   System out println e toString                                 private static int getEndOfList List lt String gt  list           if list    null                return list size                      return -1          Heres another way to add items to the end of list  happy coding

User · Answer

import java util      public class matrixcecil       public static void main String args             List lt Integer gt  k1 new ArrayList lt Integer gt  10           k1 add 23           k1 add 10           k1 add 20           k1 add 24           int i 0          while k1 size   lt 10               if i   k1 get k1 size  -1                                 i k1 get k1 size  -1                k1 add 30                i                 break                    System out println k1              I think this example will help you for better solution

[java] How to append elements at the end of ArrayList in Java?

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