How to replace existing value of ArrayList element in Java

Question

I am still quite new to Java programming and I am trying to update an existing value of an ArrayList by using this code   public static void main String   args         List lt String gt  list   new ArrayList lt String gt          list add   Zero         list add   One         list add   Two         list add   Three          list add  2   New        add at 2nd index      System out println list       I want to print New instead of Two but I got  Zero  One  New  Two  Three  as the result  and I still have Two  I want to print  Zero  One  New  Three   How can I do this  Thank You

User · Accepted Answer

Use the set method to replace the old value with a new one   list set  2   New

User · Answer

Use ArrayList set  list set 2   New

User · Answer

If you are unaware of the position to replace  use list iterator to find and replace element ListIterator set E e   ListIterator lt String gt  iterator   list listIterator    while  iterator hasNext           String next   iterator next         if  next equals  Two                 Replace element          iterator set  New

User · Answer

You must use   list remove indexYouWantToReplace     first   Your elements will become like this   zero  one  three   then add this   list add indexYouWantedToReplace  newElement    Your elements will become like this   zero  one  new  three

[java] How to replace existing value of ArrayList element in Java

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