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I have a source list of type ArrayList<ArrayList<String>>. I want to put all the strings from the source list into a destination list of type ArrayList<String>. How do I do this?

Example: 

sourceList = { {"a","b"}, {"c","b"} }
destinationList = { "a","b","c","d" }
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  • 4
    And your question is? Commented Jun 15, 2018 at 13:30
  • Can't get what you are asking? Commented Jun 15, 2018 at 13:33
  • Tell us what is your problem ... and also peace of code Commented Jun 15, 2018 at 13:33
  • 2
    @Vishali Neither can we Commented Jun 15, 2018 at 13:34

1 Answer 1

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2

You can use for-each and addAll():

for (ArrayList<String> subList : listOfLists) {
    listofStrings.addAll(subList);
}

See: https://docs.oracle.com/javase/8/docs/technotes/guides/language/foreach.html https://docs.oracle.com/javase/7/docs/api/java/util/List.html#addAll(java.util.Collection)

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3 Comments

This is arraylist.you are adding arraylist values.i want arrayofarrayList
If I use arrayofarrayList I am getting only last index in my arraylist
@Vishali, you need to post some of your code so that we can help you. Please edit your question and include the relevant code.

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