How to create an String ArrayList in Java with a repeating pattern

Question

How can I create a String ArrayList with a repeated group of strings like

"A", "B", "C", "A", "B", "C", "A", "B", "C", "A", "B", "C", ......

In Python I use

list = deque(["A","B","C"]*288) # 288 times "A","B","C"

you could create an empty ArrayList and add the Strings with a for loop — Stefan Rendevski
– Stefan Rendevski, Commented Jan 14, 2017 at 11:55

Mureinik · Accepted Answer · 2017-01-14 12:01:41Z

6

You could use an IntStream to create a range of 288 items, and then flatmap it to though three strings:

List<String> strings = IntStream.range(0, 288)
                                .boxed()
                                .flatMap(i -> Stream.of("A", "B", "C"))
                                .collect(Collectors.toList());

answered Jan 14, 2017 at 12:01

Mureinik

316k54 gold badges399 silver badges405 bronze badges

Sign up to request clarification or add additional context in comments.

Comments

Gareth Davis · Accepted Answer · 2017-01-14 12:24:43Z

3

Without complicating things, Use a simple for loop:

ArrayList<String> alphabets = new ArrayList<String>();

for (int i=0; i<288; i++) {
    alphabets.add("A");
    alphabets.add("B");
    alphabets.add("C");
}

edited Jan 14, 2017 at 12:24

Gareth Davis

28.1k12 gold badges77 silver badges107 bronze badges

answered Jan 14, 2017 at 11:57

Mustafa sabir

4,3801 gold badge23 silver badges30 bronze badges

Comments

shas · Accepted Answer · 2017-01-14 13:00:32Z

1

Try this

for (int i = 0; i < 288; i++) {
    arrayListName.add((3 * i), "A");
    arrayListName.add((3 * i + 1), "B");
    arrayListName.add((3 * i + 2), "C");
}

edited Jan 14, 2017 at 13:00

shas

7032 gold badges9 silver badges32 bronze badges

answered Jan 14, 2017 at 11:58

Rabih Melko

6810 bronze badges

Collectives™ on Stack Overflow

How to create an String ArrayList in Java with a repeating pattern

3 Answers 3

Comments

Comments

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

3 Answers 3

Comments

Comments

Comments

Your Answer

Sign up or log in

Post as a guest

Related