Add alphabets to List Java

Question

I want create a list with alphabets with each alphabets for 5 times. I tried a code and it worked,

public class AlphabetsTest {
    public static void main(String[] args) {
        List<Character> alphabetList = new ArrayList<>();
        for (int i=0; i<3; i++){
            char chr='a';
            if (i==1)
                chr = 'b';
            if (i==2)
                chr = 'c';
            for (int j=0; j<5; j++){
                alphabetList.add(chr);
            }
        }
    }
}

But I would have to add multiple if conditions for more alphabets. Is there any better way to avoid it.

score 1 · Answer 1 · answered Apr 04 '20 at 11:22

1

You can use char loop as below,

List<Character> alphabetList = new ArrayList<>();
    for(char chr = 'a'; chr <= 'c'; chr++){
        for (int j=0; j<5; j++){
            alphabetList.add(chr);
    }
}

You may also want to use, Collections.nCopies to avoid inner loop,

for(char chr = 'a'; chr <= 'c'; chr++){
    alphabetList.addAll(Collections.nCopies(5, chr));
}

answered Apr 04 '20 at 11:22

Vikas

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Simply awesome. Second option option is like a champ. jus 2 lines of code. – Alex Apr 04 '20 at 11:32
One more help needed. What if I want 5 a, 10 b, 20 c. How can we manage this – Alex Apr 04 '20 at 11:39
You can create a Map with char and count and iterate over it with the above logic. – Vikas Apr 04 '20 at 11:47
I didn't get you. – Alex Apr 04 '20 at 11:52

Add alphabets to List Java

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