Better way to generate array of all letters in the alphabet

Question

Right now I\'m doing

for (char c = \'a\'; c <= \'z\'; c++) {
    alphabet[c - \'a\'] = c;
}

but is there a better way to do it? Similar

Answer 1

To get uppercase letters in addition to lower case letters, you could also do the following:

String alphabetWithUpper = "abcdefghijklmnopqrstuvwxyz" + "abcdefghijklmnopqrstuvwxyz".toUpperCase();
char[] letters = alphabetWithUpper.toCharArray();

Answer 2

If you are using Java 8

char[] charArray = IntStream.rangeClosed('A', 'Z')
    .mapToObj(c -> "" + (char) c).collect(Collectors.joining()).toCharArray();

Answer 3

with io.vavr

public static char[] alphanumericAlphabet() {
    return CharSeq
            .rangeClosed('0','9')
            .appendAll(CharSeq.rangeClosed('a','z'))
            .appendAll(CharSeq.rangeClosed('A','Z'))
            .toCharArray();
}

Answer 4

import java.util.*;
public class Experiments{


List uptoChar(int i){
       char c='a'; 
        List list = new LinkedList();
         for(;;) {
           list.add(c);
       if(list.size()==i){
             break;
           }
       c++;
            }
        return list;
      } 

    public static void main (String [] args) {

        Experiments experiments = new Experiments();
          System.out.println(experiments.uptoChar(26));
    } 

Answer 5

This is a fun Unicode solution.

char[] alpha = new char[26]
for(int i = 0; i < 26; i++){
    alpha[i] = (char)(97 + i)
}

This generates a lower-cased version of alphabet, if you want upper-cased, you can replace '97' with '65'.

Hope this helps.