java - Reading a text file using Scanner and count every time each alphabet appear -

so have assignment array. asked use scanner read through text files , record occurrences of each alphabet , store them in table.

for example:

public class {  char[] alphabet = "abcdefghijklmnopqrstuvwxyz".tochararray();  public void displaytable () {         (int = 0; < alphabet.length; i++) {             system.out.println(alphabet[i] + ":  " + count);         }     } 

i don't know how construct method store occurrences of each alphabet.

it supposed like:

public void countoccurrences (scanner file) {      //code written here } 

if text file has line , line :

hello world

the method ignore integers or symbols , output char appeared in table.

d: 1 e: 1 h: 1 l: 3 o: 2 r: 1 w: 1 

i can't figure out myself , appreciated!

thanks, shy

simply use map. read inline comments more info.

map<character, integer> treemap = new treemap<character, integer>(); // initialize default value 0 characters (char = 'a'; <= 'z'; i++) {     treemap.put(i, 0); }  char[] alphabet = "hello world".tochararray();  (int = 0; < alphabet.length; i++) {     // make lower case     char ch = character.tolowercase(alphabet[i]);     // value , update 1     // check characters     if (treemap.containskey(ch)) {         treemap.put(ch, treemap.get(ch) + 1);     } }  // print count (char key : treemap.keyset()) {     int count = treemap.get(key);     if (count > 0) {         system.out.println(key + ":" + treemap.get(key));     } } 

output hello world ignore case

d:1 e:1 h:1 l:3 o:2 r:1 w:1 

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read file line line. iterate character of line , update occurrence in map.