Question

I’m just wondering how do I convert for( char c: str.toCharArray()) to a simplified loop. I tried

for(int i = 0; i <= str.length(); i++)
    {
        char[] c = str.toCharArray();

However it doesn’t seem to be working. Its a program to count the occurence of letters in a String. Btw this is not homework. Im just trying to practice to get back into the swing of things. Any guidance would be much appreciated. Full code.

String str = "this is my new string";
HashMap<Character, Integer> map = new HashMap<Character, Integer>();

    for(int i = 0; i <= str.length(); i++)
    {
        char[] c = str.toCharArray();
        if(!map.containsKey(c))
            map.put(c,1);
        else
        {
            int value = map.get(c);
            map.put(c, ++value);
        }
    }
    System.out.println(map);

Answer 1

Try the String#charAt() method:

for(int i = 0; i <= str.length(); i++) {
    char c = str.charAt(i);
    // ...
}