Map - counting with map

// counting how many letters int the string
String s = "alma mater";
Map<Character, Integer> countOfLetters = new HashMap<>();
for (char c: s.toCharArray()) {
    if (countOfLetters.containsKey(c)) {
        countOfLetters.put(c, countOfLetters.get(c) + 1);
    }
    else {
        countOfLetters.put(c, 1);
    }
}
System.out.println(countOfLetters); // { =1, a=3, r=1, t=1, e=1, l=1, m=2}
int numberOfM = countOfLetters.get('m'); // 2

Source: github.com

Similar codes

1 vote393 views1 answer
String in Java is immutable or not
Java
0 vote366 views1 answer
Java.lang.stackoverflowerror null onetomany
Java
1 vote344 views1 answer
Java get amount of enums
Java
20 votes341 views6 answers
Convert char to string java
Java
6 votes353 views3 answers
Picking a random string from string array java
Java
1 vote368 views1 answer
Online java code fixer
Java
0 vote346 views1 answer
Get ocurrences in array java
Java
1 vote355 views1 answer
How to write on top of equal sign in latex
Java
0 vote329 views1 answer
Racine carré java
Java
0 vote368 views1 answer
At com.android.okhttp.internal.huc.HttpURLConnectionImpl.getInputStream(HttpURLConnectionImpl.java:251)
Java