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

0 vote217 views1 answer
Final vs static keyword in java
Java
6 votes195 views3 answers
Minecraft mod
Java
7 votes205 views3 answers
Sorting list in java
Java
7 votes218 views2 answers
Print list array
Java
21 votes210 views3 answers
Java terminal colors
Java
0 vote207 views1 answer
Java suppresswarnings unchecked
Java
0 vote208 views1 answer
Java pattern check
Java
0 vote232 views1 answer
How to create an indefilite loop in java
Java
2 votes209 views1 answer
Java number of days between dates
Java
0 vote211 views1 answer
Resultset previous
Java