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

14 votes126 views1 answer
Formartted string java
Java
-1 vote104 views1 answer
What is treeset in java
Java
3 votes101 views1 answer
Java enum get nex
Java
0 vote104 views1 answer
Charat(0).touppercase() java
Java
0 vote107 views1 answer
Java get parent class
Java
2 votes66 views3 answers
Format money java
Java
1 vote105 views2 answers
Android java navigation bar show icon with title
Java
0 vote95 views1 answer
Draaiom
Java
1 vote115 views2 answers
How to remove all special characters from a string in java
Java