character frequency counter java code example
Example 1: get frequency of letters java
HashMap<Character, Integer> map = new HashMap<Character, Integer>();
String s = "aasjjikkk";
for (int i = 0; i < s.length(); i++) {
char c = s.charAt(i);
Integer val = map.get(c);
if (val != null) {
map.put(c, new Integer(val + 1));
}
else {
map.put(c, 1);
}
}
Example 2: frequency of letters in english java
Map<Character, Long> frequency =
str.chars()
.mapToObj(c -> (char)c)
.collect(Collectors.groupingBy(Function.identity(), Collectors.counting()));