given
char[] arr = {'a','a','c','d','d','d','d'};
i want to print like this
{a=2,c=1,d=4} using java 8 streams.
using this :
Stream.of(arr).collect(Collectors.groupingBy(Function.identity(),Collectors.counting()))
but its not working.
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2 Answers
The method is Stream.of(char[]) returns a Stream where each element is an array of char, you want a stream of char, there is several methods here
char[] arr = {'a', 'a', 'c', 'd', 'd', 'd', 'd'};
Map<Character, Long> result = IntStream.range(0, arr.length).mapToObj(i -> arr[i])
.collect(Collectors.groupingBy(Function.identity(), Collectors.counting()));
System.out.println(result); // {a=2, c=1, d=4}
Comments
public class CharFrequencyCheck {
public static void main(String[] args) {
Stream<Character> charArray = Stream.of('a', 'a', 'c', 'd', 'd', 'd', 'd');
Map<Character, Long> result1 = charArray.collect(Collectors.groupingBy(Function.identity(), Collectors.counting()));
System.out.println(result1);
}
} // this can be helpful as well :)