CamelCase

CamelCase.java

import java.io.*;
import java.util.*;
import java.util.stream.Collectors;
import java.util.stream.IntStream;
import java.util.stream.Stream;

public class CamelCase {

    public static String camelCase(String word) {
        final String[] wordList = word.split("-");
        return Stream.of(Arrays.copyOfRange(wordList, 1, wordList.length)).map(w ->
                w.substring(0, 1).toUpperCase() + w.substring(1)
        ).reduce(wordList[0], (acc, val) -> acc + val);
    }

    public static void main(String[] args) {
        System.out.println(camelCase("aa-bb-cc"));
        System.out.println(camelCase("abc"));
        System.out.println(camelCase("ABC"));
        System.out.println(camelCase("A-bb-Ca"));

    }
}

저도 참고해서 조금더 짧게 다듬어 봤습니다.

public String cameCase(String input) {
    return Stream.of(input.split("-")).reduce((a, b) -> a + capitalize(b)).orElse("");
}

private String capitalize(String b) {
    return b.isEmpty() ? b : Character.toUpperCase(b.charAt(0)) + b.substring(1).toLowerCase();
}