面试题描述:
统计一个数组中,重复字符出现的次数,并以关联数组的形式输出。
String[] arr = {"D","B","A","B","C","A","A","B","D","C","D","D"};
Map<String, Long> r =
Stream.of(arr).collect(
Collectors.groupingBy(Function.identity(), Collectors.counting())
);
System.out.println(r);
如果需要找出出现次数最多的字符串,可以使用如下代码: