[20210323] Java Stream, Exception

[JuHyun419]

Java Stream

• int[] to Integer List

        List<Integer> list = Arrays.stream(nums)
                .boxed()
                .collect(Collectors.toList());

• List removeIf

// 빈도수 1 초과(2이상)
list.removeIf(i -> Collections.frequency(list, i) > 1);

• List sum()

list.stream().mapToInt(i -> i).sum();

Exception

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