[Java] Java8 스트림( Stream )

List<String> list = new ArrayList<>();
        list.add("a9");
        list.add("a2");
        list.add("a1");
        list.add("b1");
        list.add("a8");
        list.add("a6");
        list.add("b2");
        list.add("a4");
        list
            .stream()
            .filter(i -> i.startsWith("a"))
            .map(String::toLowerCase)
            .sorted()
            .forEach(System.out::println);

결과 값

a1
a2
a4
a6
a8
a9

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