Java Stream - 如何filter String流和映射到大写然后排序

import java.util.Arrays;

public class Main {

  public static void main(String[] args) throws Exception {
    Arrays.asList("a1", "a2", "b1", "c2", "c1")
    .stream()
    .filter(s -> s.startsWith("c"))
    .map(String::toUpperCase)
    .sorted()
    .forEach(System.out::println);
  }

}