List.stream() .distinct() 去重 List,字母大写方法

1.import java.util.Arrays;
import java.util.List;
import java.util.stream.Collectors;
public class hhhh {
  public static void main(String[] args) {
    // TODO Auto-generated method stub
    List<String> list = Arrays.asList("a", "b", "c", "d","d","a");
      System.out.println("原来的List：");
      for (String s : list) {
          System.out.print(s);
        }
      List<String> distList = list.stream().distinct().collect(Collectors.toList());
      System.out.println();
      System.out.println("去重后：");
      for (String s : distList) {
        System.out.print(s);
      }
      System.out.println();
    List<String> Upper = list.stream().map(String::toUpperCase).collect(Collectors.toList());
    System.out.println("大写后：");
    for(String s:Upper){
      System.out.print(s);
    }
    System.out.println(); //{A, B, C, D}
  }
}