list去重，根據物件某個屬性、某幾個屬性去重

去除List中重複的String

List unique = list.stream().distinct().collect(Collectors.toList());

去除List中重複的物件

// Person 物件
public class Person {
    private String id;

    private String name;

    private String sex;

    <!--省略 get set-->
}

// 根據name去重
List<Person> unique = persons.stream().collect(
            collectingAndThen(
                    toCollection(() -> new
 
 TreeSet<>(comparing(Person::getName))), ArrayList::new)
);

// 根據name,sex兩個屬性去重
List<Person> unique = persons.stream().collect(
            collectingAndThen(
                    toCollection(() -> new TreeSet<>(Comparator.comparing(o -> o.getName() + ";" + o.getSex()))), ArrayList
 
::new)
);