public class Demo02If {
public static void main(String[] args) {
List<Person> personList = new ArrayList<>();
personList.add(new Person("one", 10));
personList.add(new Person("two", 20));
personList.add(new Person("three", 30));
//这两的name值重复
personList.add(new Person("four", 40));
personList.add(new Person("four", 45));
personList.add(new Person("four", 45));
System.out.println("利用Collectors.toMap去重:");
//利用Collectors.toMap去重
personList.stream()
.collect(Collectors.toMap(Person::getName, Function.identity(), (oldValue, newValue) -> oldValue))
.values()
.stream()
.forEach(System.out::println); //打印
//根据name和age 相同时去重
ArrayList<Person> collect = personList.stream().collect(Collectors.collectingAndThen(Collectors.toCollection(() ->
new TreeSet<>(Comparator.comparing(o -> o.getName() + ";" + o.getAge()))), ArrayList::new));
System.out.println(collect);
}
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