本文演示根據物件屬性對List中的物件去重

新建實體類

public class Person {
	
	private String id;
	
	private String name;
	
	public Person(String id, String name) {
		this.id = id;
		this.name = name;
	}

	public String getId() {
		return id;
	}

	public void setId(String id) {
		this.id = id;
	}

	public String getName() {
		return name;
	}

	public void setName(String name) {
		this.name = name;
	}

}
 

根據Person物件的id屬性去重以及檢視結果：

public class MainTest {

	public static void main(String[] args) {
		List<Person> list = new ArrayList<Person>();
		Person p1 = new Person("1", "123");
		Person p2 = new Person("2", "123");
		Person p3 = new Person("1", "456");
		list.add(p1);
		list.add(p2);
		list.add(p3);

		List<Person> result = list.stream()
				.collect(Collectors.collectingAndThen(
						Collectors.toCollection(() -> new TreeSet<Person>            (Comparator.comparing(p -> p.getId()))),
						ArrayList::new));

		for (Person person : result) {
			System.out.println(person.getId() + " " + person.getName());
		}
	}

}
 

輸出結果：