Java去重

在Java中对Javabean进行去重

		List personList = new ArrayList();
        personList.add(new Person("Tom", 8900, 10,"male", "New York"));
        personList.add(new Person("Jack", 7000, 20,"male", "Washington"));
        personList.add(new Person("Lily", 7800, 30,"female", "Washington"));
        personList.add(new Person("Anni", 8500, 40,"female", "New York"));
        personList.add(new Person("Owen", 9500, 25,"male", "New York"));
        personList.add(new Person("Alisa", 7900, 24,"female", "New York"));
        personList.add(new Person("Alisa", 8500, 24,"female", "New York"));

//		  方法一：根据name去重
        ArrayIter collect6 = personList.stream().collect(
                Collectors.collectingAndThen(Collectors.toCollection(
                        () -> new TreeSet<>(Comparator.comparing(o -> o.getName()))
                ), ArrayIter::new)
        );
        
        System.out.println(collect6);
        
//        方法二:
        TreeSet people = new TreeSet<>(Comparator.comparing(Person::getName));
        people.addAll(personList);
        ArrayList collect7 = new ArrayList<>(people);

        System.out.println(collect7);
        
//        方法三:使用hutool
        TreeSet set = CollectionUtil.toTreeSet(personList, Comparator.comparing(Person::getName));
        ArrayList collect8 = CollectionUtil.newArrayList(set);

        System.out.println(collect8);

在java中对list进行去重

 		ArrayList list = CollectionUtil.newArrayList(50, 20, 60, 79, 10, 50, 60, 100);
        List list1 = list.stream().distinct().collect(Collectors.toList());
        
        System.out.println(list1);