stream流处理List对象集合去重

public class TestStream { //创建一个list对象包含student对象 根据id去重 private static List<Student> list = new ArrayList<>(); static { Student s1 = new Student("1", "老大"); Student s2 = new Student("1", "老二"); Student s3 = new Student("2", "老三"); list.add(s1); list.add(s2); list.add(s3); } public static void main(String[] args) { ArrayList<Student> collect1 = list.stream().collect(Collectors.collectingAndThen(Collectors.toCollection(() -> new TreeSet<>(Comparator.comparing(Student::getId))), ArrayList::new)); collect1.forEach(x-> System.out.println(x.getId()+"-"+x.getName())); } }