我确实有一个用例，需要在模型层中附加一个带有version（name\u version）的字符串（name）。但这只适用于列表中重复的名称。
学生.java

private class Student{
        private String name;
        private String value;
}

测试.java

public class NewTes {
    public static void main(String[] args){

            Student s1 = new Student("xyz","a1");
            Student s2 = new Student("abc","a2");
            Student s3 = new Student("xyz","a3");
            List<String> l2 = new ArrayList<>();
            List<Student> l1 = new ArrayList<Student>();
            l1.add(s1);
            l1.add(s2);
            l1.add(s3);

            //Get only names from the list
            l1.stream().forEach(e -> l2.add(e.getName()));

            // Output is
            //{"xyz","abc","xyz"}

            //Finding only the duplicate ones
            Set<String> result = l2.stream().filter(i -> Collections.frequency(l2, i) > 1).collect(Collectors.toSet());

            //Output is
            //{"xyz"}

            //Not sure how to proceed from here
            l1.stream().map(e -> e.getName()).flatMap(x -> result.contains(x) ? Stream.of(x + ))

            //expected output
            //{"xyz_a1", "abc" , "xyz_a3"}
        }
}