java怎么筛选list中相同的值和筛选不同的值

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代码如下：

public class People {    private String id;    private String somethingElse;    public People() {    }    public People(String id, String somethingElse) {        this.id = id;        this.somethingElse = somethingElse;    }    public String getId() {        return id;    }    public void setId(String id) {        this.id = id;    }    public String getSomethingElse() {        return somethingElse;    }    public void setSomethingElse(String somethingElse) {        this.somethingElse = somethingElse;    }    @Override    public String toString() {        return "People{" +                "id='" + id + '\'' +                ", somethingElse='" + somethingElse + '\'' +                '}';    }}

people实体类和student实体类
People类

studentpublic class Student {    private String id;    private String idCard;    private String somethingElse;    public Student() {    }    public Student(String id, String idCard, String somethingElse) {        this.id = id;        this.idCard = idCard;        this.somethingElse = somethingElse;    }    public String getId() {        return id;    }    public void setId(String id) {        this.id = id;    }    public String getIdCard() {        return idCard;    }    public void setIdCard(String idCard) {        this.idCard = idCard;    }    public String getSomethingElse() {        return somethingElse;    }    public void setSomethingElse(String somethingElse) {        this.somethingElse = somethingElse;    }    @Override    public String toString() {        return "Student{" +                "id='" + id + '\'' +                ", idCard='" + idCard + '\'' +                ", somethingElse='" + somethingElse + '\'' +                '}';    }}

测试类

public static void main(String[] args) throws Exception{//初始化数据        List studentList = new ArrayList(){{               add(new Student("1", "11", "111")) ;               add(new Student("2", "22", "222"));               add(new Student("3", "33", "333"));        }};        List peopleList = new ArrayList(){            {                add(new People("11", "111"));                add(new People("222", "222"));                add(new People("33", "333"));        }};        //获取相同字段内容，转化为set        Set ids = peopleList                .stream()                .map(People::getId)                .collect(Collectors.toSet());//过滤重复内容        List result = studentList                .stream()                .filter(e -> ids.contains(e.getIdCard()))                .collect(Collectors.toList());        System.out.println(result);         //获取相同字段内容，转化为set        Set ids = peopleList                .stream()                .map(People::getId)                .collect(Collectors.toSet());//过滤重复内容        List result = studentList                .stream()                .filter(e -> !ids.contains(e.getIdCard()))                .collect(Collectors.toList());        System.out.println(result);}

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