合并list对象相同的值累加

import java.util.ArrayList;
import java.util.List;

/**
 * @author QITM
 * @date 2020/4/6 13:08
 * @描述
 */
public class hantingdemo {
    public static void main(String[] args) {
        List<Student> students = new ArrayList<Student>();
        Student stu1 = new Student("20140101", "张三", 1, 20, 39);
        Student stu2 = new Student("20140102", "里斯", 1, 23, 88);
        Student stu3 = new Student("20140101", "张三", 1, 20, 26);
        Student stu4 = new Student("20140103", "王五", 1, 17, 57);
        Student stu5 = new Student("20140101", "张三", 1, 20, 99);
        students.add(stu1);
        students.add(stu2);
        students.add(stu3);
        students.add(stu4);
        students.add(stu5);
        ArrayList<Student> countList = new ArrayList<>();
        for (int i = 0; i < students.size(); i++) {
            String gsId = students.get(i).getStudentNo();
            int flag = 0;// 0为新增数据，1为增加count
            for (int j = 0; j < countList.size(); j++) {
                String gsId_ = countList.get(j).getStudentNo();

                if (gsId.equals(gsId_)) {
                    double sum =students.get(i).getScore()
                            +countList.get(j).getScore();
                    countList.get(j).setScore(sum);
                    flag = 1;
                    continue;
                }
            }
            if (flag == 0) {
                countList.add(students.get(i));
            }
        }
        for (Student student:
        countList ) {
            System.out.println(student);

        }
    }
}
class Student implements Comparable<Student>,Cloneable{
    private String studentNo;
    private String name;
    private int sex;
    private int age;
    private double score;

    public Student() {
        super();
        // TODO Auto-generated constructor stub
    }

    public Student(String studentNo, String name, int sex, int age, double score) {
        super();
        this.studentNo = studentNo;
        this.name = name;
        this.sex = sex;
        this.age = age;
        this.score = score;
    }

    public String getStudentNo() {
        return studentNo;
    }

    public void setStudentNo(String studentNo) {
        this.studentNo = studentNo;
    }

    public String getName() {
        return name;
    }

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

    public int getSex() {
        return sex;
    }

    public void setSex(int sex) {
        this.sex = sex;
    }

    public int getAge() {
        return age;
    }

    public void setAge(int age) {
        this.age = age;
    }

    public double getScore() {
        return score;
    }

    public void setScore(double score) {
        this.score = score;
    }

    @Override
    public String toString() {
        return "Student{" +
                "studentNo='" + studentNo + ''' +
                ", name='" + name + ''' +
                ", sex=" + sex +
                ", age=" + age +
                ", score=" + score +
                '}';
    }

    @Override
    public int compareTo(Student o) {
        if (o == null) {
            return 1;
        }
        if (o.getAge() == this.age && o.getName().equals(this.name)
                && o.getSex() == this.sex
                && o.getStudentNo().equals(this.studentNo)) {
            return 0;
        }

        return 1;
    }

    public boolean equals(Student o) {
        if (o == null) {
            return false;
        }
        if (this.compareTo(o) == 0) {
            return true;
        }
        return false;
    }

    public Student clone() {
        return this.clone();
    }
}

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