java分组求语文得分和数学得分

假设有一个学生类Student，其中包含姓名、语文成绩和数学成绩三个属性，可以使用Java中的Stream API对学生集合进行分组和计算语文和数学成绩的总和。

示例代码如下：

import java.util.Arrays;
import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;

public class Main {
    public static void main(String[] args) {
        List<Student> students = Arrays.asList(
                new Student("小明", 80, 90),
                new Student("小红", 90, 85),
                new Student("小刚", 85, 95),
                new Student("小李", 75, 80),
                new Student("小张", 95, 90)
        );

        Map<String, List<Student>> groupBy = students.stream().collect(Collectors.groupingBy(Student::getName));
        groupBy.forEach((name, list) -> {
            int chineseScore = list.stream().mapToInt(Student::getChineseScore).sum();
            int mathScore = list.stream().mapToInt(Student::getMathScore).sum();
            System.out.println(name + "：语文总分为" + chineseScore + "，数学总分为" + mathScore);
        });
    }

    static class Student {
        private String name;
        private int chineseScore;
        private int mathScore;

        public Student(String name, int chineseScore, int mathScore) {
            this.name = name;
            this.chineseScore = chineseScore;
            this.mathScore = mathScore;
        }

        public String getName() {
            return name;
        }

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

        public int getChineseScore() {
            return chineseScore;
        }

        public void setChineseScore(int chineseScore) {
            this.chineseScore = chineseScore;
        }

        public int getMathScore() {
            return mathScore;
        }

        public void setMathScore(int mathScore) {
            this.mathScore = mathScore;
        }
    }
}

输出结果为：

小张：语文总分为95，数学总分为90
小明：语文总分为80，数学总分为90
小李：语文总分为75，数学总分为80
小红：语文总分为90，数学总分为85
小刚：语文总分为85，数学总分为95