Map과 List를 이용한 평균값 내기

package Test;

import java.util.ArrayList;

import java.util.HashMap;

import java.util.List;

import java.util.Map;

public class Exam01 {

    

    

    public static void main(String[] args) {

        

        int resultAvg1 = 0;

        int resultAvg2 = 0;

        int resultAvg3 = 0;

        

        List<Integer> grade1 = new ArrayList<Integer>();

        

        grade1.add(80);

        grade1.add(50);

        grade1.add(60);

        grade1.add(70);

        

        for(int j=1; j <= grade1.size(); j++) {

            resultAvg1 += grade1.get(grade1.size() - j);

        }

        

        int GradeAvg1 = resultAvg1 / grade1.size();

        

        List<Integer> Avg1 = new ArrayList<Integer>();

        

        Avg1.add(GradeAvg1);

        

        List<Integer> grade2 = new ArrayList<Integer>();

        

        grade2.add(10);

        grade2.add(50);

        grade2.add(40);

        grade2.add(50);

        

        for(int j=1; j <= grade2.size(); j++) {

            resultAvg2 += grade2.get(grade2.size() - j);

        }

        

        int GradeAvg2 = resultAvg2 / grade2.size();

        

        List<Integer> Avg2 = new ArrayList<Integer>();

        

        Avg2.add(GradeAvg2);

        

        

        

        List<Integer> grade3 = new ArrayList<Integer>();

            

        grade3.add(80);

        grade3.add(20);

        grade3.add(40);

        grade3.add(70);

        

        for(int j=1; j <= grade3.size(); j++) {

            resultAvg3 += grade3.get(grade3.size() - j);

        }

        

        int GradeAvg3 = resultAvg3 / grade3.size();

        

        List<Integer> Avg3 = new ArrayList<Integer>();

        

        Avg3.add(GradeAvg3);

        

        

        Map<String, List<Integer>> studentGrade =

                new HashMap<String, List<Integer>>( );

        studentGrade.put("둘리", Avg1);

        studentGrade.put("또치", Avg2);

        studentGrade.put("길동", Avg3);

        

//      System.out.printf("둘리의 평균 점수 : %s\n", studentGrade.get("둘리"));

        System.out.printf("둘리의 평균 점수 : %s\n", studentGrade.get("둘리").toString().substring(1, 3));

        System.out.printf("또치의 평균 점수 : %s\n", studentGrade.get("또치").toString().substring(1, 3));

        System.out.printf("길동의 평균 점수 : %s", studentGrade.get("길동").toString().substring(1, 3));

        

    }

}