ArrayList로 성적 테이블 만들기

package J_collection;

import java.util.ArrayList;

public class SemScore {

public static void main(String[] args) {
	
	/*
	 * 402호 모두의 국어, 영어, 수학, 사회, 과학, Oracle, Java 점수룰
	 * 0~100의 랜덤으로 생성해주시고, 아래와 같이 출력해주세요.
	 * 
	 * 이름		국어		영어		수학		사회		과학		Oracle	Java	합계		평균		석차
	 * 홍길동		90		90		90		90		90		90		90		630		90.00	1
	 * 홍길동		90		90		90		90		90		90		90		630		90.00	1
	 * 홍길동		90		90		90		90		90		90		90		630		90.00	1
	 * 홍길동		90		90		90		90		90		90		90		630		90.00	1
	 * 홍길동		90		90		90		90		90		90		90		630		90.00	1
	 * 과목합계	450		450		450		450		450		450		450
	 * 과목평균	90.00	90.00	90.00	90.00	90.00	90.00	90.00
	 */
	
	ArrayList<String> students = new ArrayList<>();
	students.add("강동환");
	students.add("조하영");
	students.add("조하영");
	students.add("조하영");
	students.add("조하영");
	students.add("조하영");
	students.add("조하영");
	students.add("조하영");
	students.add("조하영");
	students.add("조하영");
	students.add("조하영");
	students.add("조하영");
	students.add("조하영");
	students.add("조하영");
	students.add("조하영");
	students.add("조하영");
	students.add("조하영");
	students.add("조하영");
	students.add("조하영");
	students.add("조하영");
	students.add("조하영");
	students.add("조하영");
	students.add("조하영");
	students.add("조하영");
	students.add("조하영");
	
	
	ArrayList<String> subjects = new ArrayList<>();
	subjects.add("국어");
	subjects.add("영어");
	subjects.add("수학");
	subjects.add("사회");
	subjects.add("과학");
	subjects.add("Oracle");
	subjects.add("Java");
	
	ArrayList<ArrayList<Integer>> scores = new ArrayList<>();
	ArrayList<Integer> sums = new ArrayList<>();
	ArrayList<Double> avgs = new ArrayList<>();
	ArrayList<Integer> ranks = new ArrayList<>();
	ArrayList<Integer> subSums = new ArrayList<>();
	ArrayList<Double> subAvgs = new ArrayList<>();
	
	//랜덤 점수 넣기
	for(int i = 0; i < students.size(); i++){
		ArrayList<Integer> score = new ArrayList<>();
		for(int j = 0; j < subjects.size(); j++){
			score.add((int)(Math.random() * 101));
		}
		scores.add(score);
	}
	
	//총점, 평균 구하기
	for(int i = 0; i < scores.size(); i++){
		int sum = 0;
		for(int j = 0; j < scores.get(i).size(); j++){
			sum += scores.get(i).get(j);
		}
		sums.add(sum);
		avgs.add(Math.round((double)sum / scores.get(i).size() * 100) / 100.0);
	}
	
	//석차 구하기
	for(int i = 0; i < sums.size(); i++){
		ranks.add(1);
		for(int j = 0; j < sums.size(); j++){
			if(sums.get(i) < sums.get(j)){
				ranks.set(i, ranks.get(i) + 1);
			}
		}
	}
	
	// 석차순 정렬
	for(int i = 0; i < ranks.size(); i++){
		int min = i;
		for(int j = i + 1; j < ranks.size(); j++){
			if(ranks.get(j) < ranks.get(min)){
				min = j;
			}
		}
		String tempName = students.get(i);
		students.set(i, students.get(min));
		students.set(min, tempName);
		
		scores.set(min, scores.set(i, scores.get(min)));
		
		sums.set(min, sums.set(i, sums.get(min)));
		
		avgs.set(min, avgs.set(i, avgs.get(min)));
		
		ranks.set(min, ranks.set(i, ranks.get(min)));
	}
	
	//과목 합계, 평균 구하기
	for(int i = 0; i < subjects.size(); i++){
		int sum = 0;
		for(int j = 0; j < students.size(); j++){
			sum += scores.get(j).get(i);
		}
		subSums.add(sum);
		subAvgs.add(Math.round((double)sum / students.size() * 100) / 100.0);
	}
	
	//출력
	System.out.print("이름");
	for(int i = 0; i < subjects.size(); i++){
		System.out.print("\t" + subjects.get(i));
	}
	System.out.println("\t합계\t평균\t석차");
	for(int i = 0; i < scores.size(); i++){
		System.out.print(students.get(i));
		for(int j = 0; j < scores.get(i).size(); j++){
			System.out.print("\t" + scores.get(i).get(j));
		}
		System.out.println("\t" + sums.get(i) + "\t" + avgs.get(i) + "\t" + ranks.get(i));
	}
	System.out.print("과목합계");
	for(int i = 0; i < subjects.size(); i++){
		System.out.print("\t" + subSums.get(i));
	}
	System.out.print("\n과목평균");
	for(int i = 0; i < subjects.size(); i++){
		System.out.print("\t" + subAvgs.get(i));
	}
	System.out.println();
	
	

}

}