成績統計クラス

package com.xzy;

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

/**
 * 
 * @author xizhenyin          
 * 
 */
public class ScoreCaculator {
	/**
	 *  
	 */
	private List<Integer> ls;

	public ScoreCaculator() {
		ls = new ArrayList<Integer>();
	}

	// **************************
	//    
	// *************************
	public void addScore(int score) {
		ls.add(score);
	}

	// **************************
	//    
	// *************************

	public int getSumScore() {
		int sum = 0;
		for (Integer s : ls) {
			sum = sum + s;
		}
		return sum;
	}

	public int getAverage() {
		int sum = 0;
		for (Integer a : ls) {
			sum = sum + a;
		}
		return sum / ls.size();
	}

	public int getMaxScore() {
		int max = ls.get(0);
		for (int i = 0; i < ls.size(); i++) {

			if (ls.get(i) > max) {
				max = ls.get(i);
			}
		}
		return max;
	}

	public int getMinScore() {
        int min = ls.get(0);
		for (int i = 0; i < ls.size(); i++) {

			if (ls.get(i) < min) {
				min = ls.get(i);
			}
		}
		return min;
	}

}

public class StudentScore {
 
 public static void main(String[] args){
  ScoreCaculator scl = new ScoreCaculator();
  scl.addScore(89);
  scl.addScore(98);
  scl.addScore(100);
  scl.addScore(76);
  scl.addScore(70);
  scl.addScore(90);
  System.out.println(" "+scl.getSumScore());
  System.out.println(" "+scl.getAverage());
  System.out.println(" "+scl.getMaxScore());
  System.out.println(" "+scl.getMinScore());
 }
}