Question

我正在创建一个创建类Student的程序。获取名称和总测验分数，添加测验分数，并获得平均测验分数。

public class Student
    {
        private final String name;
        private int totalQuizScore;

        public Student(String studentName, int initialScore) //Constructor Students name and total score
        {
            name = studentName;
            totalQuizScore = initialScore;
        }

        //returns the name of new Student
        public String getName()
        {
            return name;
        }

        //adds a quiz score to the total quiz scores
        public int addQuiz(int score)
        {
            totalQuizScore = totalQuizScore + score;
            return totalQuizScore;
        }

        //returns the total quiz score
        public int getTotalScore()
        {
            return totalQuizScore;
        } 


    }

这是我的主要

public class StudentGrade {

    public static void main(String[] args)
    {
        Student tim = new Student("Johnson, Tim", 0); //new Student with name Tim Johnson, Initial Score of 0;

        tim.getName(); //returns name

        tim.addQuiz(9); //add quiz score of 9
        tim.addQuiz(10); //add quiz score of 10
        tim.addQuiz(10); //add quiz score of 10

        tim.getTotalScore();//returns total of all the scores


        String name = tim.getName(); //save Student name to variable name
        int totalScore = tim.getTotalScore(); //save Student total quiz scores in variable totalScore


        System.out.println(name + " " + totalScore);

    }
}

我需要计算添加的quizes的平均分数。所以要做到这一点，我需要能够计算添加了多少个测验......这就是我遇到的一些问题。

Answer 1

创建一个变量count，每次调用addQuiz();

时，该变量都会递增

private int count; //initialize to 0 in constructor
public int addQuiz(int score)
{
    totalQuizScore = totalQuizScore + score;
    ++count;
    return totalQuizScore;
}

现在计算平均值是将totalQuizScore除以count的一个小问题。

Answer 2

我能想到的最简单的方法是添加（Student）quizCount和getQuizAverage()这样的方法，

private final String name;
private int totalQuizScore;
private int quizCount = 0;

public int addQuiz(int score) {
  totalQuizScore += score;
  quizCount++;
  return totalQuizScore;
}

public float getQuizAverage() {
  return ((float)totalQuizScore/quizCount);
}

我如何计算我使用过多少addQuiz并使用它来获得平均分数？

2 个答案: