Question

我如何继续获取声明的数组中的所有数字，然后得到长度，即其中有多少个数，然后除以它以找到其中所有数字的平均值。

package students;
import java.util.ArrayList;

public class students {

private ArrayList<Integer> scores = new ArrayList<Integer>();

    private String name;
    private int testScore;

    public students(){
        name = null;
        testScore = 0;
    }

    public students(String s, int t){
        name = s;
        testScore = t;
    }

    public void addQuiz(int t){
        scores.add(t);
    }

    public void averageGrade(){
        //get all the scores in the array and divide by the amount for average grade
    }
}

Theres my code

Answer 1

从Java 8开始，有一种计算平均值的方法：

http://docs.oracle.com/javase/8/docs/api/java/util/DoubleSummaryStatistics.html#getAverage--

可以在此处找到相应的整数版本：

http://docs.oracle.com/javase/8/docs/api/java/util/IntSummaryStatistics.html#getAverage--

Answer 2

public void averageGrade() {

    int sum = 0;
    float average = 0.0f;


    for(int i = 0; i < scores.size(); i++)
        sum += scores.get(i);       // Compute total score

    average = (float)sum / scores.size();  // Compute average

    System.out.println(average);
}

从整数数组中获取所有数字？

2 个答案: