java - 我如何让这个数组结束？

Question

嘿，所以我有这个硬件作业，我必须编写一个程序，允许用户输入学生姓名和成绩，并返回最高最低和平均水平。唯一的问题是类最多有 50 名学生(或者表格上说的)，而且上面只有 10 个学生的名字和成绩。我如何让数组在最后一个学生之后结束？

static final int MAX = 50;
public static void main(String[] args)
{
    int index, average;
    int highest = 0, student = 1;
    Scanner keyboard = new Scanner(System.in);
    String [] students = new String[MAX];
    int[] grades = new int[MAX];

    System.out.println("Please enter the name of the student and their test grade");
    System.out.print("Students: ");
    for(index=0; index<MAX; index++)
        {
            students[index] = keyboard.nextLine();
            student = student + index;
            if(students[index]=="Done"))
            {
                student = student - 1;
                continue;
            }

        }
    System.out.print("Grades: ");
    for(index=0; index<student; index++)
        grades[index] = keyboard.nextInt();
    averageMan(grades, student);
    for(index=0; index<student; index++)
        if(grades[index] < averageMan(grades, student))
            System.out.println(students[index] + " Your test grade was " +
                            "below the class average. Step it up.");
    for(index=0; index<student; index++)
        if(grades[index] > highest)
            highest = grades[index];
    System.out.println("The highest test grade in the class goes to " +
                    students[highest] + " with a grade of " + grades[highest]);
}

public static int averageMan(int[] g, int s)
{
    int index, sum = 0;
    int averages;
    for(index=0; index<s; index++)
        sum = sum + g[index];
    averages = sum / s;
    return averages;
}

Answer 1

使用集合，而不是数组。他们的 api 更有用。

阅读Collections Trail开始。

如果您想直接替换数组，use a List ，如果你想要唯一性，use a Set .