java - 数组列表的问题

Question

我正在做一个项目，我认为数组列表会更好，而不是使用数组。我知道我需要声明数组列表及其方法，但我不太确定从哪里开始。有什么建议么？这是代码...

public class Student {

    private String name;
    private int[] tests;

    public Student() {
        this("");
    }

    public Student(String nm) {
        this(nm, 3);
    }

    public Student(String nm, int n) {
        name = nm;
        tests = new int[n];
        for (int i = 0; i < tests.length; i++) {
            tests[i] = 0;
        }
    }

    public Student(String nm, int[] t) {
        tests = new int[t.length];
    }

    public Student(Student s) {
        this(s.name, s.tests);
    }

    public int getNumberOfTests() {
        return tests.length;
    }

    public void setName(String nm) {
        name = nm;
    }

    public String getName() {
        return name;
    }

    public void setScore(int i, int score) {
        tests[i - 1] = score;
    }

    public int getScore(int i) {
        return tests[i - 1];
    }

    public int getAverage() {
        int sum = 0;
        for (int score : tests) {
            sum += score;
        }
        return sum / tests.length;
    }

    public int getHighScore() {
        int highScore = 0;
        for (int score : tests) {
            highScore = Math.max(highScore, score);
        }
        return highScore;
    }

    public String toString() {
        String str = "Name:    " + name + "\n";
        for (int i = 0; i < tests.length; i++) {
            str += "test " + (i + 1) + ":  " + tests[i] + "\n";
        }
        str += "Average: " + getAverage();
        return str;
    }

    public String validateData() {
        if (name.equals("")) {
            return "SORRY: name required";
        }
        for (int score : tests) {
            if (score < 0 || score > 100) {
                String str = "SORRY: must have " + 0 + " <= test score <= " + 100;
                return str;
            }
        }
        return null;
    }
}

Answer 1

I figured an array list would be better

也许吧。也许不会。这取决于。使用基于 ArrayList 的产品看起来您会受益吗？ API？

如果您的“列表”永远不会改变大小，并且您不需要在其中查找内容，那么数组也同样好。

I know I need to declare the array list and its methods, but I am not too sure where to go from there

您需要创建对 ArrayList 实例的引用。就这么简单

List<Integer> myList = new ArrayList<Integer>();

在你的类声明中。您不需要“声明其方法”。当您拥有对对象的引用时，您可以调用其方法。