java - Java 类中的硬编码 Java 列表

Question

我正在对对象 Student 的列表项进行一些测试，但是我更喜欢在 java 类对象中创建硬编码列表，然后从那里提取数据，而不是连接到数据库并在结果集中选择记录。然而，自从我这样做以来已经很长时间了，我想我没有准确地写下类(class)。

我希望每次调用此类或实例化它时都能返回硬编码列表。下面是类(class)。我需要一些帮助来设置硬编码列表。

学生类

public class Student {

    private int studentId;
    private String studentLastname;
    private String studentFirstName;
    private int studentAge;


    public Student() {

    }
    public Student(int studentId, String studentLastname,
            String studentFirstName, int studentAge) {

        this.studentId = studentId;
        this.studentLastname = studentLastname;
        this.studentFirstName = studentFirstName;
        this.studentAge = studentAge;
    }
    public int getStudentId() {
        return studentId;
    }
    public void setStudentId(int studentId) {
        this.studentId = studentId;
    }
    public String getStudentLastname() {
        return studentLastname;
    }
    public void setStudentLastname(String studentLastname) {
        this.studentLastname = studentLastname;
    }
    public String getStudentFirstName() {
        return studentFirstName;
    }
    public void setStudentFirstName(String studentFirstName) {
        this.studentFirstName = studentFirstName;
    }
    public int getStudentAge() {
        return studentAge;
    }
    public void setStudentAge(int studentAge) {
        this.studentAge = studentAge;
    }


}

数据

我想插入以下数据

 Student.add(1, "john","william", 20);
 Student.add(2, "bob","elis", 25);
 Student.add(3, "harry","potter", 19);
 Student.add(4, "micheal","louis", 20);
 Student.add(5, "smith","sobers", 30);

Answer 1

对此有很多选择。人们甚至可以建议使用依赖注入(inject)框架来指定“学生来源”的特定实现。然而，在最简单的情况下，它可能看起来像这些方法之一......

class StudentUtils
{
    public static List<Student> getDummyList(int n)
    {
        List<Student> list = new ArrayList<Student>();
        for (int i=0; i<n; i++)
        { 
            list.add(new Student(i, "Last"+i, "First"+i, 20+(i%10)));
        }
        return list;
    }

    public static List<Student> getDummyList()
    {
        List<Student> list = new ArrayList<Student>();
        list.add(new Student(0, "Foo", "Bar", 20));
        list.add(new Student(1, "Fee", "Bur", 30));
        list.add(new Student(2, "Faa", "Bir", 40));
        return list;
    }
}