小编Ran*_* B.的帖子

下面是我困惑的4种方法,4种方法都在Teacher类中.我有一个学生班和老师班.在Teacher类中,声明的是ArrayList<Student> students实例变量.

如何解释我在下面给出的方法中看到的学生,它也被用作参数.我对Student searchStudent(在方法中)和Student student(在参数内)非常困惑.这只是为了ArrayList吗？如何理解一个类使用类名搜索另一个类的概念？

public Student searchStudent(Student student)
{
    //confuses me
    Student found = null;

    if (this.students.contains(student))
    {
        int index = this.students.indexOf(student);
        if (index != -1)
        {
            found = this.students.get(index);
        }
    }
    return found;
}

public Student searchStudent(int id)
{
    //confuses me
    Student beingSearched = new Student();
    beingSearched.setStudentId(id);
    return this.searchStudent(beingSearched);
}

public boolean addStudent(Student student)
{
    //confuses me
    boolean added = false;
    if (this.searchStudent(student) == null)
    {
        this.students.add(student);
        added = true;
    } …