求大神，面向对象的方法

Question

这个题目不太会面向对象思想来写，求指导⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯

Answer 1

 class Class
{
private ArrayList<Student> students = new ArrayList<Student>();
public ArrayList<Student> getStudents()
{
return students;
}
public void setStudents(ArrayList<Student> value)
{
students = value;
}
private int 班级号;
public void set班级号(int value)
{
班级号=value;
}
public int get班级号()
{
return 班级号;
}
private String 班级名称;
public String get班级名称() ...
public void set班级名称(String value) ...
public Class(int id, String name)
{
班级名称=name;
班级号=id;
}
public String toString()
{
return 班级号.toString() + "," + 班级名称;
}
}

class Student
{
private Class _class;
public Class get_Class()
{
return _class;
}
public void set_Class(Class value)
{
_class = value;
}
private int 学号;
public int get学号()
{
return 学号;
}
public void set学号(int value)
{
value = 学号;
}
... //姓名 年龄等
}