Question

我想我已经陷入了混乱。我在下面的两个addMember部分有老师和学生。出于我正在做的目的，他们必须在一个部分，但当有人想要添加学生或教师时，他们需要能够单独添加（所以一个电话可以选择添加）。但是我对arrayLists的了解并不是很好，因为你可以看到它并不是很好。任何帮助都非常需要和赞赏。

import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;



public class Committee {

    private String name;

    private List<Object> members;

    public Committee(String name) 
    {
        this.name = name;
        members = new ArrayList<Object>();
        List list = new ArrayList();
    }

    public void addMember(Student student, Teacher teacher) 
    {
        List members1 = new ArrayList();
        members1.add(student);
        System.out.println(members1);
        List members2 = new ArrayList();
        members2.add(teacher);
        System.out.println(members2);
    }

    public void printMembership() 
    {
        System.out.println("Membership of the " + name + " Committee ");
        Iterator<Object> it = members.iterator();
        while (it.hasNext()) 
        {
            Object member = it.next();
            System.out.println(members);
        }
    }
}

Answer 1

我不确定你想要达到什么目标，所以我会写两个解决方案：

您希望拥有一个列表的情况

interface Member {...}
class Student implements Member {...}
class Teacher implements Member {...}

public class Comittee {
    private list<Member> members;

    public void addMember(Member member) {
        members.add(member);
    }

    public void printMembership() {
        members.forEach(System.out::println);
    }
}

您希望拥有两个列表的情况

interface Member ...
class Student implements Member ...
class Teacher implements Member ...

public class Comittee {
    private list<Teacher> teachers;
    private list<Student> students;

    public void addMember(Student student, Teacher teacher) {
        students.add(student);
        teachers.add(teacher);
    }

    public void printMembership() {
        getAllMembers().forEach(System.out::println);
    }

    private void getAllMembers(): List<Member> {
        List<Member> allMembers = ArrayList<>(students.size() + teachers.size());
        allMembers.addAll(teachers);
        allMembers.addAll(students);
        return allMembers;
    }
}

使用arraylist创建输入

1 个答案: