从arrayList

Question

我遇到了存储成员对象的arrayList问题。我认为这可能与我宣布它的方式有关。这就是我到目前为止所拥有的

会员类

package assignment;
import java.util.ArrayList;
public class Member {

private int memberID;
private String memberName;
private int memberAge;
private int numOfBooksLoaned;
private int penalties;

public Member(int memberID, String memberName, int memberAge, int numOfBooksLoaned, int penalties) {
    this.memberID = memberID;
    this.memberName = memberName;
    this.memberAge = memberAge;
    this.numOfBooksLoaned = numOfBooksLoaned;
    this.penalties = penalties;
}

public int getMemberID() {
        return memberID;
    }




    public void setMemberID(int memberID) {
        this.memberID = memberID;
    }




    public String getMemberName() {
        return memberName;
    }




    public void setMemberName(String memberName) {
        this.memberName = memberName;
    }




    public int getMemberAge() {
        return memberAge;
    }




    public void setMemberAge(int memberAge) {
        this.memberAge = memberAge;
    }




    public int getNumOfBooksLoaned() {
        return numOfBooksLoaned;
    }




    public void setNumOfBooksLoaned(int numOfBooksLoaned) {
        this.numOfBooksLoaned = numOfBooksLoaned;
    }




    public int getPenalties() {
        return penalties;
    }




    public void setPenalties(int penalties) {
        this.penalties = penalties;
    }




}

MemberList类

package assignment;
import java.util.Scanner;
import java.util.ArrayList;

public class MemberList {

private ArrayList<Member> Members;

    public MemberList(ArrayList<Member> Members)
    {
        this.Members = Members;
    }

    public void addNewMember()
    {

        Scanner input = new Scanner(System.in);
        boolean successful = false;
        int memberID;
        String memberName;
        int memberAge;

        do {

            System.out.println("/t/tCreate new member" + "/nPlease enter your full name: ");
            memberName = input.nextLine();
            for (int i = 0; i < Members.size(); i++) {
                if (Members.get(i).getMemberName().equalsIgnoreCase(memberName)) {
                    System.out.println("This member name is already in use");
                } else {
                    successful = true;
                }

            }

        } while (successful == false);

问题出在if语句

中的for循环之后

if (Members.get(i).getMemberName().equalsIgnoreCase(memberName))

错误表明类型getMemberName()未定义Member。 有什么想法吗？

我使用了完全相同的使用arrayList的相同方式，它工作正常，但由于某种原因它现在不起作用。

Answer 1

尝试以这种方式使用foreach循环

for (Member m : Members) {
    if (m.getMemberName().equalsIgnoreCase(memberName)) {
        System.out.println("This member name is already in use");
    } else {
        successful = true;
    }
}

另一件事是，不鼓励在Java中的类成员的第一个字母处使用大写字母，将列表定义为

private ArrayList<Member> members;