Question

stringValue

有没有办法可以在java中创建一个计数器来计算分配给MembershipStat.RegMember和MembershipStat.CoPresident等的人数？基本上是告诉我有多少注册人等的方式

Answer 1

我认为没有包装右侧（或类似的）

的方法

ChaseW = add(MembershipStat.CoPresident);

其中add类似于

static int[] counters = new int[MembershipStat.values().length];

static MembershipStat add(MembershipStat stat) {
  counters[stat.ordinal]++;
  return stat;
}

如有必要，请删除

static MembershipStat remove(MembershipStat stat){
    counters[stat.ordinal]--;
    return stat;
}

Answer 2

我建议添加一个Member类来为您捕获此信息：

class Member {
    private static final EnumMap<MembershipStat, Integer> statusCount = new EnumMap<>(MembershipStat.class);
    private MembershipStat status;
    private String name;

    public Member(String name, MembershipStat status) {
        this.status = status;
        this.name = name;
        statusCount.put(status, getStatCount(status) + 1);
    }

    public static int getStatCount(MembershipStat status) {
        return statusCount.getOrDefault(status, 0);
    }
}

然后您可以将成员添加为：

Member mrLee = new Member("Peter Lee", MembershipStat.Secretary);

获取特定状态的计数：

Member.getCount(MembershipStat.Treasurer);

理想情况下，您还可以处理成员的状态更改：

public void changeStatus(MembershipStat status) {
    assert getStatCount(this.status) >= 1;
    statusCount.put(this.status, getStatCount(this.status) - 1);
    this.status = status;
    statusCount.put(this.status, getStatCount(this.status) + 1);
}

Answer 3

根据您的所有需求进行调整。

public int checkFor(MembershipStat[] ms, MembershipStat check){
    int x = 0;
    for(MembershipStat m : ms){
        if(m.equals(check))x++;
    }
    return x;
}

我不确定你是如何设置名单的，使用Map / HashMap设置可能是有益的。对于你的例子，它看起来有点像这样：

import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;


public class Test1 {
    enum MembershipStat {CoPresident, Secretary, Treasurer, RegMember,Sponser}
    public static void main (String[] args)
    {

        final int CoPresidents = 2;



        Map<String, MembershipStat> roster = new HashMap<String, MembershipStat>();
        roster.put("ChaseW", MembershipStat.CoPresident);
        roster.put("Saif", MembershipStat.CoPresident);
        roster.put("MrLee", MembershipStat.Sponser);
        roster.put("Rahil", MembershipStat.Secretary);
        roster.put("Donovon", MembershipStat.RegMember);
        roster.put("Armaan", MembershipStat.RegMember);
        roster.put("Elliot", MembershipStat.RegMember);
        roster.put("JacksonM", MembershipStat.Treasurer);
        roster.put("Cyrus", MembershipStat.RegMember);
        roster.put("Avery", MembershipStat.RegMember);
        roster.put("PeterM", MembershipStat.RegMember);
        roster.put("Mahdi", MembershipStat.RegMember);
        roster.put("GeorgeW", MembershipStat.RegMember);

        System.out.println(checkFor(roster, MembershipStat.RegMember));


    }
    public static int checkFor(Map<String, MembershipStat> roster, MembershipStat check){
        int x = 0;
        Iterator<MembershipStat> it = roster.values().iterator();
        while(it.hasNext()){
            MembershipStat y = it.next();
            System.out.println(y);
            if(y.equals(check))
                x++;
        }
        return x;
    }
}

随意使用并询问问题！：d

如何创建计数枚举类型的计数器？

3 个答案: