Question

private ArrayList<SocialMediaAccount> socialMediaAccounts;

public void addSocialMediaAccount(String userID, String websiteName, String websiteURL, int activityLevel) 
{
    SocialMediaAccount object = new SocialMediaAccount(userID, websiteName, websiteURL, activityLevel);
    socialMediaAccounts.add(object);
}

我有这个ArrayList，我需要搜索特定的websiteName并返回与该对象关联的userID。迷茫很多，并希望得到一些帮助来开始解决这个问题。谢谢！

Answer 1

您可以浏览arraylist并检查websiteName是否与列表中存储的websiteName匹配，如下所示：

for(int i = 0; i < socialMediaAccounts.size(); i++)
    if(socialMediaAccounts.get(i).getWebSiteName().equals(the_website_you_arelooking_for){
    return socialMediaAccounts.get(i).getUserId
    }
}

Answer 2

我想这种方法可以解决你的问题。希望你在socialMediaAccount课程中有吸气剂。

public String getuserID(ArrayList<SocialMediaAccount> socialMediaAccounts,String websiteName){
 for(SocialMediaAccount s:socialMediaAccounts){  
    if( s.getWebsiteName().equalsIgnoreCase( websiteName)){
        return s.getUserID;
    } 
} 
return "no user found";
}

Answer 3

这应该有用。

//This method will return the userID associated with the given target websiteName.
//Insert it where you need it.
public String search(String targetWebsiteName){
    //loop through each account in your list.
    For(SocialMediaAccount acc: socialMediaAccounts){
      SocialMediaAccount tempObject = acc; 
       //check for websiteName
       if(tempObject.getWebsiteName().equals(targetWebsiteName)) return tempObject.getUserID();
    }
return null;
}


//Add these methods to your SocialMediaAccount class
class SocialMediaAccount{

       //Getters for object variables
       String getWebsiteName(){
            return websiteName;
       }

       String getUserID(){
           return userID;
       }
}

Answer 4

如果您的列表中有很多项目并且您正在进行大量搜索，那么使用网站名称作为密钥的HashMap会更快。

Answer 5

I think what you will want    

for (SocialMediaAccount socialMediaAccount: socialMediaAccounts) {
            if (socialMediaAccount.getwebsiteName() == your_website_search_name) {
                return socialMediaAccount.getId();
            }
        }
        return null;

在ArrayList中搜索字符串并返回另一个关联的字符串

5 个答案: