Question

我有这个传教士：

 ArrayList<HashMap<String, String>> contactListad

它包含：

[{emailAddress=samir, lastName=samir, contactId=4, phoneNumber=6449494, firstName=samir, homeAddress=paris}, {emailAddress=, lastName=, contactId=6, phoneNumber=, firstName=Rashad, homeAddress=las vegas}, {emailAddress=, lastName=, contactId=9, phoneNumber=, firstName=joe, homeAddress=paris}]

我的问题是，如果我如何获取值并将它们存储在另一个arraylist中我想指定只存储具有某个homeAddress的值等于paris。我希望我的问题很清楚

例如，如果我指定homeAddress为paris，我希望输出为包含

的arraylist

[{emailAddress=samir, lastName=samir, contactId=4, phoneNumber=6449494, firstName=samir,     
homeAddress=paris},{emailAddress=, lastName=, contactId=9, phoneNumber=, firstName=joe,    
homeAddress=paris}]

所以没有hasmap的homeAddress等于拉斯维加斯

谢谢

Answer 1

List<HashMap<String,String>> newArray = new ArrayList<HashMap<String, String>>();

for(HashMap<String, String> hm : contactListad){
    String val = hm.get("homeAddress");
    if("paris".equals(val)){
        newArray.add(hm);
    }

}

现在你在newArray

中拥有了你想要的东西

Answer 2

    for(HashMap<String, String> hashMap : contactListad) {
        String homeAdress = hashMap.get("homeAdress");
        if (homeAdress.equals("Paris")) {
            //write your code here
        }
    }

从ArrayList <hashmap <string，string =“”>＆gt; </hashmap <string，>中检索某些值

2 个答案: