Question

我有一个 Matchmaker 类，它初始化一个ArrayList来存储用户类的对象。

var dataset = [10,20,30,2,32,4,1];

    elements = d3.select("body").selectAll("p")
                .data(dataset)

    elements
           .enter()
           .append("p");

    elements.text(function(d){return(d);});

此循环的结果是：

    //Class which keeps user objects in its ArrayList called Database
    MatchMaker myData = new MatchMaker();

    //My user object
    user tempUser;

    ArrayList<String> emails = new ArrayList<String>();
    emails = JSONRead.read();

    //Create a user at every loop, initialized by a email (String):
    for (int i = 0; i < emails.size(); i++) {

        tempUser = new user(emails.get(i));
        myData.Database.add(tempUser);
        System.out.println("User at position " + i + ": " + myData.Database.get(i).get("Firstname"));
    }

在该循环之外，我尝试打印应该在我的ArrayList中的每个对象：

User at position 0: Luat
User at position 1: Pim

此循环的结果是：

    //Print out every user in my ArrayList
    for(int i = 0 ; i < myData.Database.size() ; i ++){
        System.out.println("User at position " + i + ": " +m yData.Database.get(i).get("Firstname"));
    }

这里有什么问题，似乎添加的最后一个对象在我的ArrayList中是重复的？如果我必须发布有关用户类的更多信息，请说明。

将多个对象添加到ArrayList会导致一个对象在ArrayList中重复多次

0 个答案: