java迭代ArrayList的泛型类型<User>

Question

我正在尝试从arraylist获取值

我的用户类型bean类如下所示

class User{

      public String link;
      public String url;

     User(String l,String u){
           this.link=link;
           this.url=url;
      }
setters and getters below.. 

在这里，我试图用main编写一个类

public class ListClass{
      public static void main(String args[]){
            List<User> list = new ArrayList<User>();
            list.add(new User("link1","url1"));
            list.add(new User("link2","url2"));
            list.add(new User("link3","url3"));

            //here i want to iterate both links and urls one by one 

            Iterator it=list.iterator();
            // remaining the code to get both link1 and url1 ..
}

我需要输出为：

link1  url1
link2  url2
link3  url2

Answer 1

可以使用for in构造，而不是迭代器：

for (User u : list) {
  System.out.println(u.link + " " + u.url);
}

如果您确实想使用迭代器：

Iterator<User> it=list.iterator();
while (it.hasNext()) {
  User u = it.next();
  System.out.println(u.link + " " + u.url);
}

Answer 2

如果你坚持使用iTreator：

Iterator<User> it = list.iterator();
while(it.hasNext()) {
   /...
   it.next();
}

Answer 3

for (User u : list) {
   System.out.println(u.getLink() + "  " + u.getUrl());
}

Answer 4

正如其他用户所说，您可以使用enhanced ^{} statement。还考虑添加^ {< CD2>}实现^ {< CD3>}：

class User
{
    @Override public String toString()
    {
        return this.link + " " + this.url;
    }
}

这将使循环减少到：

for (User u: list)
{
    System.out.println(u);
}