java 将 ArrayList <String> 转换为 ArrayList<SelectItem>
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Convert ArrayList < String> to ArrayList<SelectItem>
提问by rym
I have an ArrayList<String>named listout, I want to convert it to an ArrayList<SelectItem>. How can I do that?
我有一个ArrayList<String>命名列表，我想将它转换为ArrayList<SelectItem>. 我怎样才能做到这一点？
PS: JSF's selectItem
PS：JSF的selectItem
回答by BalusC
Based on your question history, you're using JSF 2. In this case, it's good to know that <f:selectItem>and <f:selectItems>do not require a single or a collection of SelectItemobject(s) anymore. Just a plain vanilla Stringor even a Javabean is also perfectly fine.
根据您的问题历史，您使用的是 JSF 2。在这种情况下，很高兴知道这一点<f:selectItem>并且<f:selectItems>不再需要单个或一组SelectItem对象。只是一个普通的香草String甚至一个 Javabean 也非常好。
So,
所以，
private String selectedItem;
private List<String> availableItems;
// ...
with
和
<h:selectOneMenu value="#{bean.selectedItem}">
<f:selectItems value="#{bean.availableItems}" />
</h:selectOneMenu>
should work as good in JSF 2.
在 JSF 2 中应该也能正常工作。
Or, a collection of Javabeans, assuming that Foohas properties idand name.
或者，一组 Javabeans，假设Foo具有属性id和name.
private Foo selectedItem;
private List<Foo> availableItems;
// ...
with
和
<h:selectOneMenu value="#{bean.selectedItem}">
<f:selectItems value="#{bean.availableItems}" var="foo" itemValue="#{foo}" itemLabel="#{foo.name}" />
</h:selectOneMenu>
See also:
也可以看看：
回答by Sean Patrick Floyd
Assuming you mean JSF's SelectItem:
假设你的意思是 JSF 的SelectItem：
List<SelectItem> items = new ArrayList<SelectItem>(listout.size());
for(String value : listout){
items.add(new SelectItem(value));
}
return items;
回答by slaphappy
I don't know what SelectItemis, so I will suppose you have a method for converting a Stringto it, named createSelectItem().
我不知道是什么SelectItem，所以我假设您有一种将 a 转换String为它的方法，名为 createSelectItem()。
You have to iterate through the strings and fill another ArrayList:
您必须遍历字符串并填充另一个ArrayList：
ArrayList<SelectItem> out = new ArrayList<SelectItem>();
for(String str : listout) {
out.add(createSelectItem(str));
回答by u290629
Collection<SelectItem> result = Collections2.transform(
listout,
new Function<String, SelectItem>(){
@Override
public SelectItem apply(String s) {
return createSelectItem(s);
}
});
