如何在java中混洗FilteredList？

Question

当我想要洗牌时,FilteredList我得到一个java.lang.UnsupportedOperationException.

怎么办呢？

码:

FilteredList<Card> filteredData = 
    new FilteredList(ob, filterByOption(option.get("selectedCard"), option.get("chapter")));

if (option.get("cardOrder") == "shuffle") {
    filterCards=filteredData;
    FXCollections.shuffle(filterCards);
}

Answer 1

如文档中所述:

使用提供的谓词包装ObservableList并过滤其内容.ObservableList中的所有更改都会立即传播到FilteredList.

因此,您可以ObservableList改为替换基础源:

FXCollections.shuffle(ob);

例:

ObservableList<String> obsList = 
    FXCollections.observableArrayList("Amanda", "Bill", "Adam", "Albus", "Cicero");
FilteredList<String> fList = new FilteredList<>(obsList, s -> s.startsWith("A"));

System.out.println(fList);
FXCollections.shuffle(obsList);
System.out.println(fList);

输出:

[Amanda, Adam, Albus]
[Adam, Albus, Amanda]