java - 将 FastSet 转换为字符串数组

Question

我有一套： Set<String> tmpSet = FastSet.newInstance();

当我关注这个问题时：如何将 Set 转换为 String[]？

我也这样做： String[] strArrStrings = includeFeatureIds.toArray(new String[0]);

我有这个例外：

Exception: java.lang.IllegalArgumentException
Message: Error running script at location [component://order/webapp/ordermgr/WEB-INF/actions/entry/catalog/KeywordSearch.groovy]: java.lang.UnsupportedOperationException: Destination array too small
---- cause ---------------------------------------------------------------------
Exception: java.lang.UnsupportedOperationException
Message: Destination array too small
---- stack trace ---------------------------------------------------------------
java.lang.UnsupportedOperationException: Destination array too small
javolution.util.FastCollection.toArray(FastCollection.java:351)

所以现在，我必须编码为：

for (FastSet.Record r = tmpSet.head(), end = tmpSet.tail(); (r = r.getNext()) != end;) {
         // copy one by one element to String[]  
     }

我的问题：无论如何（或实用程序）将 FastSet 转换为 String[]？

感谢 ：-）

也可以看看：

• 快速设置

Answer 1

See FastCollection#toArray(T[])

Unlike standard Collection, this method does not try to resize the array

so you have to make the array the right size. Use

includeFeatureIds.toArray(new String[includeFeatureIds.size()])

instead of

includeFeatureIds.toArray(new String[0])