小编use*_*338的帖子

这是我写的代码？

Set keys = map.keySet();
SortedSet s = new TreeSet(keys);

我得到的警告是:

warning: [unchecked] unchecked call to TreeSet(java.util.Collection<? extends E>) as a
         member of the raw type java.util.TreeSet

如何摆脱编译器警告？