Java collection Type mismatch: cannot convert from TreeSet to SortedSet

Question

package collection;

import java.util.*;

public class SortedSet {

    public static void main(String[] args) {
        // TODO Auto-generated method stub

         SortedSet set = new TreeSet();

    }

}

It giving me following error:

Type mismatch: cannot convert from TreeSet to SortedSet

Answer 1

Your class name is also SortedSet , so it is hiding java.util.SortedSet . Either rename your class (the preferred option) or use the full name of the interface in your variable declaration.

Answer 2

你有两个选择： - 更改类的名称， - 将set的类型更改为TreeSet，如TreeSer set = new TreeSet（）;