导入包是申明了详细路径为什么还是报错

package c;

import java.util.Vector;
import c.Vector;

public class Lx2 {
    public static void main(String[] args) {
        System.out.println("就这么干");
        java.util.Vector  v=new java.util.Vector();
        c.Vector c=new c.Vector();
    }
}