Java 出现cannot be resolved to a type

package com.sysutil.util;

/* thishi duo zhu
*/
// dan zhshi 
import com.sysutil.util.*;
class Example
{
    public static void main(String[] args)
    { 
        DateTool datato = new DataTool();
        String stdd = DateTool.getDateTime();
        System.out.println(stdd);
    }
}

     DateTool datato = new DataTool();
日期类中所有成员方法都是static的。 new对象出现错误 ：

Exception in thread "main" java.lang.Error: Unresolved compilation problem:
DataTool cannot be resolved to a type

at com.sysutil.util.Example.main(Example.java:11)