Detached Criteria query is a facility provide by Hibernate to write criteria queries in ?detached mode?, where hibernate session is not available. You can instantiate this class anywhere.
For it you have to import

org.hibernate.criterion.DetachedCriteria;

Here is a way to write DetchedCriteria -

DetachedCriteria query = DetachedCriteria.forClass(Employee.class);
query.add(Property.forName("name").eq("Ron"));

Next you can obtain criteria by passing any arbitrary session to getExecutableCriteria() as ?

employeeList = query.getExecutableCriteria(session).list();

Here is Example:-

package net.roseindia.main;

import java.util.*;
import net.roseindia.table.Employee;
import net.roseindia.util.HibernateUtil;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.criterion.DetachedCriteria;
import org.hibernate.criterion.Property;

public class DetachedCriteriaQuery {
    public static void main(String[] args) {
        DetachedCriteria query = DetachedCriteria.forClass(Employee.class);
        query.add(Property.forName("name").eq("Ron"));
        SessionFactory sessionFactory = HibernateUtil.getSessionFactory();
        Session session = sessionFactory.openSession();
        List<Employee> employeeList = new ArrayList<Employee>();
        employeeList = query.getExecutableCriteria(session).list();
        Iterator it = employeeList.iterator();
        while (it.hasNext()) {
            Employee employee = (Employee) it.next();
            System.out.println("Name : " + employee.getName());
            System.out.println("Salary : " + employee.getSalary());
            System.out.println("Date of Join : " + employee.getDateOfJoin());
        }
        session.close();

    }
}