class User
{
    /**
     * Returns <code>true</code>, if the user is an administrator
     * otherwise <code>false</code>.
     * @return <code>true</code>, if the user is an administrator
     *          otherwise <code>false</code>.
     */ 
    public boolean isAdministrator()
    {
       // ToDo: Insert code that identifies 
       // ToDo: this User instance as an administrator. 
    }
}

   if u.isAdministrator()
   {
      // Do stuff.
   }

/**
 * Have all business rules  implement a common interface.
 * To see if a business rule is being followed call <code>isValid</code>().
 */
public interface BusinessRule
{
    /**
     * Returns <code>true</code>, if the <code>BusinessRule</code> conditions
     * are fulfilled, otherwise false.
     */
    public boolean isValid();
}

public class AccessAuthority1
implements BusinessRule
{
    boolean hasAuthority = false;
 
    public void setAdministrator(Administrator a)
    {
        hasAuthority = // Test a for authority.
    }
 
    public boolean isValid()
    {
        return hasAuthority;
    }
}
 
public class AccessAuthority2
implements BusinessRule
{
    Administrator a;
 
    public void setAdministrator(Administrator a)
    {
        this.a = a;
    }
 
    public boolean isValid()
    {
        return // Test a for authority.
    }
}

public class BusinessRule {
    boolean checkForAdminRules(Administrator a) {
        if (a.getSalary() < x) {
            return false;
        }
        if (a.getGrade().equals("x") {
           return false;
        }
        if (a.getQualification().equals("xx"){
           return false;
        } 
        return true;
    //underneath here I can have many other methods for all the other objects
    //that are governed by business rules 
    boolean checkAccessRules() {
        ...
    }
    //etc, etc
}