Hi I'm working on Drools 3.06. I am not able to decipher the drl snippet you have posted. I'am not clear about the <b>'from collect'</b> Keywords. My problem statement is to get the number of occurance of a Student(Name =="Drools") in a collection. Please find below a small java snippet which is equivalent to what I'm tring to do. int count = 0; List<Student> nameList = getListofNames(); while(nameList.iterator().hasNext()) { Student student = (Student)nameList.iterator().next(); if(Student.getName.equals("Drools")) { count++; } } System.out.println("Occurance Count" + count); Edson Tirelli-3 wrote: > > Nope, if you want actual instances you must use "collect": > > when > context : Context(state == Context:START_UP) > list : ArrayList( size > 0 ) from collect( ClassName(varName =="value" ) > ) > then > // list has your matching ClassName objects > end > > []s > Edson > > > > 2007/6/1, Rajesh.Sachin10 <rajesh_sachin10(a)yahoo.co.in&gt;: >> >> >> Its possible to use 'exists' keyword to get the number of occurance? >> >> Eg: >> >> context : Context(state == Context:START_UP) exists ClassName(varName == >> "value") >> >> >> The ClassName is an Object array..... So to get the number of occurance >> of >> the "value" in varName, we have any method or keywords? >> -- >> View this message in context: >> http://www.nabble.com/Usage-of-%27exists%27-keyword-to-get-the-number-of-... >> Sent from the drools - user mailing list archive at Nabble.com. >> >> _______________________________________________ >> rules-users mailing list >> rules-users(a)lists.jboss.org >> https://lists.jboss.org/mailman/listinfo/rules-users >> > > > > -- > Edson Tirelli > Software Engineer - JBoss Rules Core Developer > Office: +55 11 3529-6000 > Mobile: +55 11 9287-5646 > JBoss, a division of Red Hat @ www.jboss.com > > _______________________________________________ > rules-users mailing list > rules-users(a)lists.jboss.org > https://lists.jboss.org/mailman/listinfo/rules-users > > Quoted from: http://www.nabble.com/Usage-of-%27exists%27-keyword-to-get-the-number-of-...