Superclasses We did not discuss the classes Collection, KeyedCollection, SequenceableCollection, or ArrayedCollection in the last section, even though they were listed as forms of "collection" in the beginning of this chapter. These classes, along with such classes as Boolean, Magnitude, or Number, are what are known as abstract superclasses. Instances of abstract superclasses are seldom useful...

A short segment on Alice has been used in introductory programming classes. The intent was to introduce objects in an easily accessible way. In the third iteration of this approach a presentation was made on quality issues in dramatics. The students were instructed on how to make the video more entertaining. Although this may be accomplished in a class hour or less, the results were encouraging...

This study modeled the effects of hydraulic dredging on the lower Karun river in Ahvaz range to thevillage is Farsyan . using software 4.1 HEC-RAS, one-dimensional model of the flow field wassimulated . After entering the information into the model and its calibration based on the selected,design flow model was implemented to extract the water surface elevation levels and spreading areaswere me...