lecture21 - Administrative Issues Introduction to Data...

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Introduction to Data Structures Lecture 21 Administrative Issues • Program 4 due tomorrow at 11pm • Final exam review tomorrow – Exam similar format to midterm – Open notes, Open book – Test is comprehensive • Covers material both before and after midterm • More details on coverage during review – BRING QUESTIONS! Exam scheduled for Monday, 6/23 at 8am-11am Data Structures • Organization and management of data is fundamental to programming Data structures are the ways that data can be organized and used • Many data structures have been developed • Examples – Arrays – Multidimensional Arrays Collections •A Collection is an object that stores other objects – Arrays ArrayList • Generic term, but most collections provide similar services – add, remove, retrieve, etc. – These services are the interface to the collection Collections • Two varieties of collections – Homogeneous • Every element in the collection is of the same type – Heterogeneous • A mixture of types can be stored in the collection ArrayList , for example, stores Object references – Polymorphism – Inheritance Collection Ordering • Some collections have a defined order – Arrays for example • Others are unordered – No element is “first” or “last”
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Collections • Some many choices! – Heterogeneous vs. Homogeneous – Ordered vs. Unordered – Arrays or ArrayList or something else? • What collection should be used? – Depends on the situation… – Each is a tool in your toolbox • Which loop to use? • Which sorting algorithm to use? One Data Structure, Different Implementations • Data structures can often be implemented in different ways • Just like problem solving – Same problem – Multiple solutions • Important to separate interface from implementation Typical Collection Interface • The interface describes the possible operations – Add an object – Remove an object – Look at an object – Find an object – Inspect all objects • The interface should remain constant • Hides details of implementation ADTs • ADT stands for Abstract Data Type – ADTs are data structures – Collection of data
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This note was uploaded on 04/15/2009 for the course ASTRONOMY 1000 taught by Professor Kim during the Spring '01 term at Yonsei University.

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lecture21 - Administrative Issues Introduction to Data...

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