Design of Large Programs
Design of Large Programs CS 351L
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This 4 page Class Notes was uploaded by Trent Dare on Wednesday September 23, 2015. The Class Notes belongs to CS 351L at University of New Mexico taught by Joel Castellanos in Fall. Since its upload, it has received 17 views. For similar materials see /class/212200/cs-351l-university-of-new-mexico in ComputerScienence at University of New Mexico.
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Date Created: 09/23/15
Java ArrayList CS 351 Design of Large Programs Instructor Joel Castellanos v email 39oelunmedu Web httpcsunmedu39oel Office Farris Engineering Center FEC room 321 Lab Instructor David Godinez email dgodinezcsunmedu vc 1282009 Java ArrayList 2 I An ArrayList is a resizablearray of object references in continuous memory I Each ArrayList instance has a capacity The capacity is the size of the array used to store the elements in the list I The capacity is always at least as large as the list size I As elements are added to an ArrayList its capacity grows automatically I Details of the growth policy are not specified beyond the fact that adding an element has constant amortized time cost ArrayList Constructors partial list I ArrayList Constructs an empty list with an initial capacity of ten I ArrayListint initialCapacity Constructs an empty list with the specified initial capacity I ArrayListltclassnamegtint initialCapacity n Constructs an empty list with the specified initial capacity I Allows the compiler to check that all adds and gets insert and return an object that subclasses classname Java ArrayList Methods partial list I addObject o Appends the specified element to the end of this list I addint index Object element Inserts the specified element at the specified position in this list I Object getint index Returns the element at the specified position in this list I clear Removes all elements from this list Java ArrayList Methods partial list I ensureCapacityint minCapacity Increases the capacity of this ArrayList instance if necessary to ensure that it can hold at least the number of elements specified by the minimum capacity argument in An application can increase the capacity of an ArrayList instance before adding a large number of elements This may reduce the amount of incremental reallocation Java ArrayList Methods partial list I boolean containsObject elem Returns true if this list contains the specified element Note this only checks equality of element references I int indexOfObject elem Searches for the first occurence of the given argument testing for equality using the equals method I int size I Object toArray ArrayList Access Add and Insert An ArrayList is a continuous block of memory The it element can be accessed in constant time E i39i F l I LAI BEITQ LinkedList Access and Insertion I A LinkedList is in general a disjoint set of memory I The it element can be accessed in On time
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