[PDF] CSE 2231 - Java Collections Framework





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CSE 2231 - BinaryTree

1 окт. 2020 г. Assembles in this a binary tree with root label root and subtrees left ... • OSU CSE Components API: BinaryTree. – http://cse.osu.edu/software ...



CSE 2231 - Binary Search Trees

21 сент. 2022 г. How Can This Work? • With the BinaryTree components there are no methods to ... OSU CSE. 53 r. Page 54. Inserting x. 21 September 2022. OSU CSE.



CSE 2231 - Heaps and Heapsort

binary tree but they are arranged without regard to the heap ordering. • How can we “heapify” it? 1 October 2020. OSU CSE. 34. Page 35. Pseudo-Contract.



CSE 2231 - Linked Data Structures I

binary tree?) is a. “collection” type. Page 4. What's Wrong With Arrays? • A Java util and includes many types similar to the. OSU CSE components. Page 6 ...



CSE 2231 - Java Collections Framework

14 апр. 2021 г. • Uses a balanced binary search tree as the Map representation. • Has ... OSU CSE components.set.Set<T>: void add(T x). Adds x to this. Aliases ...



A class of programming language mechanisms to facilitate multiple

binary search tree say Binary_Search_Tree body



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Bolt: Fast Inference for Random Forests

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CSE 2231 - BinaryTree

Oct 1 2020 The BinaryTree component family ... Standard extends. 1 October 2020. OSU CSE. 3. BinaryTree implements. BinaryTree1. Iterable extends ...



CSE 2231 - Binary Search Trees

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CSE 2231 - Heaps and Heapsort

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CSE 2231 - Linked Data Structures I

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CSE 2231 - Java Collections Framework

Java Collections Framework. 14 April 2021. OSU CSE to the OSU CSE components ... Uses a balanced binary search tree as the Set representation.



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mining tree-mining and graph mining as well as in the context of indexing XML data Dr. Rountev joined OSU-CSE in 2002 and recently earned an NSF CAREER ...



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THE DEPARTMENT OF COMPUTER SCIENCE & ENGINEERING. THE OHIO STATE UNIVERSITY. 395 DREESE LABS 2015 NEIL AVE. COLUMBUS OHIO 43210 http://cse.ohio-state.edu.



CSE 2231 - BinaryTree

1 October 2020 OSU CSE 6 BinaryTree implements BinaryTree1 Iterable extends There is really an abstract class as usual in the chain here but it is not shown because these slides describe the client view and a client needs only interface BinaryTreeand class BinaryTree1



Mathematical Binary Tree Notation - webcseohio-stateedu

7 June 2022 OSU CSE 2 Recursive Structure • A binary tree (type binary tree of T ) is either – the empty tree ( empty_tree ) which has no nodes at all; or – a non-empty tree which consists of: • A root node (type T ) • Two subtrees of the root each of which is a binary tree (type binary tree of T



CSE 2231 - Tree

27 February 2019 OSU CSE 1 Tree • The Tree component family allows you to manipulate values modeled as mathematical trees with any label type T (i e tree of T 27 February 2019 OSU CSE 2 Interfaces and Classes TreeKernel extends Standard extends 27 February 2019 OSU CSE 3 Tree implements Tree1 Iterable extends Interfaces and Classes TreeKernel



Linked Data Structures I: Singly-Linked Lists - webcseohio

1 October 2020 OSU CSE 5 This is part of the package java util and includes many types similar to the OSU CSE components Collection Terminology •Fixed size means the size/length of a collection is “inflexible” i e it is determined at initialization of the collection and cannot be incrementally adjusted



6331 - Algorithms CSE OSU Binary search trees

6331 - Algorithms CSE OSU Binary search trees 6331 - Algorithms CSE OSUBinary search trees Instructor: Anastasios Sidiropoulos T(n) = (n) since it outputs nelements Let d=O(1) be the time required to examine a node We arguethat T(n) (c+d)n+c for some constant c T(n) T(k) +T(n k 1) + d= ((c+d)k+ c) = (c+d)n+c ((c+d)(n k 1) + c) + d



A Formal Approach to Component-Based Software Engineering

Third Quarter: Tree and binary tree components and binary search trees; context-free grammars; tokenizing parsing and code generating components; sorting components and sorting algorithms Figure 1: Course Descriptions for the OSU Courses Second Semester: Principles of object-based software engineering including specification design



Searches related to osu cse components binary tree filetype:pdf

Recursive Structure A treeis made up of: A root node A string of zero or more child nodes of the root each of which is the root of its own tree Since a tree may contain other trees its structure is recursive Note: the following explanation of trees is adequate for present purposes but is not technically complete; details later Nodes ?

Java Collections Framework

14 April 2021OSU CSE1

Overview

The Java Collections Framework (JCF)

is a group of interfaces and classes similar to the OSU CSE components

The similarities will become clearly evident

from examples

See Java libraries package java.util

There are some important differences, too,

however, that deserve mention (at the end)

14 April 2021OSU CSE2

Overview of Interfaces

14 April 2021OSU CSE3

SetListQueue

Collection

Sorted-

Set

Sorted-

Map

Iterable

Deque

Navigable-

Set Map

Navigable-

Map

Overview of Interfaces

14 April 2021OSU CSE4

SetListQueue

Collection

Sorted-

Set

Sorted-

Map

Iterable

Deque

Navigable-

Set Map

Navigable-

Map

Note: Mapdoes not

extend Collection;

Overview of Interfaces

14 April 2021OSU CSE5

SetListQueue

Collection

Sorted-

Set

Sorted-

Map

Iterable

Deque

Navigable-

Set Map

Navigable-

Map

Iterableis in java.lang

(because of its intimate connection to for-each loops), but Iteratoris in java.util.

Overview of Interfaces

14 April 2021OSU CSE6

SetListQueue

Collection

Sorted-

Set

Sorted-

Map

Iterable

Deque

Navigable-

Set Map

Navigable-

Map

Subsequent slides

discuss only certain interfaces.

The CollectionInterface

Essentially a finite multisetof E

No direct/efficient way to ask how many

Two interesting methods to create arrays of

the elements

Many methods (including add, remove,

clear

14 April 2021OSU CSE7

The SetInterface

Essentially a finite set of E

No removeAnyor similar method, so you

must use iteratorto iterate over a Set

Recall (from Iterator

iterator is unspecified if the underlying collection is modified while the iteration is in progress [except using Iterator.remove

Many methods (including add, remove,

clear

14 April 2021OSU CSE8

The ListInterface

Essentially a string of E

Access by position (similar to Sequence

from OSU CSE components)

Many methods (including add, remove,

clear

Two interesting additional features:

SublistList

A special two-way ListIterator

14 April 2021OSU CSE9

The ListInterface

Essentially a string of E

Access by position (similar to Sequence

from OSU CSE components)

Many methods (including add, remove,

clear

Two interesting additional features:

SublistList

A special two-way ListIterator

14 April 2021OSU CSE10

How do you move forward

and backward through a List from OSU CSE components?

The QueueInterface

Essentially a string of E

Access at ends (similar to Queuefrom

OSU CSE components)

Here, addand removeare not

addis similar to enqueuefor OSU CSE Queue removeis similar to dequeue

Curious names for other methods, e.g.,

offer, peek, poll

14 April 2021OSU CSE11

The MapInterface

Essentially a finite set of (K,V)

with the function property

No removeAnyor similar method, so you

must use iterator(somewhat indirectly) to iterate over a Map

Many methods (including put, remove,

clear

Like List, a Map

elements

14 April 2021OSU CSE12

Views in the JCF

A viewsubcollection

Not a copyof some of the elements, but rather

that is

Views for Map:

Keys: Set keySet()

Values: Collection values()

Pairs: Set> entrySet()

14 April 2021OSU CSE13

Views in the JCF

A viewsubcollection

Not a copyof some of the elements, but rather

that is

Views for Map:

Keys: Set keySet()

Values: Collection values()

Pairs: Set> entrySet()

14 April 2021OSU CSE14

Map.Entryin the JCF is

very similar to Map.Pair in the OSU CSE components.

Example: Map m

14 April 2021OSU CSE15

CodeState

m = {("PB", 99), ("BK", 42), ("SA", 42)}

Sets =

m.keySet(); m = {("PB", 99), ("BK", 42), ("SA", 42)} s = {"SA", "BK", "PB"}

Example: Map m

14 April 2021OSU CSE16

CodeState

m = {("PB", 99), ("BK", 42), ("SA", 42)}

Sets =

m.keySet(); m = {("PB", 99), ("BK", 42), ("SA", 42)} s = {"SA", "BK", "PB"}

Note all the aliases here!

There is no problem in this case

because Stringis immutable, but consider the potential problems if it were not.

14 April 2021OSU CSE17

CodeState

m = {("PB", 99), ("BK", 42), ("SA", 42)}

Collectionc =

m.values(); m = {("PB", 99), ("BK", 42), ("SA", 42)} c = {42, 99, 42}

Example: Map m

14 April 2021OSU CSE18

CodeState

m = {("PB", 99), ("BK", 42)}

Set

Integer>>s =

m.entrySet(); m = {("PB", 99), ("BK", 42)} s = {("BK", 42), ("PB", 99)}

Example: Map m

A view is backed by the underlying

collection, which means that if the view is collection is also modified, and vice versa

See Javadocfor supported modifications

Be especially careful when iterating over a

view of a collection and trying to modify it

14 April 2021OSU CSE19

Example: List s

14 April 2021OSU CSE20

CodeState

s = <10,7, 4, 2> s.subList(1,3).clear(); s = <10, 2>

14 April 2021OSU CSE21

CodeState

m = {("PB", 99), ("BK", 42), ("SA", 42)} m.values().remove(42); m = {("PB", 99), ("SA", 42)}

Example: Map m

14 April 2021OSU CSE22

CodeState

m = {("PB", 99), ("BK", 42), ("SA", 42)} m.values().remove(42); m = {("PB", 99), ("SA", 42)}

Example: Map m

Because removefor

Collection(assuming it is

supported for m.values!) removes one copy, we do not know which pair remains in m.

Could removeCause Trouble?

The object (dynamic) type of

m.values()in the above code might be an implementation of Listor of Queue

But not of Set; why not?

Could the optionalremovemethod not

be supported by the object type of m.values()?

14 April 2021OSU CSE23

Could removeCause Trouble?

The object (dynamic) type of

m.values()in the above code might be an implementation of Listor of Queue

But not of Set; why not?

Could the optionalremovemethod not

be supported by the object type of m.values()?

14 April 2021OSU CSE24

Yes! But only when the backing Map does not support remove(). Otherwise, it is supported because the informal Javadoc for the valuesmethod says: removes the corresponding mapping from the map, via the Iterator.remove, Collection.remove, removeAll, retainAlland clearoperations. It does not support the addor addAll

Iterating Over a Map

Because Mapdoes notextend Iterable,

but Collection(hence Set) does extend Iterable, you can (only) iterate over a Mapusing one of its three views:

Keys: Set keySet()

Values: Collection values()

Pairs: Set> entrySet()

14 April 2021OSU CSE25

Overview of CollectionClasses

14 April 2021OSU CSE26

Collection

Iterable

Abstract-

Collection

There are no classes

that directly and fully implement

Collection.

Object

AbstractCollection

Has code for many methods (shared, and

possibly overridden, by all later implementations of Collection) : add remove clear

14 April 2021OSU CSE27

AbstractCollection

Has code for many methods (shared, and

possibly overridden, by all later implementations of Collection) : add remove clear

14 April 2021OSU CSE28

UnsupportedOperationException

Overview of SetClasses

14 April 2021OSU CSE29

Set

HashSet

AbstractSet

TreeSet

Collection

Iterable

Abstract-

Collection

Object

AbstractSet

Has code for these methods (shared, and

possibly overridden, by all later implementations of Set): equals hashCode removeAll

14 April 2021OSU CSE30

HashSet

Uses hashingin the Setrepresentation

Has code for these methods (overriding

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