Chapter 14
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This document discusses maps, concrete map implementations, retrieving values from maps by key, custom collection classes, and linked lists. It provides examples of how maps associate keys with values and how to retrieve values from a map using keys. It also describes linked lists as collections where each node is linked to the next and can be traversed in one or two directions, and explains the hierarchy of nodes in a linked list.
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when using microcontrollers is determining which pin package to use. Develop a MATLAB
function that requests input on whether to use an LQFP100, LQFP144, or LQFP176 pin package
and outputs the corresponding pin package. The MATLAB function should receive an input of 1,
2, or 3 to determine the respective pin package. Think of it as a label maker with a dial input. It
should be made sure that the full strings are returned and outputted to the console. Use a method
other than the switch/case or if/else structures in order to develop this solution (i.e. build a
matrix). Answer the following questions:
1) In this context, explain the terminology ‘map’.
2) What is a good way of storing such a map in MATLAB?
3) How would you change the function to use 0, 1, and 2 as inputs instead of 1, 2, and 3?
4) How does MATLAB differ from Python when using arrays / lists?
Solution
prompt = \'Enter values 1 for LQFP100 2 for LQFP144 and 3 for LQFP176 \';
c = {\'LQFP100\', \'LQFP144\', \'LQFP176\'};
x = input(prompt)
c(1,x)
A Map object is a data structure that allows you to retrieve values using a corresponding key.
Keys can be real numbers or character vectors and provide more flexibility for data access than
array indices, which must be positive integers. Values can be scalar or nonscalar arrays.
Construction
mapObj = containers.Map constructs an empty Map container mapObj.
mapObj = containers.Map(keySet,valueSet) constructs a Map that contains one or more values
and a unique key for each value.
mapObj = containers.Map(keySet,valueSet,\'UniformValues\',isUniform) specifies whether all
values must be uniform (either all scalars of the same data type, or all character vectors).
Possible values for isUniform are logical true (1) or false (0).
mapObj = containers.Map(\'KeyType\',kType,\'ValueType\',vType) constructs an empty Map
object and sets the KeyType and ValueType properties. The order of the key type and value type
argument pairs is not important, but both pairs are required.
Input Arguments
keySet
1-by-n array that specifies n unique keys for the map.
All keys in a Map object are real numeric values or all keys are character vectors. If n > 1 and the
keys are character vectors, keySet must be a cell array. The number of keys in keySet must equal
the number of values in valueSet.
valueSet
1-by-n array of any class that specifies n values for the map. The number of values in valueSet
must equal the number of keys in keySet.
\'UniformValues\'
Parameter character vector to use with the isUniform argument.
isUniform
Logical value that specifies whether all values are uniform. If isUniform is true (1), all values
must be scalars of the same data type, or all values must be character vectors. If isUniform is
false (0), then containers.Map sets the ValueType to \'any\'.
Default: true for empty Map objects, otherwise determined by the data types of values in
valueSet.
\'Key.
Chap09
The document discusses arrays in Java programming. It covers topics like declaring and initializing one-dimensional and multi-dimensional arrays, processing array data through loops and methods, and common operations on arrays like initialization, input, output, and finding maximum/minimum values. The document also discusses passing arrays as parameters to methods and using arrays to store objects.
Python - Data Collection
This document discusses using lists in Python to represent and manipulate collections of data. It provides examples of calculating statistics like mean, median, and standard deviation on lists of numbers. Functions are defined to get numbers from the user into a list, calculate the mean of a list, calculate the standard deviation of a list given the mean, and find the median of a sorted list. The document shows how lists can store complex objects like student records and be sorted. Lists allow programs to efficiently organize and analyze entire datasets.
Generics Collections
The document discusses generics in .NET and how they provide type safety and code reuse. It explains that generics allow defining methods and classes that can work with different data types. This is done by specifying type parameters that act as placeholders for the actual types. Some key generic concepts covered include generic methods, classes, interfaces, and common collection classes like List, Stack, Queue and how they allow storing and manipulating different types of data.
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This document discusses recurrence relations, time complexity, binary search algorithms, and space complexity. It provides examples and explanations of each topic. For recurrence relations, it explains that a recurrence relates a term to its predecessors and they are useful for counting problems. It then discusses time complexity by defining it as the total time required for an algorithm to execute and providing an example calculation. Finally, it introduces binary search, explaining that it has logarithmic time complexity and works on sorted data, then provides pseudocode to implement binary search.
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This document provides an overview of Java's collections framework. It introduces common data structures like lists, sets, maps and their implementations including ArrayList, LinkedList, HashSet, TreeSet and HashMap. It explains how iterators work and how to traverse collections. The key interfaces like Collection, List, Set and Map are described along with their common methods. Examples of using different collections and their performance characteristics are also provided.
Array and Pointers
An array consists of a set of objects (called its elements), all of which are of the same type and are arranged contiguously in memory. In general, only the array itself has a symbolic name, not its elements. Each element is identified by an index which denotes the position of the element in the array. The number of elements in an array is called its dimension. The dimension of an array is fixed and predetermined; it cannot be changed during program execution.
Arrays are suitable for representing composite data which consist of many similar, individual items. Examples include: a list of names, a table of world cities and their current temperatures, or the monthly transactions for a bank account.
A pointer is simply the address of an object in memory. Generally, objects can be accessed in two ways: directly by their symbolic name, or indirectly through a pointer. The act of getting to an object via a pointer to it, is called dereferencing the pointer. Pointer variables are defined to point to objects of a specific type so that when the pointer is dereferenced, a typed object is obtained.
Pointers are useful for creating dynamic objects during program execution. Unlike normal (global and local) objects which are allocated storage on the runtime stack, a dynamic object is allocated memory from a different storage area called the heap. Dynamic objects do not obey the normal scope rules.
Generic collection types in PLSQL
The document introduces generic collection types that can enrich the PLSQL programmer's toolkit by providing commonly used data structures like lists, maps, sets, trees, and graphs. It describes the current status of available collection types and utility packages that extend their functionality. Practical examples are provided for using lists, simple maps, hash maps, and base maps to represent ordered collections, key-value pairs, and interconnected elements in graphs. Developers are encouraged to try out these generic collection types and provide feedback to further improve the tools.
Collection in Java
The document describes several common Java collection interfaces and classes, including List, Set, Map, ArrayList, LinkedList, Stack, Vector, and HashSet. It provides details on what each interface/class is used for, how it stores and accesses elements, common operations and their time complexities, thread-safety guarantees, and other implementation notes. The document also contains sections with more in-depth explanations of the List and Set interfaces.
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Chapter 10
An array is an ordered collection that stores elements of the same type within a single variable name. Elements are accessed via an index number that starts at 0. Arrays can be declared with a type and size, then instantiated using new. Values are assigned using the index operator. The length property returns the number of elements in the array. Arrays are objects that are passed by reference, but intrinsic element types within arrays are passed by value.
Chapter 09
An interface defines a contract that classes implement by providing the interface's methods but allowing flexibility in how they are implemented. Interfaces cannot be instantiated and can define constants but not fields or method implementations. A class can implement multiple interfaces. The Debuggable interface defines displayStatus and displayError methods to allow classes like Ball and Wall to output debugging information even though they don't inherit from the same class. Interfaces are used when classes don't have an "is-a" relationship but share capabilities, and to allow multiple inheritance which Java doesn't normally support.
Chapter 08
This document discusses specialization and inheritance in object-oriented programming. It explains that specialized classes inherit properties and methods from a parent or base class, and that inheritance allows for code reuse by permitting new classes to derive from existing classes without reimplementing their functionality. The document also covers protected access, using the super keyword to call parent constructors, polymorphism which allows specialized objects to be treated as general types, and abstract base classes which define common properties for derived classes without being instantiated themselves.
Chapter 07
This document discusses object-oriented programming and classes. It covers refactoring classes to perform single tasks, setting an object's state with member variables, implementing methods for an object's behavior, encapsulating an object's responsibility, considerations for good program design, method overloading for optional arguments, overloading constructors, and an example of overloading the Ball and HWall classes.
Chapter 06
The document discusses event-driven programming concepts like event sources, listeners, and mouse events. It explains that event sources raise events that are responded to by event listeners. It provides an example of a MouseClick applet that draws ovals in response to mouse click events. It also covers using timers to raise events at intervals and implementing anonymous inner classes to listen for timer events.
Chapter 05
The document discusses different types of program control structures in code including branching, looping, and logical operators. It describes if, else-if, and switch statements for branching based on conditions. It also covers different loop structures like while, for, and do-while loops. Nested if statements and logical operators like AND, OR, and NOT are presented for combining conditional tests.
Chapter 04
Variables store values within methods and can change as the method processes data. There are different types of variables such as local variables, which only maintain their value within the block of code they are declared in. Operators are symbols that perform actions in a program, such as assignment (=), mathematical (+,-,*,/), and relational (<,>,==,!=) operators. Constants are variables designated with the final keyword that have a fixed value that cannot be changed.
Chapter 03
This document discusses key concepts of object-oriented programming including classes, interfaces, encapsulation, data hiding, delegation, fields, access modifiers, methods, constructors, static members, and the this keyword. It explains that classes define public interfaces and private implementations, and that encapsulation involves containing all class responsibilities. Fields hold class data, and access modifiers control visibility. Methods define behavior, and accessor/mutator methods are used to follow data hiding. Constructors initialize objects, and static members are shared among instances. The dot operator indicates class/object membership.
Chapter 02
This document provides an overview of key concepts in object-oriented programming and Java, including models, classes, objects, fields, methods, object relationships, and the steps to write a Java program. It explains that classes define types through their characteristics and behaviors, while objects are instances of classes. Fields define object properties and methods describe capabilities. The document also covers compiling Java code, types of Java programs, and basic analysis of a HelloWorld example program.
Chapter 01
The document summarizes the history and development of computers from ancient counting devices like the abacus to modern PCs. It discusses early inventions in the 19th century that helped develop basic computer components. During World War II, the first generation of computers was developed for code breaking and calculations. The second generation saw transistors replace vacuum tubes and software stored on punch cards. Integrated circuits led to smaller, more powerful third generation computers. The fourth generation saw affordable personal computers introduced. The document then defines computer hardware and software components.
13 java in oracle
This document provides an introduction and overview of using Java stored procedures in Oracle databases. It discusses the advantages of using Java over PL/SQL, how to create and load Java classes into the database, how to define call specifications for Java methods, debugging and resolving issues, and using tools like Loadjava and Toad. The document is intended to educate developers on Oracle's Java stored procedure capabilities.
Java tut1 Coderdojo Cahersiveen
This document provides an overview of the Java programming language. It discusses key features such as platform independence, object-oriented programming principles like inheritance and polymorphism, automatic memory management, and security features. It also covers basic Java concepts like primitive data types, variables, operators, flow control statements, methods, and classes.
My 3 min pitch pack
This document outlines a business proposal, beginning with introducing the person or company presenting the proposal and where they are based. It then describes the business problem or idea in bullet points, keeping it simple. The proposal discusses the solution to the problem and how the business model would make money, such as through marketing and sales. It provides an overview of potential financials and lays out a future action plan, including what has been done so far, next steps, required funding, and needed personnel.
Things to do
The document discusses development for a client. It focuses on creating a plan to build new features for the client's software while ensuring the changes don't disrupt existing functionality or the current user experience. The development needs to be done carefully and methodically to avoid introducing bugs or breaking the application.
House in order
The document provides information on funding and support available for starting a new business in Ireland. It lists various government grants and agencies that offer funding in multiple phases. These include Enterprise Ireland, local enterprise boards, and advice on setting up a business from Citizens Information. Contact details and website URLs are also included to find more information on applying for financial assistance when starting a new company.
Blank 10 all you need
This document outlines the key sections needed to create a business plan, including an overview of the problem and solution being addressed, the business model, marketing and sales strategies, competition, financial projections, and action plan. The sections are meant to clearly describe the business idea, how it solves customer needs, how it will generate revenue, potential competitors, forecasted finances, and next steps.
Goals
This document discusses the importance of goal-setting by outlining the key steps: having a clear vision, defining long-term goals that support your vision, and taking action through testing and reassessing your progress on a regular basis. It also includes several quotes emphasizing the importance of fundamentals, striving for perfection, and not placing limits on what you think you can achieve.
Idea's1 only
The document provides an overview of idea generation and creative thinking. It discusses that 95% of creativity comes from perspiration rather than inspiration, and that while only 5% of adults consider themselves creative, 95% of children aged 5-10 exhibit strong creativity. It also lists several famous entrepreneurs and their ages when founding influential companies, generally in their early 20s or 30s. The document then provides strategies for idea generation, such as brainstorming, researching trends and influences, and maintaining an ideas notebook.
New frontiers motivation
The document discusses motivation and success. It describes Abraham Maslow's hierarchy of needs and goals. It then discusses how success can be redefined as a long-term process of continual development and learning from setbacks and failures, rather than just the achievement of a single outcome. The key is to not give up and keep trying through change, plans, mentors, time management, breaking habits, and focusing on progress rather than just outcomes.
The only slides you need
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Chapter 14
- 1. Map Collections and Custom Collection Classes Chapter 14
- 2. 14 Maps An object that maps a key to a value Key maps to one value A map cannot have duplicate keys Often used to associate a short key with a longer value Example: Dictionary Example: Employee database using employee ID number
- 3. 14 Concrete Map Implementations TreeMap orders the keys. HashMap stores the keys in a hash table. HashMap class is generally preferred for its efficiency (speed) unless sorted keys are needed.
- 4. 14 Retrieving Values by Key Use the keys collection to retrieve the keys in a map. Iterator keyIterator = myMap.keySet().iterator(); Keys collection holds “key” objects. Must cast key values to the appropriate type Integer key = (Integer)keyIterator.next(); Retrieves the next key from keyIterator (collection of keys) then casts it to an Integer and assigns it to the variable key
- 5. 14 Custom Collection Classes Custom collections allow you to define the data storage method. Good way to understand how other collection classes work Think through issues involved in writing good generic classes
- 6. 14 Linked List A linked list is a type of collection, similar to a train. Each object or node is linked to the next object in the collection. Singly linked list Each node knows the node following it Can only be iterated in one direction Doubly linked list Each node knows the node preceding it and the node following it Can be iterated in both directions
- 7. 14 Linked List Hierarchy Head node points to next node in list Internal node “carries” an object (the value being stored) and points to next node in list Tail node signals end of the list