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1. Top results related to what is a computer and its classification?

   • What is the capacity of a StringBuffer ? And What is its purpose and its effect?

     Top Answer

     Answered Nov 21, 2013 · 4 votes

     You should use the more recent StringBuilder class. It's essentially the same, but without synchronization.

     If you know beforehand the approximate size, it's more efficient to allocate the StringBuilder with a sufficient capacity. This way it doesn't need to resize itself during the operations.

     Note that unless you're using multiple operations to create long Strings, it won't really affect performance. A situation where defining the capacity might be useful is for example creating a String of 10,000 characters, 10 characters appended at a time. It would take 1000 append calls, and might require the internal char[] to be resized multiple times.

     However if you were to create a String of 10,000 characters with 2 appends, you might get only 2 resizings. This is unlikely an issue performance-wise.

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     1/5

   • What is a TrieMap and what is its advantages/disadvantages compared to a HashMap?

     Top Answer

     Answered Aug 01, 2016 · 59 votes

     A Scala TrieMap is a trie-based concurrent scalable map implementation. Unlike normal trie maps, a Scala TrieMap has an efficient, non-blocking, O(1) time snapshot operation (and a slightly optimized readOnlySnapshot) operation.

     Absolute performance of a TrieMap is slightly below the JDK8 ConcurrentHashMap, but the advantage is that it provides consistent iterators, something that concurrent data structures typically do not have. This means that you can capture all the elements in the trie at one point in time (performance numbers and analysis here). You should use the TrieMap if you need to capture all the elements at once (e.g. to list all its elements in the UI, or to consistently analyze them).

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     2/5

   • What is a specialization diagram and what is its use?

     Top Answer

     Answered Mar 24, 2012 · 1 votes

     Specialization is a part of class diagram. Generalization, specialization and inheritance: http://sourcemaking.com/uml/modeling-it-systems/structural-view/generalization-specialization-and-inheritance

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     3/5

   • What is a domain object and what is its purpose?

     Top Answer

     Answered Jun 20, 2020 · 4 votes

     Validation & stuff

     The validation within a domain object would be restricted only to the business rules that it encompasses. For example, when calling $student->isValid(), the domain object would see, if the name and surname has been set and whether they do not contain number in strange places (like, "Frederick William III" is perfectly valid, while improbable, name).

     That does not include data integrity checks (like checking whether student's email address has not already been registered, thus violating UNIQUE constraint). The data integrity is verified by mappers. If you are using PDO for persistence abstraction, then in case of integrity error it will throw an exception, which you can handle internally in the mapper and set an error state on the domain object which you were attempting to store.

     Identification of self

     The "identify themselves" is kinda murky description. I would assume that it would refer to such operation as comparing the objects (like: $studentA === $studentB to verify whether it's the same student).

     The reference thing

     recognize which [of their] references indicate aggregation and which ones indicate association

     This bit talks about interaction between domain objects. Like calling $course->addStudent($student); which would define some sort of relationship between a Course and a Student instance. I am bit rust on the UML front, but I think this would indicate that:

     • course contains an aggregation of students
     • student is associated to a course

     An simplified and kinda clumsy example, which illustrates all the issues that you were having would probably looks like this:

     $student = new Student;$studentMapper = new StudentMapper($pdo);-$student->setId(42);-if (!$studentMapper->fetch($student)) { // error , missing student return;}-// found the one with ID 42$course = new Course;$courseMapper = new CourseMapper($pdo);-$course->setId(31);-if (!courseMapper->fetch($course)) { // missing course return;}-$course->addStudent($student);-if ($course->isValid() && $student->isValid()) { // check if there are free spots in course // and student has prerequisites $courseMapper->store($course); $studentMapper->store($student);}-

     Whether there is course-student double booking gets checked, when mappers try to store the data.

     Note: you also might notice that this starts to smell like a case for transactions. That's one of the reasons why in large scale OOP codebases it is common to use Units of Work.

     Note nr.2: keep in mind that "domain object" and "domain object collection" are two separate things. Same goes for persistence of these entities. Kinda like described in this old post.

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     4/5

   • What is a Flowchart and its Types?

     Flowcharts are nothing but the graphical representation of the data or the algorithm for a better understanding of the code visually. It displays step-by-step solutions to a problem, algorithm, or process. It is a pictorial way of representing steps that are preferred by most beginner-level programmers to understand algorithms of computer science, thus it contributes to troubleshooting the issues in the algorithm. A flowchart is a picture of boxes that indicates the process flow sequentially. Since a flowchart is a pictorial representation of a process or algorithm, it’s easy to interpret and understand the process. To draw a flowchart, certain rules need to be followed which are followed by all professionals to draw a flowchart and are widely accepted all over the countries.

     What is FlowChart?

     A flowchart is a type of diagram that represents a workflow or process. A flowchart can also be defined as a diagrammatic representation of an algorithm, a step-by-step approach to solving a task.

     Flowchart symbols

     Different types of boxes are used to make flowcharts flowchart Symbols. All the different kinds of boxes are connected by arrow lines. Arrow lines are used...

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     5/5

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2. www.careerpower.in › school › computerWhat is Computer? Definition, Characteristics and Classification

   www.careerpower.in › school › computer

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   Jun 1, 2024 · What is Computer? Definition, Characteristics and Classification. A computer is an electronic device that can store, manipulate, and process data according to a set of instructions. Know more about the Computer and its Classification, Characteristics, Functionality.

3. People also ask

   How are computer systems classified?

   • The computer systems can be classified on the following basis: 1. On the basis of size. 2. On the basis of functionality. 3. On the basis of data handling. Classification on the basis of size Super computers : The super computers are the most high performing system.

   Classification of Computers - GeeksforGeeks

   www.geeksforgeeks.org/classification-of-computers/

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   How can a computer be classified based on its size and capacity?

   • A computer can be classified based on its size, capacity, and purpose. The following diagram illustrates different types of computers as per their size, capacity, and purpose. As per the size, a computer can be broadly classified as follows − Microcomputers, also known as personal computers (PCs), are a type of computer designed for individual use.

   Classification of Computers - Online Tutorials Library

   www.tutorialspoint.com/computer_fundamentals/classification_of_computers.htm

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   How are computers classified based on functionality?

   • Computers are categorized into four groups according to their external dimensions, internal capabilities, and external uses. Here is list of computers classified based on functionality: Among digital computers, supercomputers are the biggest, fastest, strongest, and priciest.

   Classification of Computers: By Size, Usage, Type and Purpose - Olivebo…

   www.oliveboard.in/blog/classification-of-computers/

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   How do you classify a supercomputer?

   • 1. On the basis of size. 2. On the basis of functionality. 3. On the basis of data handling. Classification on the basis of size Super computers : The super computers are the most high performing system. A supercomputer is a computer with a high level of performance compared to a general-purpose computer.

   Classification of Computers - GeeksforGeeks

   www.geeksforgeeks.org/classification-of-computers/

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4. www.geeksforgeeks.org › classification-of-computersClassification of Computers - GeeksforGeeks

   www.geeksforgeeks.org › classification-of-computers

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   Feb 27, 2023 · The computer systems can be classified on the following basis: 1. On the basis of size. 2. On the basis of functionality. 3. On the basis of data handling. Classification on the basis of size. Super computers : The super computers are the most high performing system.

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6. en.wikipedia.org › wiki › Classes_of_computersClasses of computers - Wikipedia

   en.wikipedia.org › wiki › Classes_of_computers

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   Computers can be classified, or typed, in many ways. Some common classifications of computers are given below. Classes by purpose. Classes of Computers. Microcomputers (personal computers) Microcomputers became the most common type of computer in the late 20th century.

7. www.britannica.com › technology › computerComputer | Definition, History, Operating Systems, & Facts

   www.britannica.com › technology › computer

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   Jul 4, 2024 · Douglas Engelbart. Yves Béhar. Son Masayoshi. Related Topics: artificial intelligence. computer memory. supercomputer. computer graphics. information technology. (Show more) Top Questions. What is a computer? Who invented the computer? What is the most powerful computer in the world? How do programming languages work? What can computers do?

   • A computer is a machine that can store and process information. Most computers rely on a binary system, which uses two variables, 0 and 1, to compl...
   • Many people throughout history are credited with developing early prototypes that led to the modern computer. During World War II, physicist John M...
   • As of November 2021 the most powerful computer in the world is the Japanese supercomputer Fugaku, developed by RIKEN and Fujitsu. It has been used...
   • Popular modern programming languages, such as JavaScript and Python, work through multiple forms of programming paradigms. Functional programming,...
   • The most powerful computers can perform extremely complex tasks, such as simulating nuclear weapon experiments and predicting the development of cl...
   • A computer’s ability to gain consciousness is a widely debated topic. Some argue that consciousness depends on self-awareness and the ability to th...
   • Computer artificial intelligence's impact on society is widely debated. Many argue that AI improves the quality of everyday life by doing routine a...

8. oer-studentresources.gesci.org › wp-contentClassification of Computers | INTRODUCTION TO COMPUTERS

   oer-studentresources.gesci.org › wp-content

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   Purpose. Functionality. Classification of computers according to physical size. Based on physical size computers can be classified into four main groups. Super computers. Mainframe computers. Minicomputers. Microcomputers. SUPERCOMPUTERS. Supercomputers are the fastest, largest, most expensive & also the most powerful computers available.

9. www.oliveboard.in › blog › classification-of-computersClassification of Computers: By Size, Usage, Type and Purpose

   www.oliveboard.in › blog › classification-of-computers

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   Jul 17, 2024 · Classification of Computers – Based on their Functionality and Sizes. Computers are categorized into four groups according to their external dimensions, internal capabilities, and external uses. Here is list of computers classified based on functionality: Supercomputer; Mainframe computer; Minicomputer; Microcomputer; Supercomputer

10. www.tutorialspoint.com › computer_fundamentalsClassification of Computers - Online Tutorials Library

    www.tutorialspoint.com › computer_fundamentals

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    Previous. Next. A computer can be classified based on its size, capacity, and purpose. The following diagram illustrates different types of computers as per their size, capacity, and purpose. Computer's classification based on Size. As per the size, a computer can be broadly classified as follows −. Micro Computer. Mini Computer. Mainframe Computer