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Results tagged with java
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user 127399
Java (not to be confused with JavaScript) is a class-based, object-oriented, strongly typed, reflective language and run-time environment (JRE). Java programs are compiled to bytecode and run in a virtual machine (JVM) enabling a "write once, run anywhere" (WORA) methodology.
-1
votes
Checks if all items are negative
Bitwise arithmetics are usually the fastest operations for a CPU (hopefully the Java compiler can optimize as such)
When predicate gains performance ? … - Stack Overflow
Java Stream anyMatch() Tutorial With Examples | kheri.net …
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2
votes
Java grouping based on date and counting
What made me stumble when reading
Your use-cases and problem description reads almost fluently and most of it sounds plausible.
Though I rarely found names or words from your narrative in your code. M …
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2
votes
Best data Structure for storing a phone keypad format
Also the current situation & given constraints (like only Java-7, minimum time to code, test requires a method, etc.) can heavily reduce solution space and justify design-decisions as rational. … keys pressed are translated to a letter-typed event
Design choices
Datastructures
You can use several datastructures like
accessed by a hash-value: Map
accessed by a (numerical) index: List or simple Java …
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2
votes
Does iterating through a large data set in a Map each time i click impact the performance?
Technical improvements
use albumMap.values() to get a Collection<Album> directly instantiated as list, which supports positional access get(index). So no need for array and filling loop. See Listing …
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4
votes
Accepted
TicTacToe implementation in Java
Naming & Readability
Choosen naming mostly conveys purpose (expressive) and follows conventions (camelCase).
Design & Structure
Very good design for a learner:
TicTacToe represents a game instanc …
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1
vote
Roman Numeral Conversion in Java
Technical
The local variable String str is never used eirhin method convert. So can be removed.
Since the map is not supposed to change, make it a static final field, initialized directly or in stat …
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5
votes
Determine if a String has a mirroring head and tail
Such a Palindrome & Java question was Check string for palindrome
Inspired by Palindrome checker
Inspired by one of the answers which was both concise and elegant:
public static boolean isPalindrome …
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7
votes
Accepted
Are two strings anagrams?
does not depend on class state (each execution is determined by parameters only)
boolean return signals a kind of test-function, that can be used in if-statments, etc.
areAnagrams tells what it does (Java-naming …
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3
votes
Accepted
ID generator class for my Repair Shop Software
First of all we should describe a user-story for your ID-generator. This description should contain use-cases (including examples), requirements, and related technical context.
Use-Story
As creator …
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3
votes
Accepted
Creating and listing a song collection
use existing collection implementations of Java, as ArrayList or at least wrap them
learn the advantages of Single Responsibility Principle (SRP)
Here some improvements on modelling and design:
use … summary information (aggregation)
use separate class for formatting (as everything UI related)
Monetary values
Monetary values (e.g. prices and costs) can be modeled in different, disputed ways in Java …
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3
votes
File System - OOP
In reference to the Java API there may be a name collision, because the class File is also used by Java inside package java.io. …
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6
votes
Program in JAVA to generate random alphanumeric string
See: Math.random() explanation
Variable names
Typical Java convention would name things using Camel-case. Also following Cleancode would put as much meaning into their names. …
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2
votes
DDD: interaction between 2 objects in a RPG-game
Domain-Driven (Game) Design
Naming and terminology of a game (and other applications) follows a convention (depending on its genre).
Objects are typically expressed by nouns (N) like: Health and Playe …
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1
vote
Accepted
Is it good way to user dao when assembling dto to entity or not?
Because it maps from object-oriented structures (expressed in Java classes) to relational data structures (expressed in database tables) and back. …
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