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 byte-code and run in a virtual machine (JVM) enabling a "write once, run anywhere" (WORA) methodology.

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6 views

implementation of remove method in simple linked list

I want to implement a remove method in my simple linked list : it removes a node in my list ... The implementation according to my teacher is like this : ...
-1
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0answers
6 views

Improving noob-written Java code

I've just begun programming Java and I'm working on the following code that deals with socket-based communications. Basically it connects to a client on port 8888: ...
3
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1answer
27 views

Counting occurrences of a word in a file

This gives me the output of how many times the word is in the file. (I will eventually want to enhance the program to output on what line of the file the word is.) ...
2
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2answers
20 views

SortedList implementation in Java

I've implemented a SortedList which takes in streams of floats and returns a median at any point. ...
0
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0answers
20 views

Finding Kth Permutation Sequence

I have written a program to display the kth permutation sequence of a string made up of letters 'O' and 'Z' . I tried optimizing it but my code have not passed test cases due to timeout issues.Looking ...
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0answers
10 views

Draw Octagonal Grid [on hold]

I have developed a program to draw Octagonal Grid. How do i write pseudo code for the same OCTAGON.java ...
4
votes
3answers
187 views

Using Enum to Handle String literals

I have a java component that was using a lot of string literals that I need to make comparisons on and return booleans based on these comparisons. In order to make the code more robust I externalized ...
1
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1answer
27 views

Reading a CSV file containing a dataset of 8×8 images

I am trying to implement a machine learning algorithm (k-nn for example). But before I attempt to do that I was hoping for some feedback on my current Main class, which essentially builds 8×8-pixel ...
0
votes
1answer
21 views

Array-based MinHeap implementation in Java

This is my implementation of MinHeap in Java. ...
1
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0answers
22 views

Student/Class App Java/MySQL

I posted a question about this code yesterday and have made several updates. I'd just like to know if there are any other major errors or spots for improvement. I have three MySQL tables: ...
-1
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0answers
26 views

Validating a database connection

I need to validate database connections in a separate function. Why is SonarQube plugin for Jenkins complaining about the open statement if I close it in the finally block? ...
0
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0answers
18 views

Checking if a 3D point is outside of a trapezoid

I have recently written if a 3D point is within a specified trapezoid. It does it by checking 3 different planes of the trapezoid. I place the relevant 2 coordinates from the 3D point into the current ...
2
votes
2answers
41 views

is my add method in binary search tree correct [on hold]

I want to implement code for inserting a new Node in a binary search tree in java so please check if my code is correct ,,, Here is my method : ...
1
vote
3answers
77 views

Logic for shuffling sliding puzzle

I'm working on a sliding puzzle, one little project as a hobby, and yesterday I thought that instead of working on an algorithm to figure out a solved puzzle, it would be easier to make an algorithm ...
2
votes
1answer
24 views

Fractional Knapsack

This is my solution to an assignment on the fractional Knapsack problem. I take as problem input the following pieces of information: The number of item types The total weight limit For each item ...
8
votes
2answers
362 views

Java Singly Linked List Implementation

I've implemented a singly linked list in Java as a practice exercise and would appreciate a review. LinkedList.java ...
2
votes
2answers
34 views

Java web scraping robots

I am developing application that goes through 2 websites and gets all the articles, but my code is identical in most parts, is there a way to optimize this code actually :/ (TL and DN are the naming ...
2
votes
1answer
18 views

Printing the minuend and subtrahend in a Minimum Difference algorithm

I have a Minimum Difference algorithm, and I wanted to expand on it by printing the actual elements that were subtracted. I'm just wanting to know if this is the best way to do it. ...
0
votes
1answer
30 views

Simplifying LZW compression & decompression

I have wrote code that takes an input file text that can be compressed, and should contain ascii values, and then a new file is created with an appended ".lzw" and that file can then be decompressed. ...
9
votes
3answers
616 views

Student/Class Project Java MySQL

I have a Java application that uses a few switch statements to get user information about students and classes. I have three MySQL tables: students ...
-3
votes
1answer
48 views

Reading a file byte by byte in Java [on hold]

I am currently using this: Path path = Paths.get("c:\test\test.txt"); byte[] all= Files.readAllBytes(path); The problem with this is that I have to load the ...
1
vote
2answers
79 views

Instantiating shapes using the Factory Design Pattern in Java

Trying to learn the factory design pattern, came up with some code based on a Shape Factory (found this example here). Is this the right way to implement the factory pattern? ...
0
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0answers
20 views

Java 8: effective usage of Optional and Function [on hold]

I've wrote the following constructor: ...
0
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0answers
15 views

Correct use of SettableListenableFuture?

For the code below, is there any advantage of returning the SettableListenableFuture rather than the ...
0
votes
0answers
22 views

Refactoring Java Method into smaller methods [on hold]

I have a Java application that uses a few switch statements to get user information about students and classes. I have three MySQL tables: students student_id | student_name | hometown classes ...
3
votes
2answers
37 views

Parallel integer Quicksort in Java

Now I have that parallel Quicksort for (primitive) integer arrays. ParallelIntQuicksort.java: ...
3
votes
1answer
178 views

Method to replace all spaces in a String with '%20'

Problem statement (extracted from cracking the coding interview): Write a method to replace all spaces in a string with'%20'. You may assume that the string has sufficient space at the end of the ...
-2
votes
0answers
12 views

Getting Non zero exit code error while submitting code [on hold]

Solution given below is giving NZEC on spoj online judge Summary of problem: In the question we are to find the number of possible path from s to t in a directed acyclic graph. My approach is take a ...
3
votes
0answers
53 views

Tic Tac Toe - Stage 2: console PvP + PvE + “EvE”

A while back I had opened this topic: Tic Tac Toe - Stage 1: console PvP I had to put that mini-project on hold due to exams, but I've started working on it again a couple of days ago. Now it's ...
3
votes
1answer
55 views

Faster QuickSort

I'm trying to make my QuickSort faster than it is and I have got no more ideas about how to make it more efficient for all types of arrays but mostly very big arrays. It uses random to create the ...
2
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0answers
27 views

Interface modelling for a journaling program in Java

My program's Journal consists of unique Pages identified by their Day. Within those pages ...
-3
votes
0answers
18 views

Merge code for text slide and text randomising when page is refreshed [on hold]

Hi i'm struggling to put two codes together what will randomize the information every time page is refreshed. Also while someone is one the page, i'm wanting the change to different text.. i need this ...
3
votes
1answer
41 views

Number-guessing game with betting

I'm really new to programming, currently following several tutorials and guidelines. After a couple of days of studying, I've learnt the basics of Java and conditionals and took on my first program. ...
0
votes
0answers
28 views
0
votes
1answer
37 views

Longest contiguous Increasing Subset in java

I have tried to come up with a solution to the longest increasing subsequence problem.Can this solution be optimized further? Example 1: Input: {5,4,3,7,8,9,11} Output: 3, 7, 8, 9, 11 Example 2: ...
-5
votes
0answers
20 views

What is a good way to fix my logic [on hold]

I have to write a code that converts infix to postfix. I am having trouble sorting out the logic to do so. Here is my current code: ...
2
votes
2answers
75 views

My spaceship is slow to explode after being hit by the asteroid

I am making a game for my computer science class. My professor's requirements are: Write a Processing program that draws a triangle in the middle of the window. Rotate the triangle when the left and ...
1
vote
1answer
29 views

Retrieving access token from SharedPreference

Here is code that retrieves an access token from SharedPreference. ...
4
votes
1answer
319 views

Time limit exceeded for java “insertion sort linked list”

I was working on LeetCode to practice myself with Java programming. I encountered a question about insertion sort a linked list. My code currently runs correctly, but it failed on an instance with ...
-1
votes
0answers
26 views

Data Migration in Java [closed]

I'm currently doing a small data migration. I need to connect to SAP to get some data, make some modification, and then insert it into our DB. I've written some java code which would help me ...
2
votes
0answers
33 views

Application for encrypting and decrypting files in Java - follow-up

(Everything needed for running the app is here.) I have refactored my previous version a bit. App.java: ...
2
votes
1answer
55 views
0
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0answers
8 views
5
votes
3answers
333 views

Parsing a complex number using regular expressions

Requirements were to create a constructor for a complex number, that receives a string. For example: \$3+5i\$. The regex extracts positive or negative numbers from the string with optional decimal. ...
1
vote
0answers
50 views

Email text parser

I am writing a parser to parse out the fields of an email message in the following format (note that I expect that the "To:" field could contain multiple lines, same with the "Subject:" field. ...
3
votes
2answers
46 views

Finding duplicates in given list of files

I implemented a simple tool to find duplicate files, by applying the following strategy: Take a list of files and return the sets of duplicates (set of sets) Implement a custom ...
5
votes
1answer
50 views

Given a monetary amount, calculate the equivalent change

I have written a program that takes in some amount of money, and prints the equivalent change (starting at hundred dollars, to fifty, to twenty, down the pennies). Here is the code: ...
1
vote
0answers
16 views

alternatives solutions to the problem of trying to find a substring within a string using Regular Expression

I'm new to Java and is trying to find a substring within a string using Regular Expression . Below is the code I have came up with. However, I was just wondering if there are any alternative ways to ...