Tagged Questions
1
vote
1answer
64 views
High School Java Class: Pong Project External Reviewer
Panelball class:
import java.awt.*;
import java.awt.event.KeyEvent;
import javax.swing.*;
public class Panelball extends JPanel implements Runnable {
private static final long ...
1
vote
1answer
50 views
Help creating a workable design?
I received the following feedback for my code:
"I still do not see a design here that will work.
It is a very bad idea to have the big switch and loop at this point. All you need in your main() ...
0
votes
1answer
43 views
2D Array: Retrieve the “Left” Item
I am creating a game that contains a Board and Pieces. The Board is basically a 2D array of Pieces. [Think smaller chess board]
One of the things that I want to accomplish is to be able to retrieve ...
2
votes
2answers
127 views
Calculating and displaying number statistics
I'm writing a program which takes individual int inputs from the user and then outputs some details on the numbers (average, min, max and how many).
Input.readInt() is a method I made which simply ...
3
votes
1answer
44 views
Code to find the proper index comparing 3 values for max one
I have an algorithm and the idea is to move over an array choosing as index the index of the neighboring cell that has the max value.
I.e.
if array[i + 1][j + 1] has the largest value among the 3 ...
2
votes
1answer
191 views
Ranking and sorting on Array/List
My apology, I am quite new to posting a question in this forum.
I had a task where I was supposed to write a solution to sort entries(Name, score - in an array/list) in order of score and generate ...
1
vote
0answers
166 views
App engine Java: Sum difference two arrays - How to improve performance?
I have a function in App Engine java where I compare two patterns stored in an int array.
Below is the code:
public static int patternMatch(int [] pattern1, int [] pattern2, int range) {
int ...
0
votes
1answer
63 views
help review array of object code [closed]
public class DoubleMatrix
{
private double[][] doubMatrix;
public DoubleMatrix(int row, int col)
{
if(row > 0 && col > 0)
{
makeDoubMatrix(row,col);
}
...
1
vote
2answers
63 views
Request for help to tidy up code involving arrays and loops
I posted the following code on here a few days ago:
public class Practical4_Assessed
{
public static void main(String[] args)
{
Random numberGenerator = new Random();
int[] ...
0
votes
2answers
72 views
add Matrix method review
package homework3;
public class DoubleMatrix
{
private double[][] doubMatrix;
public DoubleMatrix()
{
int row;
int col;
if(row > 0 && col > 0)
...
4
votes
1answer
162 views
Partitioning Array
Problem: Given a randomly ordered array of n-elements, partition the
elements into two subsets such that elements <=x are in one subset and
elements > x are in the other subset.
one way to do this ...
4
votes
3answers
111 views
Is my code dealing with the presented problem the right way?
I finished this program to print a 2D array, I got the right output, but I'm not sure if I did what was being asked in the problem below.
My code to deal with the presented problem:
package ...
4
votes
3answers
414 views
A simple array-based Stack class in Java, what are my mistakes?
I have created a simple array-based Stack class with some methods like the actual Stack in Java.
I am testing this for mistakes, but since I am learning Java and my tests may not be as comprehensive ...
4
votes
2answers
304 views
A simple ArrayList class in Java, what are my mistakes?
I have created a simple ArrayList with some methods from the actual ArrayList in Java.
I am testing this for mistakes, but I am learning Java and my tests maybe are not comprehensive. So I decided to ...
0
votes
1answer
183 views
Am I doing this right? Merging 2 ordered source arrays into one destination array
My instructions were:
Add a merge() method to the OrdArray class in the orderedArray.java
program (Listing 2.4) so that you can merge two ordered source arrays
into an ordered destination ...
4
votes
2answers
2k views
Reading a line from a text file and splitting its contents
I have this kind of file structure
MALE:FooBar:32
FEMALE:BarFoo:23
Where I would want to identify the gender and age of person, <Gender>:<Name>:<age>
try{
BufferedReader in = ...
4
votes
1answer
968 views
Java 2d array nested loops
Okay, So I have this method I made that searches a 2d array of user input column length and row length comprised of integers. The method is suppose to find 4 alike numbers in rows, columns, and both ...
1
vote
0answers
422 views
Android - get int array from database Cursor
I find this code quite ugly, but in fact, I don't see any finest way to achieve the goal.
private static final String TABLE_NAME = "table_name";
private static final String[] allNeededColumns = ...
0
votes
1answer
162 views
Java permutation function returns zero for some reason…? [closed]
The following code works in Python but seems to return zero in Java for some reason.
Can you point out any errors?
import java.util.ArrayList;
import javax.swing.JOptionPane;
public class Test {
...
5
votes
2answers
340 views
Find all single elements in an array
I am interested in printing all numbers that do not have a match in an array.
Example: 1,3,4,5,3,4,5,5,6 result 1,5,6
Please review my solution bellow. What would be a much better way for this? Any ...
1
vote
1answer
320 views
Java generics, convert nested list to array
I have to interface to some old code using nested arrays, so I have to convert my nested Lists to nested arrays. Any idea, suggestions, improvements are warmly welcomed.
public static <E> int ...
10
votes
8answers
12k views
Java function to read a CSV file
I have a java function that reads a csv and returns its content as a Vector<Vector<String>>.
The function seems to work as I need it, but my gut feeling says it could be better (never ...
3
votes
3answers
227 views
Missed lab, wondering how this bit of Java code could be improved anyway?
I'm not able to get feedback on this because I forgot about the lab due date, but I'd appreciate some critique anyway. It takes in a user specified number of points then finds the two points with the ...
5
votes
4answers
1k views
Getting the largest element in an array using recursion
Any suggestions on how to make this code more efficient?
import java.util.Scanner;
public class RecursionLargestInArray
{
public static void main (String[] args)
{
int max = -999;
...
4
votes
1answer
246 views
Merging two array of classes
I have this function that should merge two array of classes when id of array1 is equal to id of array2.
For simplicity I converted one array into an ArrayList so I can remove the occurrence merged ...
3
votes
2answers
937 views
Optimizing a Deal Or No Deal-style game in Java
could this code be more Efficient?
The Game Class
import java.util.List;
import java.util.Arrays;
import java.util.Collections;
public class Game {
private Case[] cases = new Case[26];
...
2
votes
1answer
347 views
Can anyone check my code?
Can anyone check this code of mine I want to improve it . give me suggestion or tips and tricks to make this code of mine more efficient
Here's my code, I want you guys to give me advices and tips ...
1
vote
2answers
367 views
Matrix bottom left to top right
Can someone please review this simple code for printing all paths in a matrix from bottom left to top right. If element is 1, it is a "wall" and you cannot take it.
Possible steps: up and right
...
1
vote
1answer
512 views
An efficient way to shuffle a JSON array in java? (reposted from SO)
This is my first question here so I hope I don't break the protocol too much :)
I originally posted this question in SO: ...
