How To Determine Size Of Table
Jul 6, 2014Can be :
results = null;
results = new double[2];
results = new double[50];
results = new double[100];
How determine size of this table : System.out.println("table size=",???);
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Create 2D Array Out Of CSV File And Find Number Of Elements To Determine Array Size
Mar 24, 2015I am taking the Class Algorithms and Datastructures and got an assignment for Lab that really throws me off. The goal is to create an Array out of a given CSV file, implement several Methods that get the size of array, etc.
I am still stuck in the first part where the CSV has to be imported into the Array. My problem is that I need a mechanism that figures out the needed size for the Array, creates the array, and only then transfers the data from the CSV.
The list consists of the following wifi related values:
MAC-Adress, SSID, Timestamp, Signalstrength.
These are on the list, separated by comma. The Columns are each of these, and the rows are the four types of values making up the information on a certain wifi network.
The catch is, we are not allowed to use any of the following:
java.util.ArrayList
java.util.Arrays
and any class out of java.util.Collection.
So far I used the BufferedReader to read in the file and tried to implement the array, but I get an arrayindexoutofboundsexception.
Below is my Code (Its still an active construction zone):
public class WhatsThere {
public WhatsThere(String wifiscan) throws IOException {
}
public static void main(String[] args) throws IOException {
// WhatsThere Liste = new WhatsThere(String wifiscan);
String[][] arrayListe = new String[0][0];
[Code] ....
JavaFX 2.0 :: How To Define Cell In The Table By Table Event
Mar 23, 2015How to define Cell in the table by table event?
I need to process one component drag to the table. I misunderstand, how I can see to which Cell fall the component. I tried to use Event and Mouse event handlers in my custom Cell, but they do not work. I can copy the drag event to the table and table handles it, but how to get needed Cell I cant understand.
Adding Data In Table But The Table Is In Another Frame
Mar 13, 2014This is my codes in a button that if I click it . that information will send to Jtable but the problem is the jtable is in another frame so how can i connect this ?
DefaultTableModel model = (DefaultTableModel)
new admin().tableBagtags.getModel();
if (txtName.getText().equals("")) {
JOptionPane.showMessageDialog(null, "Please fill out all fields.", "Error!", JOptionPane.ERROR_MESSAGE);
[Code] .....
JSF :: Unable To Add Mysql Table Columns To Table
Apr 29, 2014I'm trying to add some mysql table columns to JSF table. And I'm getting error:
/index.xhtml: The class 'logon.User' does not have the property 'description'.
User.java
package logon;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.Table;
[Code]...
How To Determine Value After Nested For Loop
Oct 12, 2014int count = 0;
for (int x = 0; x < 3; x++)
for (int y = x; y < 3; y++)
for (int z = y; z < 3; z++)count++;
What is the value of count after the code segment is executed?
The answer is 9, but I don't really understand how this answer was derived.
How To Determine Value After Nested For Loop
Oct 12, 2014int count = 0;
for (int x = 0; x < 3; x++)
for (int y = x; y < 3; y++)
for (int z = y; z < 3; z++)
count++;
What is the value of count after the code segment is executed?
The answer is 9, but I don't really understand how this answer was derived.
Determine If Rectangles Cover Each Other
Oct 22, 2014[URL] .... This is a link to the credentials that need to be met.
/* Constructors, getters and setters that will determine if the rectangles cover each other.*/
import java.util.Random;
import java.lang.Math.*;
class Rectangle{
int width = 50;
int length = 50;
int x = 90;
int y = 90;
[Code] ....
JSP :: How To Determine Username (Website Visitor)
Jul 17, 2014Is there a way to tell the login name of a visitor to a website?
View Replies View RelatedHow To Determine If Classes Use Comparable And Comparator
Apr 13, 2015Which of the following classes uses Comparable and Comparator?
QueueTreeSetStackPriorityQueue
In the above question, what does 'uses' mean? Does it mean do above classes implement Comparable and Comparator?
I know that in order to compare any two elements stored in one of the above classes, we need to make the elements' class to implement one of these - either Comparable or Comparator.
Nested If / Else - Cannot Determine Logical Mistake
Jan 5, 2015The title says already where my difficulties are. I forgot to say, the "S" printing part works, but why the others doesn't. To make it more clear:
java Monoton 1 3 3 4 & java Monoton 1 3 4 1
=> nothing (my output)
I forgot to notice, with 1 3 3 4 as parameters it jumps out at if (b < c), which is expected. but it jumps out of the whole if instead just run the else part. that's the essence of my problem.
The Exercise:
=> The program should print the following letters;
S, if every number is true bigger than the before,
M, if every number is bigger or equal than the before,
N in the other cases
Examples (from the exercise)
=> java Monoton 0 1 2 4
S
=> java Monoton 1 3 3 4
M
=> java Monoton 1 3 4 1
N
The Exercise should done without the use of logical operators or other combined requirements.
Java Code:
public class Main {
public static void main(String[] args) {
int a = Integer.parseInt(args[0]);
int b = Integer.parseInt(args[1]);
int c = Integer.parseInt(args[2]);
int d = Integer.parseInt(args[3]);
[Code] .....
Algorithm That Determine Ancestors And Descendants
Dec 16, 2014I have a problem with this example. I don't understand what should I do. Data on family relationships are contained in two tables.
Table 1 has a column Child and Mother,
Table 2 - Child and Father.
Formulate algorithm that determines: all the descendants of a person X, all the ancestors of a person X. Write a program implementing the algorithm.
Determine All Of Perfect Squares Between 1 And 100 - Precision Error?
Mar 26, 2015I am teaching myself Java and am trying to write a function that will determine all of the perfect squares between 1 and 100 but am running into a problem...
Here's my code:
package sqrroot;
public class SqrRoot {
/**
* @param args the command line arguments
*/
public static void main(String[] args) {
double sroot, rerr;
int count = 0;
for(double num = 1.0; num <= 100.0; num++){
[Code] ....
and here is the output:
run:
0.0
1.0 is a perfect square.
0.0
4.0 is a perfect square.
[Code] ....
There are 49 perfect squares between 1 and 100.
BUILD SUCCESSFUL (total time: 6 seconds)
Which is clearly wrong. Is there something wrong with my code or is this due to inherent imprecision in the double type or the Math.sqrt function?
Servlets :: Determine Which HttpSession Attribute Value Changed?
Feb 15, 2015I'm looking to figure out if it's possible to do the following:
HttpSession session = request.getSession();
session.setAttribute('name', 'Jane_Doe');
// more code here
session.setAttribute('name', 'John_Doe');
Obviously, you can use the HttpSessionAttributeListener to determine which attribute has changed. However, it doesn't return the new value but rather the old one.
You can use the HttpSessionEvent listener to determine when a session object has been changed.
Is there a way you can determine when a session object changes (and it does NOT occur when the setAttribute method is called...) and determine the updated key:value pair?
Allowing User To Determine When A Program Is Stopped?
Nov 8, 2014I was tasked with building a program that counts vowels in a phrase or word. I have this working properly, but the problem arises in the next situation. Here is my code:
Scanner userInput = new Scanner(System.in);
int userDecision;
String Choice;
String Phrase;
int vowelCount = 0;
System.out.println(" This program will count the number of vowels in it.
[Code] ....
As you can see, I used a 'for' statement to declare how long the program should run. However, I need the user to be able to say when it ends. For example, at the end of the program it must say "There are ______ number of vowels in your word. Please press '1' to run the program again, or any other number to exit."
I understand a do-while loop is needed here, but every time I try and create an adequate loop with no logic errors, I either break my existing code, or the program does not work correctly.
Basically, my question is, what is the best way to perform this task? Is a do-while loop necessary, or is there a better way?
Way To Determine Class Of A Random Anonymous Object?
Jun 20, 2014Wanted to know Is there any way to determine the class of a random anonymous object?
View Replies View RelatedDetermine Positive And Negative Values Have Been Read
Feb 4, 2015The program work somehow, but it can't count the first input when user key in.
import java.util.Scanner;
public class DetermineValues {
public static void main( String[] args ) {
int sum;
int minus;
int data;
[code]....
Determine If There Is Path From One Vertex To Another - Why Is This Returning False
Dec 7, 2014This method pretty much determines if there is a path from one vertex to another. When I check to see if there is a path from 5 to 2 (which there is) it return false. However, when I create a driver method, it return true (which it should). Why? It should never reach outside of the else because the condition is met, right???
Here is the graph:
0 1 2 3 4 5
------------
0| 0 1 1 0 0 0
1| 0 0 0 0 0 0
2| 0 0 0 1 0 0
3| 1 0 0 0 0 0
4| 0 0 1 0 0 1
5| 0 1 0 1 0 0
Path: 5 points to 1 and 3 (1 does not have a path to anything). 3 points to only 0. 0 points to 1 and 2. Thus there is a path from 5 to 2.
Here is the code without the driver (the one that is returning false, even tho it should be true)
public boolean existsPath(int x, int y){//x = 5, y = 2
stack.push(x);//mark x as visited
if(x == y){//path found
stack.removeAllElements();
return true;
[Code] ....
Control Rectangle And Determine Where It Moves - Key Presses
Mar 11, 2014I am writing a program where i am trying to control a rectangle and determine where it moves, everything is working fine it is moving but i am trying to figure out how to change direction using the "WASD" keys. This is what I have and I am not sure why its not working.
Java Code:
addKeyListener( new KeyAdapter() {
public void keyReleased(KeyEvent event) {
for (MoveableShape creature : creatures) {
if (((Creature)creature).isPlayer()) {
if (event.getKeyCode() == KeyEvent.VK_W) //up
[Code] ....
Determine If User Input Is Fibonacci Number Or Not
Oct 20, 2014Part A: While Loop Program
Write a program that detects Fibonacci numbers. Prompt the user to input a positive integer. Upon input, the program will determine if the number is either a Fibonacci number or not. If a Fibonacci number, then the order of the number in the sequence must be output. If not a Fibonacci number, then the Fibonacci numbers above and below it (including their order in the sequence) must be output. Once it finishes, the program will prompt the user for a new number. The program will exit if the user enters a string (such as “quit”) instead of an integer. Use the sample output file, fib-seq-det.txt, to view a sample session
This is my project, I wrote a programs that tells you if the input number is a fibonacci number or not. For some reason it only works for some Fibonacci numbers but not all of them.
import java.util.Scanner;
public class While
{
public static void main(String[] args) {
System.out.println("Welcome to the Fibonacci Sequence Detector
");
Scanner in = new Scanner(System.in);
System.out.print("Please input a number for analysis: ");
int input = in.nextInt();
[Code] ....
Nested For Loops - Determine If Inputted Integer Is Even Or Odd
Sep 29, 2014So I cant figure out why my output for my for loop isn't working properly. So the output for the square comes out right but the for loop isn't working properly for the H. I have tried to figure it out and it should go to the next line but its not.
import java.util.Scanner;
public class Random
{
public static void main(String [ ] args)
{
[Code] ....
Output
Enter a positive odd integer: 5
Square:
*****
* *
* *
* *
*****
H:
* *
Write A Program To Determine Sum Of Following Harmonic Series For A Given Value Of N
May 9, 2014write a program to determine the sum of the following harmonic series for a given value of n:1+1/2+1/3+.............................+1/n the value of n should be given interactively through the keyboard.
View Replies View RelatedJavaFX 2.0 :: Determine Which CombBox In A Pane Has Been Clicked?
May 14, 2015I have a pane with numerous comboboxes. Each ComboBox must perform an action when the mouse button is clicked on the ComboBox (OnMouseClicked). I have written a function that operates on a particular ComboBox, but I want to generalize it to operate on any of the CombBox objects clicked. I think the function should resolve the CombBox object within the function itself, and perform the operations on that ComboBox. But, I don't know how to get the ComboBox from within the function itself.
I have tried viewing the ComboBox documentation, but there doesn't seem to be a method that lets a clicked ComboBox notify the OnMouseClicked action which ComboBox has been clicked. How I go about identifying the clicked ComboBox within the OnMouseClicked function?
Equivalent Arrays - Comparing 2 User Inputs To Determine If Same
Mar 4, 2015I have been stuck on this for the past 2 hours, basically we have to compare user input, put user input into an array and compare for equivalency. An example of the program:
Array 1: 1 2 3 4 5 6 7 8
Array 2: 1 2 3 4 5 6 7 8
Array 3: 1 2 3 4 5 6 7 8 9
Array 4: 1 2 3 4 5 6 7 8
Array 1 & 2 are equal
Array 1 & 3 are not equal
Array 1 & 4 are not equal.
This cannot be done by importing Java.util.Array at all!! (my research only find this to compare arrays ) which is why I am having trouble starting off. My code thus far:
import java.util.Scanner;
public class Lab07b {
public static void main(String[] args) {
Scanner input = new Scanner(System.in);
System.out.println("Enter Integer 1:");
int a = input.nextInt();
[Code] .....
Process Data And Determine Winners - Two Dimensional Arrays
Feb 4, 2015The international Olympics Committee has asked you to write a program to process the data and determine the medal winners for the pairs figure skating. You will be given the following file: Pairs.txt
Which contains the data for each pair of skaters. The data consists of each skater's name, their country and the score from each of eight judges on the technical aspects and on the performance aspects. A typical record would be as follows:
Smith
Jones
Australia
5.0 4.9 5.1 5.2 5.0 5.1 5.2 4.8
4.3 4.7 4.8 4.9 4.6 4.8 4.9 4.5
The final score for each skater is the sum of the average of the two categories of score. Design a class to hold the above data and the final score. Read the data in from the file and calculate the final score for each pair. Sort the array of objects , and display the results on the screen in order, giving special prominence to the medal winners.
Here is my CLass:
public class Skaters {
private String name1;
private String name2;
private String country;
private double [] arrTech = new double [8];
private double [] arrArt = new double [8];
private double score;
[code]...
how do i print my 2 arrays using the file? i got the name1, name2 and counntry to print but im stuck on printing the scores that are stored in the arrays. Also, i have to print the average for each array. one is for techniques and the other one is artistic. as you can see i already wrote the code for it but im stuck in printing it.
Servlets :: Feature Detection - Determine Browser Type
Apr 22, 2014I need to be able to detect IE 9, IE 10, IE 11 and the latest from Firefox and Chrome. The old method using the user-agent string is unreliable and not recommended. There is a different approach called, "Feature Detection". But I need to know what features to test to determine the browser. I can write it myself, or if there is a handy dandy API using feature detection already written that would be OK too.
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