How to import data from a file using Object Oriented Programing? I know how to write OOP Java and I know how to read data from a file in Procedural Java but would like to know more about how to do it OOP. Is it the same as reading data process as in Procedural programming?
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*initiating theGrid[][]*
public Zhang()
{
con.setLayout(new FlowLayout());
for (int xDimension = 0; xDimension<theGrid.length; xDimension++)
[Code] ....
All I'm getting as a blank screen and I've searched for what to put into object oriented code to make the image show up how to program using 2d arrays. I don't get any error messages (which is good I suppose) but how to make the image show up because I have stuff under the graphics and draw methods, did I do something wrong where initializing the array?
I'm really new to object oriented coding. A good way to create a Text Based Game that used objects as rooms, and items. However, I can't figure out what the best way to define and use rooms and items would be. I've been at it for the past few days, and just can't think of something that works well and is easy to use.
I want to have each room have it's own "inventory" of items that the player can pickup, as well as drop items into. I want items that are dropped to maintain their properties (durability, level, ect). I would also need several methods for things like getting an item from a room by the item's display name or id. For instance, if there is a room with a Broken Iron Sword, and a Stone Dagger, I'd need to be able to get the Broken Iron Sword object with the string "Broken Iron Sword".
I am working on this object oriented sentinel problem but when i am running it, its showing error.
import java.util.Scanner;
public class example1 {
private String gasmilage;
public example1(String milage){
milage=gasmilage;
[code]....
Usually, most of the time, I import the standard java stuff.But what happens when I find a code with a list of those com. imports:
import java.io.File;
import java.io.IOException;
import com.itseasy.rtf.RTFDocument;
import com.itseasy.rtf.text.Border;
import com.itseasy.rtf.text.Field;
Where are these imports and how do I "get" them?
I have written a java code to transfer files from one server to another using the concept of socket programming. I got the codes from another java forum that meet my requirements. The program is said to transfer large sized files (like .mkv , .mprg movies) from one machine to another and can be used to transfer files of all formats. But after running the codes I found that the program is not able to transfer large sized files such as movies and even pdf of sizes 80mb or 111mb. When i transfer small sized files, it gets transferred and the output shows that. You can run the codes and observe it. But when i try to transfer large sized files, the program goes on running for hours. The large sized files are not getting transferred. The program has used bytebuffer but still this error occurs. The codes are as follows (I got them from this site [URL] ....)
**ClientMain.java**
import java.io.IOException;
import java.net.Socket;
public class ClientMain
{
private DirectoryTxr transmitter = null;
Socket clientSocket = null;
[Code] .....
1. ClientMain.java and DirectoryTxr.java are the two classes under client application.
2. ServerMain.java and DirectoryRcr.java are the two classes under Server application.
3. run the ClientMain.java and ServerMain.java simultaneously
Also specify the source directory, destination directory and host address of the machine in which server is running in the ClientMain.java (as per your computer). Here we are not specifying source file, instead a source directory or folder is specifying. So the entire files of source directory will be transferred.
I have written a java code to transfer files from one server to another using the concept of socket programming. I got the codes from another java forum that meet my requirements. The program is said to transfer large sized files (like .mkv , .mprg movies) from one machine to another and can be used to transfer files of all formats. But after running the codes I found that the program is not able to transfer large sized files such as movies and even pdf of sizes 80mb or 111mb. When i transfer small sized files, it gets transferred and the output shows that. You can run the codes and observe it. But when i try to transfer large sized files, the program goes on running for hours. The large sized files are not getting transferred. The program has used bytebuffer but still this error occurs. The codes are as follows (I got them from this site [URL] ....)
**ClientMain.java**
import java.io.IOException;
import java.net.Socket;
public class ClientMain
{
private DirectoryTxr transmitter = null;
Socket clientSocket = null;
[Code] ....
Note that:-
1. ClientMain.java and DirectoryTxr.java are the two classes under client application.
2. ServerMain.java and DirectoryRcr.java are the two classes under Server application.
3. run the ClientMain.java and ServerMain.java simultaneously
Also specify the source directory, destination directory and host address of the machine in which server is running in the ClientMain.java(as per your computer). Here we are not specifying source file ,instead a source directory or folder is specifying.So the entire files of source directory will be transferred.
How to use a .class file I unpacked from a .jar file I downloaded from the Internet.
I downloaded the commons-io-2.4.jar file from commons . apache . org /proper/commons-io/
In it you can see that there is a class called FileUtil.class:
jar tf commons-io-2.4.jar | grep FileUtil
org/apache/commons/io/FileUtils.class
I extracted this with the following command:
jar xf commons-io-2.4.jar FileUtils.class
It is now in ..uk/ac/ebi/bioinvindex/services/datasearch/commons/FileUtils.class
Now, I have a java file where I would like to use FileUtils.
How do I do that? How do I import it?
I am trying to write a program, which includes an import data option. This option is used to import information from a text file.
The data is read from the file and objects are created and added to the student's record (The text file contains some information of the courses that the student is taking).
So my question is, how do i import information from a text file ?
and after they are imported, how do i create the objects in order to add them to the student's record ?
I would like to build a GUI where by I can import a text file and interrogate certain values and then display them in a window. Thing is I would like to know what window type that will support this. i.e Panel,internal frame,dialog box.. etc etc... I am using Netbeans.
View Replies View RelatedI am trying to figure out how to import a txt file that has a color and a four digit number. Everything that I have tried comes up with some kind of error.
import java.util.ArrayList;
import java.io.BufferedReader;
import java.io.File;
import java.io.FileReader;
import java.io.IOException;
import java.util.Scanner;
import java.util.InputMismatchException;
[Code] ....
I couldn't find an edit button. I need to store the String and int from the txt file into an array. The problem that I keep having is that the compiler seems to want it as either two ints or two Strings.
I have a AbstractTable and would like to import a txt file into it. I know how to do it for a Default Table but I am not allowed to use it.
// Import Filechooser
public static ActionListener importChooseFileButtonListener = new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
JFileChooser jfc = new JFileChooser();
int returnVal = jfc.showOpenDialog(jfc);
ImportPopup imp = new ImportPopup();
[Code] ....
What do I have to do to import the file into the table?
Whenever I use a control inside an .fxml file like:
<Label></Label>, <TableView></TableView>, etcera ...
I get an exception for example:
Label is not a valid type., TableView is not a valid Type., etcera
This exception I then solve with placing an import tag inside the .fxml file.
However as I do not know each import name, I have to look this up like writing down:
Label label = new Label();
inside a class and then place my cursor on it to see which import name Eclipse generates.
This import name i then put inside the .fxml file with <? import ?> beginning and end tags with question marks around it.
Is there anyways to automatically generate these import tags inside an .fxml file even if you don't know the import name for the control you want to use?
If you store a Timestamp in a database (in my case, I'm looking at DB2), doesn't something on the back end convert it to UTC? And then when you read it back out, it gets converted to the local time zone? How does this happen?
Lets say you are using a computer in one time zone, but the database is running on a server in another time zone. What conversions take place upon storage and then retrieval?
And here is where it gets a little more Java specific. Using a PreparedStatement or a ResultSet, you can change the time zone when setting and retrieving a Timestamp.
Example:
Calendar calendar = Calendar.getInstance(TimeZone.getTimeZone("GMT"));
ps.setTimestamp(2, timestamp, calendar);
And you can read it out from a ResultSet in a similar fashion.
However, isn't using such methods technically wrong? If the database is trying to store your instant in time accurately, doesn't specifying a Calendar other than the one in your local time zone cause the database to actually store an incorrect instant in time?
So I need to read Timestamps from a database, and I've been told they are stored as GMT. This has caused me great confusion. I think what I need to do is just read it out from the result set using a Calendar set for GMT timezone.
I decided to write a small Java program to experiment around with BorderLayout, because I'm developing a Java game and I need to have 2 objects placed in a single JFrame at the same time, and everyone I asked said I need BorderLayout to do that.Before you answer: Also, is using BorderLayout the best option for adding multiple video game oriented objects such a sprites to a JFrame?
So the Java program I wrote is supposed to place a JButton on the JFrame and ALSO place a graphic component (a rectangle in this case). The problem is, only the button shows up, as can be seen in the image link below: URL....
Here is the code:
**main.java** --> The main method class + JFrame/JPanel/JButton constructor
import java.awt.BorderLayout;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
public class main {
[code]....
I am working on a project that requires me to build a database with random access file, representing products, the base product contains a name (about 30 characters), a price (double), and a quantity (integer). I have worked on this project for probably 15+ hours and have tried so many things and feel like I've barley made any progress...
The part i am really struggling with is taking the data from the text file and creating an object array with it using the product class. Once ive accomplished that, i have to use that data to create a random access file with the data.
Here is the base Product class that must be used to create the objects for the array.
public class Product
{
public String pName;
public String stringName;
public double price;
public int quanity;
[Code] .....
And then here is the data from the text file that i must extract to use to create product objects.
Dill Seed,938,34
Mustard Seed,100,64
Coriander Powder,924,18
Turmeric,836,80
Cinnamon (Ground Korintje),951,10
Cinnamon (Ground) Xtra Hi Oil (2x),614,31
Cinnamon (Ground) High Oil (1X),682,19
These continue for about 40-50 entries, they are not separated by a blank line though i had to add those so it would display correctly, each entry is on its own line with name separated with spaces, then price after a comma, then quantity after the second comma.....
I am working on a project that requires me to build a database with random access file, representing products, the base product contains a name (about 30 characters), a price (double), and a quantity (integer). I have worked on this project for probably 15+ hours and have tried so many things and feel like I've barley made any progress...
The part i am really struggling with is taking the data from the text file and creating an object array with it using the product class. Once ive accomplished that, i have to use that data to create a random access file with the data. Here is the base Product class that must be used to create the objects for the array.
public class Product
{
public String pName;
public String stringName;
public double price;
public int quanity;
[Code]...
these continue for about 40-50 entries, they are not seperated by a blank line though i had to add those so it would display correctly, each entry is on its own line with name seperated with spaces, then price after a comma, then quanity after the second comma.....
I am working on a project that requires me to build a database with random access file, representing products, the base product contains a name (about 30 characters), a price (double), and a quantity (integer). I have worked on this project for probably 15+ hours and have tried so many things and feel like I've barley made any progress...
The part i am really struggling with is taking the data from the text file and creating an object array with it using the product class. Once ive accomplished that, i have to use that data to create a random access file with the data.
Here is the base Product class that must be used to create the objects for the array.
public class Product
{
public String pName;
public String stringName;
public double price;
public int quanity;
//Constructor
public Product( String pName, double price, int quanity )
[code]....
and then here is the data from the text file that i must extract to use to create product objects.
Dill Seed,938,34
Mustard Seed,100,64
Coriander Powder,924,18
Turmeric,836,80
Cinnamon (Ground Korintje),951,10
Cinnamon (Ground) Xtra Hi Oil (2x),614,31
Cinnamon (Ground) High Oil (1X),682,19
these continue for about 40-50 entries, they are not separated by a blank line though i had to add those so it would display correctly, each entry is on its own line with name separated with spaces, then price after a comma, then quanity after the second comma.....
I'm just trying to learn how to cut the IDE out of my programming.I've added C:Program FilesJavajdk1.7.0_55in to the environment variables (path), am navigating to the src folder where my java class exists in cmd prompt, and then typing "javac CaesarCipher.java", but its complaining that it can't find the file.
Is the problem something to do with the relative address of the compiler to the file it needs to run? Just a stab in the dark on my part. Or do I have to add the JRE path as well as the compiler?
what exactly is a file object? I'm analyzing some code and have trouble grasping what a file object is. I know I'm creating a new file object but I realize it does not actually create the file on my computer. For instance, for "please enter the file name which contains the key" a new file object is created. However, it will not be found and the exception catches the error. Does the file object act as an address or location?
package cryptography;
import java.util.*;
import java.io.*;
import java.util.regex.*;
public class Main {
[code]....
I find myself asking these two questions because I see them as relating. First question is; I always write
Java Code: f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); mh_sh_highlight_all('java');
(where f is a JFrame object)
to set the close for the JFrame. What I don't get about this is what is going on in the parenthesis. I looked in the Java Documentation, and it says an int goes inside. In that case, I don't really get what the word JFrame is doing there. Overall, please explain what is inside the parenthesis of that line and why it has to be there.The second question is a generic question. I notice a lot of times an object will be created, and as its parameter, you will have to instantiate an object. an example would be
Java Code: Class f = new Class(new Object) mh_sh_highlight_all('java');
What does it mean when an object gets created inside of a new object? Why is putting Java Code: new Object mh_sh_highlight_all('java');
ever necessary when concerning the two parenthesis?
The goal is as follows: Write a UDP 'CompressionServer' that will take input from the user until it sees a "magic string" at which time it will create a compressed and uncompressed version of the file in the file system.
So, I need to integrate the following "Zip" code in to my UDP server code (which already creates the uncompressed file)... That is where I am stuck at now. My first few attempts had the Zip code after I write to "fout" but that failed to create a ZIP file.
I guess the main point here is what are the key pieces of the ZIP code that I should include and what would be the best spot to place them in my server code...
Zip Code:
import java.io.*;
import java.util.zip.*;
public class Zip {
static final int BUFFER = 2048;
public static void main (String argv[]) {
try {
String fileInput = argv[0];
String fileOutput = argv[1];
[Code] ....
class triangle
{
public static void main (String[] args)
{
System.out.println("Provide three side lengths - 000 to terminate.");
int a = In.getInt();
int b = In.getInt();
int c = In.getInt();
[code]....
My problem is that when I enter 5,2,5 it should be isosceles and acute but it comes out as isosceles and obtuse, and when I type 5,5,5 it comes out equilateral and right. The only one that works is if I enter 3,5,4 it will come out as scalene and right. I been at this for a while and my math looks correct.
I'm having problems programming the LightsOut game. I made a 5*5 matrix and filled it in with 1's and 0's, where 1 means on and 0 is off, they should be placed randomly. The player can choose a field, for example "A2", and the matrix should change according to the input. My problems are how can I choose a field ? How can I display the new matrix after playing the first step and so on?
PS: I'm using the console because I'm still not good with JOptionPane commands.This is my code for the Game:
public class TestLightsOut {
public static void main(String[] args) {
// TODO Auto-generated method stub
int[][] blocks = new int[5][5];
String[] letters = { "A", "B", "C", "D", "E" };
String[] numbers = { " ", " ", " ", " ", "1 ", "2 ", "3 ", "4 ", "5 " };
String[] line = { " ", " ", "_", "_", "_", "_", "_", "_", "_",
"_", "_", "_", "_" };
[code]...
What is difference between algorithm and programming?How to develope algorithm knowledge?
View Replies View RelatedI'm learning Java and came across saving user preferences. As I was learning I also learned about object serialization and File input/output. I've heard that the windows registry can be a problem because it can quickly become a dumping ground for uninstalled programs. So my question is why should I use the Preferences API? and is it really good practice to program to the registry for saving information? I'd also like to be in good standing towards the programs I write so if it is common practice to write to the Registry how exactly would I manage the information that I dump into the Registry?
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