Input/Output Arrays
Hello,
I am new to Java, and have just recently started learning it. I am student working with a math prof, and I need help with a program that would help our research.
First of all, is it possilbe to input numbers from a textfile which just contains numbers like so:
1
2
3
4
5
6
Into an 2x3 array, like [1 2 3]
[4 5 6]
Could someone help me with the code? Once I have these saved into an array then I am able (with my limited Java knowledge) to do what I need to do with the arrays, it is just a question of transfering the numbers in the first place.
Thanks to anyone who could help, as you'd save me a great deal of time.
Mike Lukas
Mike this is not a problem that is specific to Java, nor any other language really, but rather is a type of problem that would be assigned in an introductory programming class.
In my time at college I took my options in Math, and I assure you that there are many Math students that know how to solve this problem and then implement it in Java.
Take a look at basic loops and how they work and indexing methods. That is about all the help I will render for you, until you get your own code and post it.
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Need help with connecting file inputs to arrays
In this assignment I have a program that will do the following: display a list of names inputed by the user in reverse order, display any names that begin with M or m, and display any names with 5 or more letters. This is all done with arrays.
That was the fun part. The next part requires me to take the names from a Notepad file, them through the arrays and then output them to a second Notepad file.
Here is the original program: (view in full screen so that the code doesn't get jumbled)
import java.io.*; //Imports the Java library
class progB //Defines class
public static void main (String[] arguments) throws IOException
BufferedReader keyboard; //<-
InputStreamReader reader; // Allows the program to
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keyboard = new BufferedReader (reader); //<-
String name; //Assigns the name variable which will be parsed into...
int newnames; //...the integer variable for the amount of names.
int order = 0; //The integer variable that will be used to set the array size
String[] array; //Dynamic array (empty)
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name = keyboard.readLine ();
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String temp;
int length; //Defines the length of the array for a loop later on
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{ // Takes the inputed names and
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{ // Outputs the names in the reverse
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System.out.println (" Name " + order + " is " + array [order]); //<-
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}The notepad file contains the following names:
jim
laruie
tim
timothy
manny
joseph
matty
amanda
I have tried various methods but the one thing that really gets me is the fact that i can't find a way to connect the names to the arrays. Opening the file with FileInputStream is easy enough but using the names and then outputing them is quite hard. (unless i'm thinking too hard and there really is a simple method)By "connect", do you just mean you want to put the names into an array?
array[0] = "jim"
array[1] = "laruie"
and so on?
That shouldn't be difficult at all, provided you know how to open a file for reading, and how to read a line of text from it. You can just read the line of text, put it in the array position you want, until the file is exhausted. Then open a file for writing, loop through the array, and write a line.
What part of all that do you need help with? -
How the buffereing is done in buffered input/output streams?
From the API doc I got to know that they use internal buffer to store bytes before they can be read or written. But i found that File input/output stream also have methods like read(byte[]) or write(byte[]). So what is extra in buffered input/ouput streams? Does the phrase "buffered" suggests that bytes can be read from an array or be written to an array? Am i thinking the right way?How the buffereing is done in buffered input/output
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Input/Output And Method Not Found Problem
Ok so firstly I think I should apologise on two fronts.
Firstly, 'cause this is probably posted in the wrong board but I'm not sure this was suitable for the Swing board just 'cause I've been using Swing? And secondly 'cause the code I'm gonna post is so shoddy I would think this constitutes as flaim-bait. >_>
In my defense this is purely for a little class project to give something to write some documentation on so I'm really not too bothered about the efficiency or ace-mazingness of the end result. I just want it to work.
To the problem at hand.
I'm trying to write a program that asks the user a question and then outputs their answer to a file, from which a tally of answers can later be made for the purpose of displaying "results".
My problem is I've been having problems with the input/output of saving the answers given to the program.
I'm still learning and input/output is probably my weakest subject (other than, y'know, being good at Java). I've had a bash at it in the following code but all it does it overwrite what is in the file with a single answer so no list of results accumulate. I generally don't have an idea what to try for that one so any pointers would be appreciated.
Also, my second problem is, in trying to gather results by tallying what is contained in the file, I've run across a problem with the charAt() method not being found and I'm not sure why. Isn't that method a part of java.lang?
Here's the code thus far:
//libraries
import javax.swing.*;
import javax.swing.border.*;
import javax.swing.text.*;
import javax.swing.event.*;
import java.awt.*;
import java.awt.event.*;
import java.text.*;
import java.io.*;
class CaseStudy {
public static void main(String args[]) {
GUI maininterface = new GUI();
maininterface.setupMenu();
maininterface.display();
class GUI {
//for the actionlisteners
int whatframe = 0;
//creates mainframe and border content panel
JFrame mainframe = new JFrame("Survey Client");
JPanel borderpanel = new JPanel(), bottompanel = new JPanel();
JButton quizbutton = new JButton("Take the quiz"), tallybutton = new JButton("Show Results"), submitbutton = new JButton("Submit Results"), menubutton = new JButton("Return To Menu");
QuizQuestions toppanel = new QuizQuestions();
QuizResults toppanel2 = new QuizResults();
GUI() {
//sets border in borderpanel, this spaces the main content in from the sides of the window
borderpanel.setBorder(BorderFactory.createEmptyBorder(10,10,10,10));
//sets up the frame and panels and adds on borders
mainframe.setDefaultCloseOperation(mainframe.EXIT_ON_CLOSE); // exits java when clicking on close on main frame
mainframe.getContentPane().add(borderpanel); // adds the panel as a component to the frame, the panel can hold stuffs
borderpanel.setLayout(new BoxLayout(borderpanel, BoxLayout.PAGE_AXIS));// page_axis means it'll layout vertically
bottompanel.setLayout(new BoxLayout(bottompanel, BoxLayout.LINE_AXIS));// line_axis means it'll layout horizontally
//gives button an action
quizbutton.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e1) {
setupQuiz();
tallybutton.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e1) {
if(whatframe == 1) setupResults();
else {
int rusure = JOptionPane.showConfirmDialog(null, "Are you sure you wish to show results? Any current quiz answers won't be saved.", "Please Choose One", JOptionPane.YES_NO_OPTION);
if(rusure == JOptionPane.YES_OPTION) setupResults();
menubutton.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e1) {
setupMenu();
submitbutton.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e1) {
toppanel.doQuiz();
borderpanel.add(bottompanel);
public void setupMenu() {
if(whatframe == 3) {
bottompanel.remove(menubutton);
borderpanel.remove(toppanel2);
whatframe = 1;
//adds components and lays them out
bottompanel.add(quizbutton);
bottompanel.add(Box.createRigidArea(new Dimension(0,10)));
bottompanel.add(tallybutton);
display();
public void setupQuiz() {
bottompanel.remove(quizbutton);
bottompanel.remove(Box.createRigidArea(new Dimension(0,10)));
bottompanel.remove(tallybutton);
whatframe = 2;
bottompanel.add(submitbutton);
bottompanel.add(Box.createRigidArea(new Dimension(0,10)));
bottompanel.add(tallybutton);
borderpanel.add(toppanel);
display();
public void setupResults() {
if(whatframe == 1) {
bottompanel.remove(quizbutton);
bottompanel.remove(Box.createRigidArea(new Dimension(0,10)));
bottompanel.remove(tallybutton);
else {
bottompanel.remove(submitbutton);
bottompanel.remove(Box.createRigidArea(new Dimension(0,10)));
bottompanel.remove(tallybutton);
borderpanel.remove(toppanel);
whatframe = 3;
bottompanel.add(menubutton);
borderpanel.add(toppanel2);
display();
public void display() {
//sets the size of the frame around it's components and then shows it
mainframe.pack();
mainframe.setVisible(true);
mainframe.validate(); //makes referenced container relayout it's components
class QuizQuestions extends JPanel {
LoadingSaving loadsave = new LoadingSaving();
JPanel popm = new JPanel(), pop1 = new JPanel(), pop2 = new JPanel(), pop3 = new JPanel(), pop4 = new JPanel();
JFormattedTextField ques = new JFormattedTextField(), op1 = new JFormattedTextField(), op2 = new JFormattedTextField(), op3 = new JFormattedTextField(), op4 = new JFormattedTextField();
JButton bop1 = new JButton("1"), bop2 = new JButton("2"), bop3 = new JButton("3"), bop4 = new JButton("4");
char answer;
QuizQuestions() {
popm.setLayout(new BoxLayout(popm, BoxLayout.PAGE_AXIS));
pop1.setLayout(new BoxLayout(pop1, BoxLayout.LINE_AXIS));
pop2.setLayout(new BoxLayout(pop2, BoxLayout.LINE_AXIS));
pop3.setLayout(new BoxLayout(pop3, BoxLayout.LINE_AXIS));
pop4.setLayout(new BoxLayout(pop4, BoxLayout.LINE_AXIS));
this.add(popm);
popm.add(ques);
popm.add(pop1);
popm.add(pop2);
popm.add(pop3);
popm.add(pop4);
pop1.add(op1);
pop1.add(bop1);
pop2.add(op2);
pop2.add(bop2);
pop3.add(op3);
pop3.add(bop3);
pop4.add(op4);
pop4.add(bop4);
//sets up question text fields
ques.setEditable(false);
op1.setEditable(false);
op2.setEditable(false);
op3.setEditable(false);
op4.setEditable(false);
bop1.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e1) {
answer = 'a';
bop2.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e1) {
answer = 'b';
bop3.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e1) {
answer = 'c';
bop4.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e1) {
answer = 'd';
Question1();
public void doQuiz() {
loadsave.save(answer);
public void Question1() {
ques.setValue("Who's your favourite X-Men character?");
op1.setValue("Cyclops");
op2.setValue("Xavier");
op3.setValue("Wolverine");
op4.setValue("Rogue");
class QuizResults extends JPanel {
LoadingSaving loadsave = new LoadingSaving();
JPanel popm = new JPanel();
JFormattedTextField op1 = new JFormattedTextField(), op2 = new JFormattedTextField(), op3 = new JFormattedTextField(), op4 = new JFormattedTextField();
int[] answerarray = new int[4];
QuizResults() {
popm.setLayout(new BoxLayout(popm, BoxLayout.PAGE_AXIS));
this.add(popm);
popm.add(op1);
popm.add(op2);
popm.add(op3);
popm.add(op4);
op1.setEditable(false);
op2.setEditable(false);
op3.setEditable(false);
op4.setEditable(false);
answerarray = loadsave.load();
op1.setValue(answerarray[0]);
op2.setValue(answerarray[1]);
op3.setValue(answerarray[2]);
op4.setValue(answerarray[3]);
class LoadingSaving {
public void save(char answer) {
FileReader fr;
FileWriter fw;
BufferedReader br;
String s;
try {
//ERRORERRORERRORERRORERRORERRORERRORERRORERRORERRORERRORERRORERRORERRORERRORERROR
fr = new FileReader("casestudyoutput.txt");
fw = new FileWriter("casestudyoutput.txt");
br = new BufferedReader(fr);
if (br.readLine() == null) s = "x";
else s = br.readLine();
s = s + answer;
fw.write(s);
fr.close();
fw.close();
//ERRORERRORERRORERRORERRORERRORERRORERRORERRORERRORERRORERRORERRORERRORERRORERROR
catch(FileNotFoundException exc) {
JOptionPane.showMessageDialog(null, "File not found.");
return;
catch(IOException exc) {
JOptionPane.showMessageDialog(null, "Something bad happened.");
return;
public int[] load() {
FileReader fr;
BufferedReader br;
int[] answerarray = new int[3];
String s;
long length;
int a = 0, b = 0, c = 0, d = 0;
answerarray[0] = 0;
answerarray[1] = 0;
answerarray[2] = 0;
answerarray[3] = 0;
try {
fr = new FileReader("casestudyoutput.txt");
br = new BufferedReader(fr);
if (br.readLine() == null) return answerarray;
else s = br.readLine();
length = s.length();
for(int i = 0; i < length; i++) {
char ch = charAt(i); //ERRORERRORERRORERRORERRORERRORERRORERRORERRORERRORERRORERRORERRORERRORERRORERROR
switch(ch) {
case 'a':
a++;
break;
case 'b':
b++;
break;
case 'c':
c++;
break;
case 'd':
d++;
break;
answerarray[0] = a;
answerarray[1] = b;
answerarray[2] = c;
answerarray[3] = d;
fr.close();
catch(FileNotFoundException exc) {
JOptionPane.showMessageDialog(null, "File not found.");
return answerarray;
catch(IOException exc) {
JOptionPane.showMessageDialog(null, "Something bad happened.");
return answerarray;
return answerarray;
}Any pointers/tips/solutions/angry posts to tell me to stop trying to learn Java would be greatly appreciated.
Thanks in advance!
Oh, and in trying to work with it a bit further I realised I'm having a few problems with runtime errors due to exceptions. The first was due to the array being assigned out of bounds (fixed in the above code). But the second reads the following:
Exception in thread "main" java.lang.NullPointerException
at Loadingsaving.load(CaseStudy.java:330)
at QuizResults.(init)(CaseStudy.java.259)
at GUI.(init)(CaseStudy.java:34)
at CaseStudy.main(CaseStudy.java:15)Not quite sure what this one means or how to handle it. =\
Edited by: ThePermster on May 19, 2008 8:08 AMA NullPointerException means a method has been called on a null object, or a variable that isn't pointing to any object. Your Exception points to line 330, which is:
length = s.length();A NPE on that line means that s is null. So let's look at where s is set:
if (br.readLine() == null) return answerarray;
else s = br.readLine();s gets it's value from br.readLine(), so that method must be returning null. You have a logical error here. Look at your If-Else. It reads a line, makes sure it isn't null...then it reads another line. Well what if that line is null? You are performing 2 reads here instead of 1.
Since your If condition returns a value, there's no need for an Else. The code will continue on until it reaches another return. Try this:
s = br.readLine();
if (s == null) return answerarray; -
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Hi,
I have 2 VIs - XX and YY. The output of XX generates an array of strings.
The input of YY takes in a string. I have VIs XX followed by YY in the
sequence editor.
For each item in the output array of XX, I want to pass that item into
YY and execute YY.
How do I do this in TestStand without creating an intermediate VI.
Your help is greatly appreciated folks!
ThxHi,
What you could do is set the second step to loop.
Then use as one of the parameters to VI YY the string array using RunState.LoopIndex as the array index.
eg. Locals.MyStringArray[RunState.LoopIndex]
Hope this helps
Regards
Ray Farmer
Regards
Ray Farmer -
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Do you think that would work better than Drive Genius? I bought Drive Genius 2 and it does not even see the drives when they are plugged in unlike Disc Utility which can see the drives but cannot mount either one.
Maybe this following post I made to a different questions may help. The data on the drive is other buying another program for if it will work. I think my next step may be to go over to a friends place and try to mount the drives on his computer and transfer stuff off if they connect.
text below posted to other question relating to external hard drive problem.
I have recently had the same mounting issue with my new external hard drive. I just purchased a new 750Gb Western Digital Sata drive and got everything transfered over to it. Immediately, I got an error saying that the drive had been ejected incorrectly even though it was still plugged in. I was a little curious. I restarted the computer (hard drive still plugged in via USB 2.0) and the drive showed up just fine. I plugged another 250Gb drive into the same case (2 bays) and the 250GB drive showed up just fine.
Well, I then noticed there was an OS upgrade available when I ran Software update so i ran it and when I rebooted the drives were gone. I can see the drives in Disc Utility, but they will not mount. Drive Genius cannot see either disc. Disc Utility says I need to repair the drives, but when I do it says they are fixed but they don not mount.
The problem really seems to be related to mounting USB external drives. I got ahold of 2 seperate external firewire hard drives and one shows up just fine while the other has the same problem (both work on other systems. I would try wiping the drives and reformatting but ALL MY stuff is on them and not everything has been backed up. Yuck! I have not tried connecting my hard drive to another Mac yet.
The drives being used are #1 Maxtor Maxline Plus II 250GB SATA/150 HDD 1.5b/s 7Y250m00654ra
and #2 Western Digital WD7500AACS WD Caviar GP Green Power drive.
I have another post similar to this and I have not received any feedback, but I have been doing my own searching and have found similar posts on the net.
Anybody have any clue what might be going on here? It really seems to be related to my upgrade. -
I have downloaded the text input/output widget found here:
http://www.adobe.com/cfusion/exchange/index.cfm?event=extensionDetail&loc=en_us&extid=1253 021
I inserted the input animation on one slide and the output
animation on another.
When I preview, the input box doesn't show up. What am I
doing wrong?
Thanks in advance for help or advice!Hi there
Likely you are using Captivate 3 and you have upgraded your
Flash Player to version 10.
Click
here to read a thread where I believe one of he Adobe Captivate
team sheds a bit of light on the issue
Click here for an Article
and link for uninstalling Flash Player/Plug In:
Click here for an Article
and link for installing and older version of the Flash Player/Plug
In:
Version 9 should allow things to work okay with Captivate 3
Cheers... Rick -
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WARNING: This will completely erase the ENTIRE hard drive.
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When you use an external device for input, GB often automatically selects that same device for output. It's an ease-of-use feature for most external devices. If your device doesn't give you the option to output to speakers/headphones, you don't want GB to do that.
Within GB, go to GB>Preferences, Select the Audio/Midi tab. In the Drop-down under output, choose "Built-in Output" and connect your external speakers/headphones to the Mac's headphone port (Alternately, you could use system preferences to direct your Mac's audio-output to your speakers and select "System Setting" in GB Prefs. The Mac's own speakers aren't going to be nearly as much fun as running it to your big speakers/headphones).
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Could be so many things, Input/Output errors are generally loosing contact with a device for a variety of reasons, do you get any error # with that?
Open Console in Utilities & watch for more info whn you try to burn, or open the Disk Utility Log if there. -
"input/output error' when making disc image from DVD
I've had problems installing Logic, and a Pro Apps Genius at Applecare suggested I try making an image of the problematic DVD (Audio Content 1) and then trying an install that way.
While I can make an image of the Install disc to my desktop fine, the Audio Content 1 disc reports an "input/output error".
This means I'm unable to copy the disc and then successfully install my Logic Studio.
Any ideas?Thanks for your answer.
Yes, I thought that might be the case - but I'd taken my Mac and Logic disks to a Genius bar, and the 'Genius' had said he'd fixed the issue. I just wish he'd explained what he did and why he didn't replace the faulty disk(s)!
But is there any way around having the claim a disk, now I'm living abroad and my 'warrantee' has run out? It's going to be a pain in the fundament trying to claim a replacement set.
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