Running Programs Through Java
Mar 30, 2014
I've been playing around with this for about an hour.
Java Code:
Runtime runTime = Runtime.getRuntime();
try {
Process process = runTime.exec("notepad");
} catch (IOException e) {
e.printStackTrace();
} mh_sh_highlight_all('java');
So that works. Notepad will open.
However, I'm trying to get other programs to open. Specifically, this program: C:Octave3.2.4_gcc-4.4.0inoctave-3.2.4.exe...However, using that in place of notepad doesn't work. I'm assuming that there is some sort of system variable that explains why simply typing "notepad" works? As if you type notepad into the run box, notepad will open. Soo does that snippet work by going through some sort of system variables?How would I go about opening other programs, such as the one I referenced above.
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Dec 17, 2011
My PC runs on Windows XP. When I try to run a java program (written using NetBeans) from the command prompt, the program opens in NotePad but does not run.This is what I have been typing at the command prompt:
C:javahellosrchelloHello.java
The above is the correct path to the Java file on my PC.how to run the program from the command prompt or perhaps link me to a tutorial that explains it?
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May 8, 2015
how to structure simple programs (i.e. one-method algorithms for a simple purpose). There are a few different ways that I have been doing it, but I want to be consistent. Should I put both the one-method algorithm (e.g. a factorial function) and the main method that executes the algorithm into the same class and then export it to an executable .jar file for use? Or should I create one class for the algorithm and another for the main method that executes the algorithm? In addition, is there any reason that I should out these classes in a package before I export it?
As another similar question, if I have constructed two distinct classes with two separate purposes, and they are both used in the construction of a single program, then would it be best to just put the main method in a third, separate class or should I put it in one of the two classes?
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Jan 26, 2014
How do I set the class path, the path, compile and run java programs using jdk and jcreator?
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May 19, 2014
This is my program: RemoteXMLRead.java
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.DocumentBuilder;
import org.apache.commons.io.filefilter.WildcardFileFilte r;
import org.w3c.dom.Document;
import org.w3c.dom.NodeList;
import org.w3c.dom.Node;
import org.w3c.dom.Element;
import java.io.File;
[code]....
It is working fine when i run in Eclipse, but is giving error when i run in cmd.. What i need to do to over come this..
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Mar 27, 2014
I was wondering if you use an IDE when writing programs?Can you use J frame when using command line or is it just used with an IDE and do you go into framing in the book?I have taken programming classes and I am still stuck.
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Sep 15, 2014
What programs use abstract classes?
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May 20, 2014
I'd like to make a simple cheat for an old game that's offline... It has no type of anti-cheat and I'd like to make a program that changes how much money you have... I think the first thing I have to do is get the data address or something like that by using cheat engine... How do I do that? After that how do I start using that info in my program and then send back a new value? Are there any classes that I should be importing and what methods do I use to do this?
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Nov 16, 2014
I have a programs to write which is to display only the odd numbers between 1 and 15 and the code i use it is not display what i was expecting it to but instead it looping 15 times and at the end it says that the odd number is 15 or 1. where or what have i entered wrong. it supposed to display only the odd numbers between 1 and 15here is the code that I write.
Scanner input = new Scanner (System.in);
int i, num=0, count = 0, count_odd = 0, oddnum = 0;
for(i=1; i<=15; i++) {
System.out.println("Please enter number");
num = input.nextInt();
}
[Code]....
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Jan 21, 2014
Whenever I make something in Swing, I always need to resize the window for me to see the graphics on the window. I have been told to use the pack() method on it, which I have, but the problem with it is that it just sets the window to a minimal size, only displaying the x + and -.For one of the "games" I made, it at first didn't work until resize, then I added a repaint() after the constructor and it worked for me, but when my friends download it they cannot see it.
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Sep 25, 2014
So I am making a program that will allow programs only at a certain time and i'm not sure how I would set the time for the program.
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Apr 24, 2014
import acm.util.* ;
import acm.program.*;
import java.awt.* ;
class Chap6_ex1 extends ConsoleProgram {
public void run() {
println("This program displays a randomly schosen card.");
int number = rgen.nextInt(1 ,13);
int suit = rgen.nextInt(1 ,4);
[Code] ....
I am running the this from a Linux command line , in the cmd first i use :
javac -classpath acm.jar Chap6_ex1.java
end then :
java -cp .:acm.jar Chap6_ex1
The output i m getting after second command is :
Exception in thread "main" acm.util.ErrorException: Cannot determine the main class.
at acm.program.Program.main(Program.java:1358)
I know the problem is from the RandomGenerator class in packet acm.util.* but i dont know how to fix the problem . Every other program has worked . What I am missing or how this whole issue of packet importing works when running a java file from cmd ?
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Nov 12, 2014
I have built a Java app that uses SQLite (sqlite-jdbc-3.8.7.jar). Running the jar file on windows works as expected however, trying to run it on Ubuntu Server 14.04 has turned into quite a task!
I put together a brand new machine in VirtualBox for testing. I installed Java (sudo apt-get install default-jre) and have installed SQLite (sudo apt-get install cl-sql-sqlite3 sqlitebrowser). I created a new sub-directory within my home directory and copied over the jar file. From terminal, I then run the command: sudo java -jar ProductionView.jar and I receive a java.lang.unsatisfiedlinkerror. For troubleshooting, within the app, before making a connection to the db, I have printed out the location of where the db is to be created and it is correct (see attached pic). Is there more that needs to be configured before I can run this app on Ubuntu? I have posted the relevant code below :
(AppDatabasePath() is what is printed in the image...).
public static String AppDatabasePath() {
return AppPath() + APP_NAME + ".db";
}
public static String AppDatabase() {
return "jdbc:sqlite:" + AppDatabasePath();
[Code] .....
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Apr 16, 2015
I have tried to get my dinky little program I wrote to be stored as an executable through Eclipse to no avail. It seems I have tried everything else as well, to no avail. I do not want it to go through command prompt, but rather have it be its own entity. As you can probably tell my knowledge of Java and coding is limited, but always willing to expand.
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Mar 27, 2014
I am just learning Java and I am have a problem running programs at the command line. I have the following code:
package java_help;
import java.io.IOException;
class help {
[Code].....
I can run this program in net beans were I originally wrote the program and it runs fine there. I also compile the program at the command line using javac but when I go to run this program I get a error message that it cant find main.
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Mar 10, 2014
i have windows 7. cmd.exe told me it couldn't recognize javac.i have a JDK installed though...
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Jan 25, 2014
I want to know is there any way to run java program without installing jdk.
I want to run my code on system which dnt have jdk installed on it. is it possible??
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Feb 18, 2014
I want to develop a Java EE application for the following scenario.
Webapp takes a file from a user and analyze the file. This analysis could take hours. User should be able to check if the analysis is finished via AJAX. When the analysis is finished user should be able to view the analysis report that has been generated by the analyzer.
I checked what are the possibles ways I could achieve this but couldn't get a clear idea. I heard about JMS, Work Manager API and servlet asynchronous processing. But still not sure what to use and how to use.I'm not very much familiar with EJB.
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Jul 10, 2014
I'm trying to run a command line executable file using java but there is no output. On the task manager a conhost process opens when the application is run. I've tried
1)try {
Runtime.getRuntime().exec("D: est.exe");
} catch (Exception e) {
e.printStackTrace();
}
2)String[] cmd = { "D: est.exe"};
Process p = Runtime.getRuntime().exec(cmd);
p.waitFor();
and
3)//Runtime.getRuntime().exec("D: est.exe", null, new File("D:"));
same thing happens i.e. nothing happens.
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Jul 1, 2014
I have to store data I've pulled from the web i wanted to do this by storing it in a database but after looking at some tutorials i'm not sure if its possible as the databases don't seem to run with the application but instead run as an independent entity.if its possible to have a database in the java application so it runs when the application runs.
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Dec 9, 2014
I need to parallelize my java application in order to run it in a cluster with many nodes where is OpenMPI.
My code works like this:
In the First.jar (the code below) runs a for loop many times which executes another jar file (Second.jar) with different argument in every loop.
Java Code:
for (int i = 0; i < gameEnd; i++) {
Runtime.getRuntime().exec("java -jar Second.jar "+plrA+" "+plrB+" "+path+");
} mh_sh_highlight_all('java');
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Dec 1, 2014
I've Installed oracle JDK version 1.8 on a debian machine that already has openjdk 1.6.i've set the path variable in etc/login.defs and java_home variable In etc/environment. When I echo $JAVA_HOME it points to the oracle version correctly and when I run javac It uses the oracle 1.8 version. The problem is when I run the java command , It runs the openjdk 1.6 version and I'm not sure why.If I type java -version It shows the openjdk version.
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Sep 14, 2014
I am trying to create a program that allows me to enter 5 students numeric grade (0-100) to a letter grade (A, B, C, D, F) and I CANNOT use an array. When I try to run my program it says main class not found, and when I change the it from a string to a void in the main method it does not work.
Java Code:
import java.util.Scanner;
public class Week3ControlStatements2
{
public static String main(String[] args){
int numberGrade = 0;
int quotient = numberGrade / 10;
int remainder = numberGrade % 10;
[Code] ....
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Jun 18, 2014
I have a java application which uses Google Maps to analyze the traffic condition. But sometimes it can be run and work properly, sometimes not. On some computers on which there is installed java, the program can be run, and on some, again with installed java (jre), exactly the same version, the program can not be run. For example the application first run well on my desktop computer, connected in a LAN, and then stopped working well when run. But when I use laptop which uses the WiFi and run the same computer using VMWare, if I connect to the desktop on which the program can not be run, on the laptop the same program can be run well, in the same room, but using the Wifi.
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Jan 2, 2015
I downloaded this code from Head First Java. But when I tried running it on Eclipse, it gives this error message.
import javax.sound.midi.*;
public class MiniMiniMusicApp { // this is the first one
public static void main(String[] args) {
MiniMiniMusicApp mini = new MiniMiniMusicApp();
mini.play();
[code]....
and this was the error message: Jan 02, 2015 8:10:36 PM java.util.prefs.WindowsPreferences <init>Could not open/create prefs root node Software Java SoftPrefs at root 0x80000002. Windows RegCreateKeyEx(...) returned error code 5.
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Apr 15, 2011
At our company we run a third-party Java-based GUI application on one of our Linux server machine, displaying the application to our local Windows work stations using the Cygwin X Server.We noticed a few problems with a new version of this application and was able to narrow it down to the following conditions:
1. Java Swing application running on a UNIX host;
2. Java used is 1.6 (problem not noticed when using Java 1.5)
3. Displaying to Cygwin X server (I've heard other windows-based X servers have the same issue, but I don't have access to any others at this time).
If we run the application natively on Windows, I'm told if the application runs on the Linux host and displays natively to that machine's display there are no problems (although I'm not able to verify this myself).The problems are:
1. Any new frame/dialog is opened in the geographic center of the dual displays, rather than in the middle of one or the other;
2. Any attempt to drag the window to a different location on the display seems to work, but as soon as you let go of the drag, the window snaps back to the original location. This only happens the first time you try to move each window.
3. Drop-down controls (JComboBox, for example) just close back up as soon as you click on them. If you click and drag the mouse to attempt to make a selection, no selection can be made.
Are these known problems using 1.6 on UNIX displaying to Windows-based X Servers?
The only real problem is number 3. I expect that if I put more work into the window placement, I should be able to get past number 1. Number 2 is just a minor annoyance.The following is a simple Java Swing application which when run in the correct environment will exhibit the problems.
import java.awt.EventQueue;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.Insets;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
[code]....
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