my course material is due for term 1 of my cert 4 programming course, but My lecture will not pass my java projects because there is no source files generated for them in the net beans project structure, tried building, cleaning and building, all i can think of?, tried IDE's 7.4 and 8.0 .
View RepliesI am looking for a way to compile Java Source-Files at runtime and save them all in an executable jar; almost like an IDE would do. I know that there is the javax.tools package which provides a JavaCompiler interface and you can use ToolProvider.getSystemJavaCompiler() to get an instance of a compiler. However, this method has one important problem: it only works on machines that have the JDK installed. Not when only the JRE is installed.
I guess at this point that I need some kind of third party library that offers an implementation of a JavaCompiler. Unfortunately, this is really complicated to search for on the internet since all top listings when searching "compile java at runtime jre" do not really provide a solution to the problem.
I am writing a (somewhat) complex simulation software right now which is supposed to be used by people who have absolutely no knowledge of programming. At the same time, this software should provide the user with a certain amount of flexibility and control over the flow of the simulation.
My previous take on this problem was to build a complex system to interprete user settings from a GUI. I would basically read the GUI input, output it to some kind of own scripting syntax which I just quickly made up and have that interpreted at runtime. Then I realized, that is a silly concept and I threw it out before I got far into the developement.
The much better solution I came up with is taking the input from the GUI, create java source code from it and compile it at run-time. Seems much cleaner and nicer to me; will also probably have a better performance, but thats not really an issue anyways.
In using javac, I have installed the JDK, set the PATH and JAVA_HOME. When I run this:
"C:Program FilesJavajdk1.8.0_40injavac" -cp C:Gj_javacHTMLCarbonResults.java
I get: javac: no source files
Since I placed the source file path in the command line, I don't understand why it can't find the one .java file.
The problem is what to do when the source file for a class gets too big ( a judgment call for sure). Is it possible for one class to be defined in multiple files and if so how do you do it, and is it good practice?
I do see ways to refactor into a base class or move code into a helper class but sometimes the abstraction is cleaner as a single class that does a lot of stuff. My problem is how to organize a BIG class?
I'm having another issue. I have 2 java source files(see below). They are place in the same directory. How do I compile them using classpath?
I have already tried 1st attempt :
javac -cp com.companyname.interview.DuplicateReplace.java DuplicateReplaceTest.java [did not work!]
2nd attempt: javac -cp DuplicateReplace.java DuplicateReplaceTest.java [again, did not work!]
package com.companyname.interview;
public class DuplicateReplace { /* code */}
[Code] ....
I'm currently reading Head First Java and want to use the topics shown in the book while I read it to master them. What are some good projects that can be used to practice all the skills taught in the Head First Java book while I read it?
View Replies View RelatedThe naming conventions for coding Java applications are clear to me. I'm wondering what the best practices are for naming Java projects e.g. when creating a new project in NetBeans IDE or in BitBucket?
View Replies View Related1) I have a file .java with some great functions, this functions i need use in all projects, then what is the easy by moment i start a project, and copy this file to project.. is possible have only 1 file with these utilities functions? (if yes how to declare or use in all projects?)
Note these utilities file i want use on JAVA desktop(swinf and javafx), on JSP webpages and in the futhurer on the mobile.
2) I have a JSP project in 1 .JSP file i have 8 Tabs (CSS tabs) when user click on tab1 i execute some jsp java code. and if user click on tab2 i execute a different JSP code, but my problem is, the JSP file is large large large, 1500 lines, my question is: is possible (similar in PHP) do an include?
<%
include tab1.jsp
%>
What step to know to develop software..
View Replies View RelatedI want to trace how many wifi signals are available near some source within some distance in JAVA. How do I do that?
View Replies View RelatedLately I've been working with JDBC and writing queries in some Java programs. I've noticed that I keep experimenting with where I place my blocks of querying code. I've tried creating a private method in the class where the query is used, I've created utility classes where I can call the query when needed, and sometimes I've just put it in a localized block of code where I need to. Also, most often these queries are one-shot queries where I need to pull the data to populate a JTable.
In short, this has made me realize that I don't have a solid practice for organizing my queries in Java. So my question is "Is there a practice for organizing query code?".
I'm finishing my data structures class and looking for internships and trying to prepare myself for real world application of things I've learned. I'm trying to figure out what sort of project I can start or start over winter break that would use the new data structures I've learned (BSTs, Heaps, Hash Tables, etc). We have been implementing these from scratch but would I be using a library for these on the job? If so, should I implement them that way instead? I have a registrar project from my first data structures class where I used a linked list and then an array list to take care of the different students, classes, and instructors. Maybe I should clean that up and just use that?
how these data structures can be used in non-trivial situations and why I should use one over another. I just don't know a good place to start.
how java imports libraries from a jar file inside a source. Let's say I have the following code on Something.java file,
import com.mycomanyA.*;
import com.mycomanyB.*;
public class Something{
public static void main(String ... args){
// code goes here...
}
}
And the Something.java is inside the following structure...
A.jar
com/
mycompanyA/
A.class
Another.class
B.jar
com/
mycompanyB/
B.class
neededImage.gif
bin-folder/
org/
apache/
Something.java
To compile this code(Something.java) from command line I want to use the following command,
javac org/apache/Something.class
And for the compilation to be successful, I'll have to be just above bin-folder because...
- > Only then my default class path will be (.) and java would automatically include A.jar and B.jar(the other way is to add the jar files using -cp argument, which I want to avoid in this scenario)
- > And for the import org.mycompanyX to work I'll have to be in the (.) directory.
Are my assumptions correct about how java find jar contents imported in a source file?
I am looking for pure java API to be able to create/read outlook tasks.
Any open source API's available for the same.
Below I've attached a screenshot of how I've been naming my various java projects as I go through my current textbook. I'm not sure if I'm naming them correctly. I'm on chapter 5 of Introduction to Java Programming by Y. Daniel Liang and he is currently discussing methods and classes. I'm not sure what my projects would be considered (methods, classes, or something arbitrary like projects). Further, if I wrote a program, like loanCalculator215 for example, how could i call that in a different program, like primeNumbers?
View Replies View RelatedI have been given a task to scan the contents of a websites source code, and use delimiters to extract all hyperlinks from the site and display them. We havent been told anything about how to do this so after some looking around online this is what I have so far:
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.MalformedURLException;
import java.net.URL;
import java.util.Scanner;
[Code] ....
So my program can extract each line from the source code of a website and display it, but realistically I want it to extract each WORD as such from the source code rather than every line. I've looked around online but I don't really know how it's done because I keep getting errors when I use input.read();
How to make it extract each word from the source code?
Why is this not valid in java:
Both uses public with the same class/interface name.
Test.java:
public class Test implements Test{
/// Some codes
}
public interface Test {
///Some methods
}
I have an application separated into three different projects - core, command line version and Web UI version.
Core contains all the business logic in several services classes. Command line version and Web UI version both uses the core project services.
Command line have main class which call services from core. Web UI version is Spring base application using same services from core.
Java Code:
CoreProject
- src
- Service Classes (code here use thirdParty jars and core_file.txt)
- lib
- thirdParty.jar
- core_file.txt mh_sh_highlight_all('java');
[Code] ....
Now I want to give two separate versions to client.
Command line version to run as service in Windows andUI version to deploy in their server.
With above structure I create the cmdline.jar but when I am trying to run with
Java Code: java -jar cmdline.jar mh_sh_highlight_all('java');
I am getting java.lang.NoClassDefFoundError exception for the service classes in core. So my question is how to pack/generate jar for this kind of distribution?
How to deploy Java Swing application as windows software. I have tried the following to do this :
I have created jar file for my project after that created exe file using Launch4j and Advanced installer, exe file produced by both software are working fine but those are placing the jar file inside that exe file, My problem is any one who has that exe file can extract and view the source code by decompiling java class file. Is there any way to deploy java application without decompiling the code.
I am trying to complete this question. I understand the most of it but I haven't go a clue to read in the file name.
Full question: Implement a program that reads in a Java source code file and checks to see if it has balanced {}brackets. Your program should use a stack, implemented as a linked list, to check the brackets.
NOTE: you can use a reference called top which points to the head of the list. Your program should run as a command line program and should take a filename as an argument and print one of BALANCED or NOT BALANCED.
For example: c:> java checkBalanced "myProgram.java" BALANCED
I was looking at the Sound API pages in the java tutorials. I was planning to use it to run wma files. Fortunately, for me, I found, soon into the tutorials, that these API DON'T support the type I have all of my files in (I have a ton of wma files but none of the libraries mentioned support them.)
I almost thought I heard JavaFx or whatever it's called does, but that sounds foreign and Netbeans lists it as a separate type of java in a way, so I don't know if it would be cross-platform or if it could work with the JavaSE API.) Nor do I know what JavaSX or whatever it's called is really, other than that it's more for internet than application.
If I wanted a JPanel or Applet acting as the content pane of a JFrame or being in a JFrame, could I use JavaFX (or whatever it's called) or some third party library (that I always tend to end up spending hours on trying to get it to find the jar files when I import them, so I hope I don't need too many jar files!!!! ) would it work with the JavaSE API?
I don't know much about Java and playing sounds (other than that there is a static method, I think under Toolkit, that will play a system beep) with programs.
However, I can see that that packages don't support certain types (so much for cross-platform!!!!!!! ) and also that a while back that Oracle took over and that they aren't really updating the Java Sound APIs really that much at all
So, without having to learn a whole new Java set of standards (assuming JavaFX or whatever it's called is a different set of standards from JavaSE), is there a way to play .wma?
That's all I seem to have on my computer.
(I suppose I could create new sounds, though if Oracle isn't updating the library, who knows if even that works anymore, but if you're trying to run a Java Media Player that runs lots of DIFFERENT sound file types, this seems a real setback. )
I heard you could convert them to MP3s (I heard there were free things that did it, but who knows if the things aren't filled with viruses that'll do it or, even if they're not, that they'll really mess up the quality of the sound and that I might lose the old .wma file in the process even if it doesn't corrupt the sound.)
But, even if I get a .mp3, I heard the main JavaSE libraries DON'T cover that either, though it was said it was easier to make it run them than .wma files.
MediaPlayer and the main JavaSE classes don't seem to be able to fit for this type of program (a java media player) that I was planning. Heck, they can't even play any music I have on my computer at all, media player or not.
I have made a program on BlueJ but need to transfer the class to a pen drive so that I can take it to school and show it to my teacher. How is this done
View Replies View RelatedI have a batch of files that I want to remove a common word from all of their filenames. I think I could bash my way through this if I had a linux machine, but I don't. Any tips on what classes I need for the files I want to rename (if any) would be great. I can handle the string changes, but searching a directory and renaming files is something I've never done with code before.
View Replies View RelatedMy friend has a youtube channel with 50.000 - 100.000 subscribers. I dont know the exact amount but he asked me to make a program for his subscribers. I made it in Java and it works perfectly fine but now i want to make it secure so people can't decompile it and read/change the code. Because ofcourse he also has viewers who can hack programs.
But i dont know how i can do that. I dont want to make the code hard to read. I already heard about program which adds lines of code without doing anything actually and programs making the code a lot more complicated. But thats not what i want, i want to make the Class files undecompilable so people cant decompile it to Java files again and read the code.
I know this is possible, Runescape for example is written in Java too and secured good enough in my opinion. I know there are fake Runescape games called private servers or something like that. But its not easy as downloading the game, decompiling it, connecting it to another server and you're done. A little kid can do that but i think its even possible that people just programmed Runescape again from scratch.So i want to make my program very hard to decompile or even impossible, i want it as impossible as possible.
I'v tried everything, i'v tried to create new path in enviornment variables i tried adding this path -->(C:Program FilesJavajdk1.8.0_20bin) to the end of the default path doesnt work i uninstalled and reinstalled and did the same thing over and it didnt work am i editing the files wrong ? what i do is write the hello world program in eclipse to make sure there arent any errors then copy and paste in note pad++ save it as a .java file and it doesnt work i tried save it in regular notepad as .java laso and it doesnt work iv done every thing i could possibly find on youtube is this stuff outdated ? is there a new way? this one one of the errors ill get
C:javat>javac helloworld.java
helloworld.java:1: error: '{' exp
public class helloworld.java {
^
And this is the code for that file im trying to compile
public class helloworld.java {
public static void main (String args[]){
System.out.println("hello world");
}
}
One challenging task in java i am facing is, batch printing of files in java .....
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