How to implement Queue in Java?

Question

I have a folder with 1 ThMapInfratab1-2.exe file and 3 .txt files. If you run .exe file in any way(through command prompt,just double click and through any language) one Icon will be appear on Taskbar.

enter image description here

My .exe will be run 2-3 minutes.

Know I want to run these .exe file using Java.I found How to run .exe from Java technology.

My concept was, first I will find .txt file Names from the directory.finally I will get like this.

List<File> fileNames={"File1.txt","File2.txt","File3.txt"};

Know I want to run my .exe file 3 times because my fileNames length is equals to 3.For this I wrote the following code.

 //ExeFileProcess Function

 public void ExeternalFileProcessing(String DirectoryPath,String exeFileName,String inputFileName) throws IOException
 {
     String executableFileName = DirectoryPath+"/"+exeFileName;
     String inputFile=inputFileName;
     ProcessBuilder processBuilderObject=new ProcessBuilder(executableFileName,inputFile);
     File absoluteDirectory = new File(DirectoryPath);
     processBuilderObject.directory(absoluteDirectory);
     processBuilderObject.start();
     //processBuilderObject.wait();
 }

//Main Function code.

 public static void main(String[] args) throws IOException
 {
     ExternalFileExecutions ExternalFileExecutionsObject=new ExternalFileExecutions();
     for (int fileIndex = 0; fileIndex < fileNames.size(); fileIndex++) 
     {
         ExternalFileExecutionsObject.ExeternalFileProcessing("C:/Users/Infratab Bangalore/Desktop/Rod","ThMapInfratab1-2.exe",fileNames[fileIndex ]);
     }
 }

I evaluated above code, at a time 3 .exe processes are started.But I don't want like that. I want to run .exe file one by one(we need to monitor, whether the previous .exe process was done or not. once it's done it allows to next Iteration).

I tried with Wait().but it's not working.

I guess, for this I need to add some code in my ExeternalFileProcessing(). But I didn't get anything.

can anyone suggest me.

I hope, you understand, what My problem.

you are asking a lot of questions... are we coding your product?! :-p — Philipp Sander
– Philipp Sander, Commented Jul 24, 2013 at 14:28
@PhilippSander Actually I have only one problem,but I want to learn Java.so I divided my problem into function wise and I am trying to figure it out. But in every function I stuck in somewhere, I am asking help from StackoverFlow guys.because these guys are ready to help to anyone(even for starting guys). Finally I reached final stage of my problem. for this I am working from yesterday. because everytime, I don't want to base on any one. so first I am trying using Google, If I face any problem I am posting question in StackoverFlow. — ur truly friend
– ur truly friend, Commented Jul 24, 2013 at 14:37
truly firend it was no offense or anything! but if you're trying to learn jave i would recommend something simpler for the start — Philipp Sander
– Philipp Sander, Commented Jul 24, 2013 at 14:43

Mikita Belahlazau · Accepted Answer · 2013-07-24 14:31:28Z

2

ProcessBuilder.start method returns an instance of Process class. YOu can use waitFor method to wait until created process stops:

    ...
    Process process = processBuilderObject.start();
    process.waitFor();
}

processBuilderObject.wait() is a invocation of Object's wait method. It is used for concurrency and doesn't relate to processes at all.

answered Jul 24, 2013 at 14:31

Mikita Belahlazau

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3 Comments

ur truly friend Over a year ago

It's working great. I didn't understand one thing in your code. Process process = processBuilderObject.start();.What is Process(First Word) and process(second word) from above line. may be it's very question but I am new to Java side. so can you explain.

Mikita Belahlazau Over a year ago

@urtrulyfriend first Process is a type of variable and second process is a variable's name.

ur truly friend Over a year ago

Some times My .exe is taking 20-30 min for running,because The Evaluation time process was based on .txtfile. In this cases next for loop iteration also starting before stopping the previous .exe file execution.If the .txt size is small then .exe taking 2-3 min.this time working perfectly.But not working in case1(.txt size is big).

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