Run a java program from command line

Admittedly, I could just dir that directory without needing to cd to it, but this is only an example:. Note also that I'm using a ProcessBuilder to run the command. Amongst other things, this allows me to redirect the process's standard error into its standard output, by calling redirectErrorStream true. Doing so gives me only one stream to read from. It is important that you split the command and all arguments in separate strings of the string array otherwise they will not be provided correctly by the ProcessBuilder API.

The easiest way would be to use Runtime. However, there is no executable called cd , because it can't be implemented in a separate process. The one case where the current working directory matters is executing an external process using ProcessBuilder or Runtime. In those cases you can specify the working directory to use for the newly started process explicitly.

Once you get the reference to Process, you can call getOutpuStream on it to get the standard input of the cmd prompt. Then you can send any command over the stream using write method as with any other stream. Note that it is process. Similarly, to get the output of any command, you will need to call getInputStream and then read over this as any other input stream.

You can't run cd this way, because cd isn't a real program; it's a built-in part of the command-line, and all it does is change the command-line's environment. It doesn't make sense to run it in a subprocess, because then you're changing that subprocess's environment — but that subprocess closes immediately, discarding its environment.

The simplest and shortest way is to use CmdTool library. You can find more examples here. Here the value adder is use of ampersands to batch commands and correct format for change drive with cd. Stack Overflow for Teams — Collaborate and share knowledge with a private group.

Create a free Team What is Teams? Collectives on Stack Overflow. Learn more. Run cmd commands through Java Ask Question. Asked 8 years, 10 months ago. Active 1 year ago. Viewed k times. Yassin Hajaj Reham Reham 1, 6 6 gold badges 20 20 silver badges 44 44 bronze badges. There is some code here - viralpatel. Add a comment. Active Oldest Votes. Copy the full path and write it in the command line like this.

Step 4 : After compilation, the. We can now run the program. To run the program, type the below command and press Enter:.

You will be able to see the result displayed on the output. Note that you should not add the. What Is JUnit Testing? December 16, October 10, admin 0 How to get the index of an element in a list in Java November 7, October 9, admin 0 Leave a Reply Cancel reply Your email address will not be published. May 24, October 12, admin 0 Comments compile java project from command line , how to run java program in cmd using notepad , how to run java program in command prompt , how to run java program in terminal , how to run java program in windows 10 , java command line , mac , run java from command line mac.

How to compile and run the above program Prerequisite: You must install Java on your system. To run : java CopyFile. If you're having an issue resulting with "could not find or load main class" you may not have jre in your path. Have a look at this question: Could not find or load main class. This likely breaks when you upgrade your JDK installation but you have access to all the command line tools now.

Follow comments above about how to compile the file "javac MyFile. Full documentation for JShell can be found here. Now with JDK 9 onwards , you can just use java to get that executed. In order to execute "Hello.

Stack Overflow for Teams — Collaborate and share knowledge with a private group. Create a free Team What is Teams? Collectives on Stack Overflow. Learn more. How do I run a Java program from the command line on Windows? Ask Question. Asked 8 years, 8 months ago. Active 2 years, 7 months ago. Viewed 1. I'm trying to execute a Java program from the command line in Windows. Here is my code: import java.

File; import java. FileInputStream; import java. FileOutputStream; import java. IOException; import java. InputStream; import java. Bob Jarvis - Reinstate Monica Elizabeth Turner Elizabeth Turner 2, 3 3 gold badges 13 13 silver badges 11 11 bronze badges.

I'm at the command line now, do I need to save my txt files in the same folder as the program for them to be invoked? What package does CopyFile reside — MadProgrammer. Then run the commands I wrote above from the same folder in which CopyFile. Show 2 more comments. Active Oldest Votes. You should see nothing but the next system prompt You should then see your program output.

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