Compiling files through Java File using command line

Question

I am looking at ways to compile java files and I know you can compile Java files from the command line using javac Test.java, but is there a way to pass this call to the command line?

Also is there a way to get the command line to compile .tar files in the same way... something like javac -tar Test.tar(passing command from java file).. or what would be the best way to do this?

Sorry im not very good at cmd commands

I'll leave this here as others have already posted correct answers:docs.oracle.com/javase/1.5.0/docs/api/java/lang/Runtime.html — Colin D
– Colin D, Commented Jul 19, 2012 at 17:50
I want to pass these arguments from java to the command prompt — Hip Hip Array
– Hip Hip Array, Commented Jul 19, 2012 at 17:51

Bertil Chapuis · Accepted Answer · 2012-07-19 20:08:58Z

5

Java provides an interface to invoke the compilers from programs.

JavaCompiler compiler = ToolProvider
    .getSystemJavaCompiler();

StandardJavaFileManager fileManager = compiler
    .getStandardFileManager(null, null, null);

Iterable<? extends JavaFileObject> compilationUnits = fileManager
    .getJavaFileObjectsFromStrings(Arrays.asList("MyClass.java"));

compiler.getTask(null, fileManager, null, null, null, compilationUnits).call();

fileManager.close();

answered Jul 19, 2012 at 20:08

Bertil Chapuis

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2 Comments

Hip Hip Array Over a year ago

I was actually looking at this way of compiling projects and it seems to be compiling but when you try to compile projects that have multiple classes it is not recognizing all the classes (ie. one class that is calling another), it is compiling all the classes but giving out about the import statements for the other classes and anywhere where a method from the other class is called... do you know why this would be happening?

Bertil Chapuis Over a year ago

You probably have to set the classpath option.

Rob Wagner · Accepted Answer · 2012-07-19 17:49:10Z

3

Runtime rt = Runtime.getRuntime();
Process pr = rt.exec("javac Test.java");

answered Jul 19, 2012 at 17:49

Rob Wagner

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ᴇʟᴇvᴀтᴇ · Accepted Answer · 2012-07-19 17:49:48Z

3

You can run system commands from Java using the Runtime class, e.g.

Process p = Runtime.getRuntime().exec("javac Test.java"); 
p.waitFor(); 

BufferedReader reader = new BufferedReader(new InputStreamReader(p.getInputStream())); 
String line; 
while((line = reader.readLine()) != null) { 
    System.out.println(line); 
}

answered Jul 19, 2012 at 17:49

ᴇʟᴇvᴀтᴇ

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2 Comments

Hip Hip Array Over a year ago

just playing around with it here, and just wondering can you put this in a method and call it when you want of does it have to be inside the main method? ...'public static void main(String[] args)

ᴇʟᴇvᴀтᴇ Over a year ago

It can be in a method. public void execute(String command) throws Exception { ... } then you can call execute('java Test.java')

Mitch Connor · Accepted Answer · 2012-07-19 17:50:22Z

2

I believe you are asking how to pass a compile command to the command line from java file to compile another java file. This would be done like you would execute any other command to the command line. In my opinion I use process builder for everything, however, this is a great example of when to use .exec() and pass your command line compile command as a string.

answered Jul 19, 2012 at 17:50

Mitch Connor

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Kumar Vivek Mitra · Accepted Answer · 2012-07-19 17:55:12Z

2

Try this....

Process p = Runtime.getRuntime().exec("javac Test.java");

answered Jul 19, 2012 at 17:55

Kumar Vivek Mitra

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