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I want to create a program that can Compile a .java file to a .class file like it is done on this website: Innovation website

My questions are:

  • Is there an library i can use to do this?
  • Where can I get this Library?
  • If there isn't a library for this then how can i do this?
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3
  • It is compiling the files. You have to get the files and pass them as arguments to the jdk. I don't think there is a library to do this. This is very straight forward once you know how java works. Commented Jan 11, 2015 at 13:10
  • @luanjot It's there in JDK since 1.6. Commented Jan 11, 2015 at 13:19
  • possible duplicate of How to run Java program in command prompt Commented Jan 11, 2015 at 13:25

3 Answers 3

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   JavaCompiler javac = ToolProvider.getSystemJavaCompiler();

The javadoc for JavaCompiler shows how to work and compile with this JDK facility. One snippet from there:

   File[] files1 = ... ; // input for first compilation task

   JavaCompiler compiler = ToolProvider.getSystemJavaCompiler();
   StandardJavaFileManager fileManager = compiler.getStandardFileManager(null, null, null);

   Iterable<? extends JavaFileObject> compilationUnits1 =
       fileManager.getJavaFileObjectsFromFiles(Arrays.asList(files1));
   compiler.getTask(null, fileManager, null, null, null, compilationUnits1).call();

It is by no means a simple task. But a general method for invoking a Java compiler via the shell - with all the trimmings - isn't easy either, and this, then, also applies to calls via Process.

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1 Comment

Question: how to provide the target location of the class file to be created? Is there created any file in thi ssolution???
2

You can do this using the Process class as

Process pro=Runtime.getRuntime().exec("javac FileName.java", null, new File("\path"));
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5 Comments

The /path is the output file path right?
No its input file FileName.java path, output file will be generated at the same location
O right is there an way to move the files to another directory using the process?
Nvm I just had to add -d /outputPath to the process
Ya exactly! -d <directory> to generate it to specific directory
0

use ProcessBuilder to execute system commands.

Install JDK and form command "javac JavaFileName" pass this to ProcessBuilder constructor and call method start()

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1 Comment

We have seen this often enough in the referenced duplicates.

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