How to Call the Python Method From Java

Complex applications typically are split into multiple modules, as a good software engineering practice. Sometimes those modules are implemented by different people and even on different programming languages; in those cases you need mechanisms to transfer control from code written in one language to code written in another language. In particular, you can call a method written in Python from Java code by launching the Python interpreter parameterized with the name of the method you need to run.

Instructions

1. Include the following line at the beginning of your Java code:

   import java.io.*;

2. Build a Java string including the name of the Python method you want to run as in the following sample code:

   String argsToPythonInterpreter = "payroll";

3. Transfer control to the Python interpreter from the Java program, while instructing the interpreter to call the designated method:

   Runtime rt = Runtime.getRuntime();

   Process pr = rt.exec("python -m "+argsToPythonInterpreter);

   pr.waitFor();

References

• Oracle: Java: Class RunTime