Calling the Python method in Java

1. Execute python statements directly in the Java class

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Import javax.script.*;
Import Org.python.util.PythonInterpreter;
Import java.io.*;
Import static java.lang.system.*;

public class Firstjavascript
{
public static void Main (String args[])
{
Pythoninterpreter interpreter = new Pythoninterpreter ();
Interpreter.exec ("days=" (' MoD ', ' Tue ', ' Wed ', ' Thu ', ' Fri ', ' Sat ', ' Sun ');
Interpreter.exec ("Print days[1];");
}//main
}

The result is Tue, which is displayed in the console, which is called directly.

2. Call the functions in the native Python script in Java:
First, create a python script named: my_utils.py

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Def adder (A, B):
Return a + b

Then build a Java class that you can use to test,

Java Class Code Firstjavascript:

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Import javax.script.*;
Import org.python.core.PyFunction;
Import Org.python.core.PyInteger;
Import Org.python.core.PyObject;
Import Org.python.util.PythonInterpreter;
Import java.io.*;
Import static java.lang.system.*;

public class Firstjavascript
{
public static void Main (String args[])
{
Pythoninterpreter interpreter = new Pythoninterpreter ();
Interpreter.execfile ("c:\\python27\\programs\\my_utils.py");//path, script name
pyfunction func = (pyfunction) interpreter.get ("Adder", pyfunction.class);//adder python function name
int a =, b = 2;
Pyobject pyobj = func.__call__ (New Pyinteger (a), new Pyinteger (b));//pass value, a B
System.out.println ("Anwser =" + pyobj.tostring ());
}//main
}

The resulting result is: Anwser = 2012

3. Execute the Python script directly using Java,
Create a script inputpy

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#open files

print ' Hello '
number=[3,5,2,0,6]
Print number
Number.sort ()
Print number
Number.append (0)
Print number
Print Number.count (0)
Print Number.index (5)

To create a Java class, call this script:

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Import javax.script.*;
Import org.python.core.PyFunction;
Import Org.python.core.PyInteger;
Import Org.python.core.PyObject;
Import Org.python.util.PythonInterpreter;
Import java.io.*;
Import static java.lang.system.*;

public class Firstjavascript
{
public static void Main (String args[])
{
Pythoninterpreter interpreter = new Pythoninterpreter ();
Interpreter.execfile ("c:\\python27\\programs\\input.py");
}//main
}

The resulting results are:

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Hello
[3, 5, 2, 0, 6]
[0, 2, 3, 5, 6]
[0, 2, 3, 5, 6, 0]
2
3

