Re: [Jython-users] java.util.map Compatible data structure in python

[Jeff E. <jem...@fr...>]

That's correct, unfortunately PyDictionary does not
implement java.util.Map.

You need to copy the dictionary to a Java map before
passing it to Java code.

def dictToJavaMap(dict):
  import java
  javaMap =java.util.HashMap()
  for i in dict.items():
    javaMap[i[0]]=i[1]
  return javaMap



Heshan Suriyaarachchi wrote:
> Hi,
>   I am trying to execute the below java code.But when I try to assign the
> dictionary to map it gives an classcast exception as below
> 
> Exception in thread "main" java.lang.ClassCastException:
> org.python.core.PyDictionary cannot be cast to java.util.Map
> 
> 
> # myfile.py
> # method which returns a Dictionary
> def getDictionary():
>     Dictionary2 = {}
>     Dictionary2['add'] = {'returns': 'int', 'operationName': 'add', 'var1':
> 'integer', 'var2': 'integer'}
>     Dictionary2['deduct'] = {'returns': 'double', 'operationName': 'deduct',
> 'var1': 'integer', 'var2': 'integer'}
>     Dictionary2['f'] = {'a': 'double', 'returns': 'double', 'operationName':
> 'f'}
>     return Dictionary2
> 
> # test.java
> # main method which calls the above method
> public static void main(String args []) throws PyException {
>         System.out.println("testing 123");
>         PySystemState.initialize();
>         PythonInterpreter interp =  new PythonInterpreter();
>         interp.exec("import sys");
>         interp.exec("print sys.path");
> 
>         String str3 =
> "/home/heshan/workspace/IdeaProjects/PYtest/src/essentialScripts/myfile.py";
>         interp.execfile(str3);
>         PyObject obj = interp.eval("getDictionary()");
>         Map map = (Map) obj;
> 
>         Iterator k = map.keySet().iterator();
>             while (k.hasNext()) {
>               String key = (String) k.next();
>               System.out.println("Key " + key + "; Value " +
>                 (String) map.get(key));
>             }
> }
> 
> 
> 
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