Add example of nested arrays and Python tuple/list as func arg

examples/arraylists/arraylist.java

@@ -0,0 +1,48 @@
+// javac arraylist.java
+// java arraylist
+
+import java.lang.String;
+import java.util.List;
+import java.util.Arrays;
+import java.util.ArrayList;
+
+
+public class arraylist {
+    public static void main(String[] args) {
+        // Object based empty ArrayList
+        ArrayList<Object> jlist = new ArrayList<Object>();
+        System.out.println(jlist);
+        System.out.println(jlist.size());
+
+        // String array
+        String[] str_array = {"a", "b", "c"};
+        System.out.println(str_array.toString());
+        System.out.println(str_array.length);
+
+        // add the array of strings to the list
+        jlist.add(str_array);
+        System.out.println(jlist.toString());
+        System.out.println(jlist.size());
+
+        // create a new ArrayList from String array
+        ArrayList<Object> str_list = new ArrayList<Object>(
+            Arrays.asList(str_array.toString())
+        );
+        jlist.add(str_list);
+        System.out.println(jlist.toString());
+        System.out.println(jlist.size());
+
+        // add an empty Object to ArrayList
+        jlist.add(new Object());
+        System.out.println(jlist.toString());
+        System.out.println(jlist.size());
+
+        // new ArrayList to wrap everything up
+        ArrayList plain_list = new ArrayList();
+        plain_list.add(str_array);
+        plain_list.add(str_list);
+        plain_list.add(jlist);
+        System.out.println(plain_list.toString());
+        System.out.println(plain_list.size());
+    }
+}

examples/arraylists/arraylist.py

@@ -0,0 +1,54 @@
+# pylint: disable=invalid-name
+'''
+Example of nested ArrayList and passing empty tuple/list to Java functions.
+'''
+
+from __future__ import unicode_literals, print_function
+from jnius import autoclass, cast  # pylint: disable=import-error
+
+String = autoclass('java.lang.String')
+List = autoclass('java.util.List')
+Arrays = autoclass('java.util.Arrays')
+ArrayList = autoclass('java.util.ArrayList')
+JavaArray = autoclass('java.lang.reflect.Array')
+Object = autoclass('java.lang.Object')
+
+
+def sep_print(*args):
+    '''
+    Separate args because in <80char console (e.g. Windows)
+    is the output barely readable with [[, @, ;, ,, ...
+    '''
+    print(*args)
+    print('-' * 10)
+
+
+# Object based empty ArrayList
+jlist = ArrayList()
+sep_print(jlist, jlist.toString(), len(jlist))
+
+# String array
+str_array = JavaArray.newInstance(String, 3)
+for i, item in enumerate(('a', 'b', 'c')):
+    str_array[i] = String(item)
+sep_print(str_array, len(str_array))
+
+# add the array of strings to the list
+jlist.add(str_array)
+sep_print(jlist, jlist.toString(), len(jlist))
+
+# create a new ArrayList from String array
+str_list = ArrayList(Arrays.asList(str_array))
+jlist.add(str_list)
+sep_print(jlist, jlist.toString(), len(jlist))
+
+# add an empty Object to ArrayList
+jlist.add(Object())
+sep_print(jlist, jlist.toString(), len(jlist))
+
+# new ArrayList to wrap everything up
+plain_list = ArrayList()
+plain_list.add(str_array)
+plain_list.add(str_list)
+plain_list.add(jlist)
+sep_print(plain_list, plain_list.toString(), len(plain_list))