import java.io.*;
import java.util.*;
class GFG {
public static void main(String[] args) {
flattener("", getJson());
}
static void flattener(String parentKey, Map<String, Object> nodes) {
for (Map.Entry<String, Object> entry : nodes.entrySet()) {
String key = entry.getKey();
if (isPrimitive(entry.getValue())) {
System.out.println(parentKey + getSeparator(parentKey) + key + " : " + entry.getValue());
} else {
if (entry.getValue() instanceof Map) {
flattener(parentKey + getSeparator(parentKey) + key, (Map<String, Object>) entry.getValue());
} else if (entry.getValue() instanceof List) {
flattener(parentKey + getSeparator(parentKey) + key, convertToMap((List<Object>) entry.getValue()));
}
}
}
}
static String getSeparator(String parentKey) {
return parentKey.isEmpty() ? "" : ".";
}
static Map<String, Object> convertToMap(List<Object> arr) {
Map<String, Object> map = new HashMap<>();
for (int i = 0; i < arr.size(); i++) {
map.put(String.valueOf(i), arr.get(i));
}
return map;
}
static boolean isPrimitive(Object o) {
return o instanceof Number || o instanceof String || o instanceof Boolean;
}
public static Map<String, Object> getJson() {
Map<String, Object> jsonData = new HashMap<>();
jsonData.put("name", "john doe");
Map<String, Object> details = new HashMap<>();
details.put("a", 1);
details.put("b", 2);
details.put("c", 3);
ArrayList<Object> dArray = new ArrayList<>();
Map<String, Object> dObject = new HashMap<>();
dObject.put("a", 1);
dArray.add(dObject);
dArray.add(5);
dArray.add("f");
details.put("d", dArray);
jsonData.put("details", details);
return jsonData;
}
}