ArrayList<HashMap<String,String>> to String[]

Question

i have data fetched from my webservice in

ArrayList<HashMap<String,String>>

Now i want to convert each object of the above to

String[]

how do i do this? any help would be much appreciated!

• Niraj Adhikari: it contains data obtained from a webservice serving json data. i need to extract each field as a string array for populating them into different views like viwepagers and list views.
• Raghunandan: stackoverflow.com/questions/1090556/… this might help.
• Alberto: In the array you want to put hashmap's keys, values or both?
• Volodymyr Levytskyi: Please cover my tutorial on internal life of HashMap,ArrayList and other Java collection types here

Answer 1

try

ArrayList<HashMap<String, String>> test = new ArrayList<HashMap<String, String>>();
HashMap<String, String> n = new HashMap<String, String>();
n.put("a", "a");
n.put("b", "b");
test.add(n);
HashMap<String, String> m = test.get(0);//it will get the first HashMap Stored in array list 
String strArr[] = new String[m.size()];
int i = 0;
for (HashMap<String, String> hash : test) {
 for (String current : hash.values()) {
 strArr[i] = current;
 i++;
 }
}

Answer 2

The uses for an Hashmap should be an Index of HashValues for finding the values much faster. I don't know why you have Key and Values as Strings but if you only need the values you can do it like that:

ArrayList<HashMap<String, String>> test = new ArrayList<>();
String sum = "";
for (HashMap<String, String> hash : test) {
 for (String current : hash.values()) {
 sum = sum + current + "<#>";
 }
}
String[] arr = sum.split("<#>");

It's not a nice way but the request isn't it too ;)

Answer 3

 ArrayList<HashMap<String, String>> meterList = controller.getMeter();
HashMap<String, String> mtiti = meterList.get(0);//it will get the first HashMap Stored in array list
String[] strMeter = new String[mtiti.size()];
String meter = "";
for (HashMap<String, String> hash : meterList) {
 for (String current : hash.values()) {
 meter = meter + current + "<#>";
 }
}
String[] arr = meter.split("<#>");