Here is the code:
HashMap<String, Integer> arr = new HashMap<String, Integer>();
arr.put("one", 1);
arr.put("two", 2);
arr.put("three", 3);
how can I to get all strings as String[] array and all integers as Int[] array?
thanks to all! all is correct, if somebody has the same Problemm, answer is:
String[] entry =(String[])arr.keySet().toArray(new String[arr.size()]);
Integer[] entry_values =(Integer[])arr.values().toArray(new Integer[arr.size()]);
1) arr.keySet().toArray(new String[arr.size()]);
2) arr.values().toArray(new Integer[arr.size()]);
You can use the keySet() and values() methods to get the strings and integers alone. They both return collections, so you can then call toArray on them.
There is no Method to get your Items by their type, but by their function in the map.
HashMap<String, Integer> arr = new HashMap<String, Integer>();
Set<String> keys = arr.keySet(); // all keys.
Collection<Integer> values = arr.values(); //all values.
you can call toArray() on both of your results. Add a new Array as argument to define the type of the result.
String[] strings = keys.toArray(new String[arr.size()]);
Integer[] ints = values.toArray(new Integer[arr.size()]);
Try this out:
String strArr[] = new String[arr.size()];
arr.keySet().toArray(strArr); // Populate the String array with map keys
Integer intArr[] = new Integer[arr.size()];
arr.values().toArray(intArr); // Populate the Int array with map values
