SortedMap
Introduction#
Introduction to sorted Map.
Introduction to sorted Map.
Keypoint :-
- SortedMap interface extends Map.
- entries are maintained in an ascending key order.
Methods of sorted Map :
- Comparator comparator( ).
- Object firstKey( ).
- SortedMap headMap(Object end).
- Object lastKey( ).
- SortedMap subMap(Object start, Object end).
- SortedMap tailMap(Object start).
Example
public static void main(String args[]) {
// Create a hash map
TreeMap tm = new TreeMap();
// Put elements to the map
tm.put("Zara", new Double(3434.34));
tm.put("Mahnaz", new Double(123.22));
tm.put("Ayan", new Double(1378.00));
tm.put("Daisy", new Double(99.22));
tm.put("Qadir", new Double(-19.08));
// Get a set of the entries
Set set = tm.entrySet();
// Get an iterator
Iterator i = set.iterator();
// Display elements
while(i.hasNext()) {
Map.Entry me = (Map.Entry)i.next();
System.out.print(me.getKey() + ": ");
System.out.println(me.getValue());
}
System.out.println();
// Deposit 1000 into Zara's account
double balance = ((Double)tm.get("Zara")).doubleValue();
tm.put("Zara", new Double(balance + 1000));
System.out.println("Zara's new balance: " + tm.get("Zara"));
}