Chapter 31: SortedMap

20/09/2023
Java

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Introduction to sorted Map.

Section 31.1: 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”));
}

Sandeep Rana

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