SortedMap (interface) example in java Collection Framework
In this example I will show you how you can use SortedMap interface in your Java
application.
A SortedMap is a map that maintains its entries in ascending order, sorted
according to the
keys' natural order, or according to a Comparator
provided at SortedMap creation time. (Natural order and
Comparators are discussed in the section on Object Ordering In addition to the normal
Map operations, the Map interface provides
operations for:
-
Range-view: Performs arbitrary range operations on the sorted
map.
-
Endpoints: Returns the first or last key in the sorted map.
-
Comparator access: Returns the
Comparator used to
sort the map (if any).
Here is the code of program :
import java.util.*;
public class SortedMapExample{
public static void main(String[] args) {
SortedMap map = new TreeMap();
// Add some elements:
map.put("2", "Two");
map.put("1", "One");
map.put("5", "Five");
map.put("4", "Four");
map.put("3", "Three");
// Display the lowest key:
System.out.println("The lowest key value is: " + map.firstKey());
// Display the highest key:
System.out.println("The highest key value is: " + map.lastKey());
// Display All key value
System.out.println("All key value is:\n" + map);
// Display the headMap:
System.out.println("The head map is:\n" + map.headMap("4"));
// Display the tailMap:
System.out.println("The tail map is:\n" + map.tailMap("4"));
// keySet method returns a Set view of the keys contained in this map.
Iterator iterator = map.keySet().iterator();
while (iterator.hasNext()) {
Object key = iterator.next();
System.out.println("key : " + key + " value :" + map.get(key));
}
}
}
|
Output:
| The highest key value is: 5
All key value is:
{1=One, 2=Two, 3=Three, 4=Four, 5=Five}
The head map is:
{1=One, 2=Two, 3=Three}
The tail map is:
{4=Four, 5=Five}
key : 1 value :One
key : 2 value :Two
key : 3 value :Three
key : 4 value :Four
key : 5 value :Five |
Download
code
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