This section contains the detail about the SortedSet in java.
The SortedSet
The Sorted Set inherits the behavior of Set by extending it and sort the set in increasing order. If there is no element in invoking Set, 'NoSuchElementException' is thrown by many methods. A 'ClassCastException' is thrown when an object is incompatible with the elements in a set. A 'NullPointerException' is thrown if an attempt is made to use a null object and null is not allowed in the set.
| Methods | Description |
| Comparator comparator( ) | Returns the invoking sorted set's comparator. If the natural ordering is used for this set, null is returned. |
| Object first( ) | Returns the first element in the invoking sorted set. |
| SortedSet headSet(Object end) | Returns a SortedSet containing those elements less than end that are contained in the invoking sorted set. Elements in the returned sorted set are also referenced by the invoking sorted set. |
| Object last( ) | Returns the last element in the invoking sorted set. |
| SortedSet subSet(Object start, Object end) | Returns a SortedSet that includes those elements between start and end.1. Elements in the returned collection are also referenced by the invoking object. |
| SortedSet tailSet(Object start) | Returns a SortedSet that contains those elements greater than or equal to start that are contained in the sorted set. Elements in the returned set are also referenced by the invoking object. |
Example :
import java.util.*;
public class SortedSetExample {
public static void main(String[] args) {
// Create the sorted set
SortedSet SS = new TreeSet();
// Add elements to the set
SS.add("Y");
SS.add("X");
SS.add("Z");
// Iterating over the elements in the set
Iterator IT = SS.iterator();
while (IT.hasNext()) {
// Get element
Object element = IT.next();
System.out.println(element.toString());
}
}
}
Output :
|
C:\Program Files\Java\jdk1.6.0_18\bin>java SortedSetExample X Y Z |
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