Easy learning with example program codes

SortedSet interface in java

SortedSet interface:

SortedSet interface extends Set interface. SortedSet interface maintain ascending order in its elements.

 Note: SortedSet interface declares its own methods in addition of methods declared in Set interface.

 Commonly used methods of SortedSet interface:

1. comparator(): Returns comparator for this sorted set. It returns null if the natural ordering is used for this set.

Syntax: public Comparator comparator().

2. first(): Returns the first element in this sorted set.

Syntax: public Object first().

3. headSet(Object end): Returns a SortedSet containing those elements less than end that are contained in this sorted set.

Syntax: public SortedSet headSet(Object end).

4. last(): Returns the last element in this sorted set.

Syntax: public Object last().

5. subSet(Object start, Object end): Returns a SortedSet containing those elements between start and end -1.

Syntax: public SortedSet subSet(Object start, Object end).

6. tailSet(Object start): Returns a SortedSet that contains those elements greater than or equal to start that are contained in this sorted set.

Syntax: public SortedSet tailSet(Object start).

 A simple example of TreeSet class to explain few methods of SortedSet interface.

import java.util.Iterator;
import java.util.Set;
import java.util.TreeSet;
 * This class is used to show the TreeSet functionality.
 * @author codesjava
public class TreeSetTest {
	public static void main(String args[]){
		//Create TreeSet object.
		Set treeSet = new TreeSet();
		//Add objects to the HashSet.
		//Print the TreeSet object.
		System.out.println("TreeSet elements:");
		//Print the TreeSet elements using iterator.
		Iterator iterator=treeSet.iterator();
		System.out.println("TreeSet elements using iterator:");


TreeSet elements:
[Munish, Pardeep, Roxy, Sandy, Sunil]
TreeSet elements using iterator:

Download this example.
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