java.util.TreeSet.subSet() Method

Description

The subSet(E fromElement,E toElement) method is used to return a view of the portion of this set whose elements range from fromElement, inclusive, to toElement, exclusive.

Declaration

Following is the declaration for java.util.TreeSet.subSet() method.

public SortedSet<E> subSet(E fromElement,E toElement)

Parameters

• fromElement − This is the low endpoint (inclusive) of the returned set.

• toElement − This is the high endpoint (exclusive) of the returned set.

Return Value

The method call returns a view of the portion of this set whose elements range from fromElement, inclusive, to toElement, exclusive.

Exception

• ClassCastException − This is thrown if fromElement and toElement cannot be compared to one another using this set's comparator.

• NullPointerException − This is thrown if fromElement or toElement is null and this set uses natural ordering, or its comparator does not permit null elements.

• IllegalArgumentException − This is thrown if fromElement is greater than toElement; or if this set itself has a restricted range, and fromElement or toElement lies outside the bounds of the range.

Example

The following example shows the usage of java.util.TreeSet.subSet() method.

package com.tutorialspoint;

import java.util.TreeSet;
import java.util.Iterator;

public class TreeSetDemo {
   public static void main(String[] args) {

      // creating a TreeSet 
      TreeSet <Integer>treeadd = new TreeSet<Integer>();
      TreeSet <Integer>treesubset = new TreeSet<Integer>();

      // adding in the tree set
      treeadd.add(1);
      treeadd.add(2);
      treeadd.add(3);
      treeadd.add(4);
      treeadd.add(5);
      treeadd.add(6);
      treeadd.add(7);
      treeadd.add(8);

      // creating subset
      treesubset = (TreeSet)treeadd.subSet(3,7); 

      // create iterator
      Iterator iterator;
      iterator = treesubset.iterator();

      // displaying the Tree set data
      System.out.println("Tree subset data: ");     
      
      while (iterator.hasNext()) {
         System.out.println(iterator.next() + " ");
      }
   }    
}

Let us compile and run the above program, this will produce the following result.

Tree subset data: 
3 
4 
5 
6

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