Java TreeSet Collection

What is TreeSetCollection in java?

  • TreeSet class is one of the collection class in java.
  • TreeSet class implements the Set interface.
  • TreeSet class is used to create a collection that uses a tree for storage. Objects are stored in sorted order default ascending order.
  • Accessing elements in TreeSet are quite fast when storing large amounts of sorted information.

TreeSet Constructors Types

TreeSet()

This constructor builds an empty TreeSet that will be sorted in ascending order based on natural order of elements.

TreeSet(Collection collection)

This constructor initializes the elements of the collection.

TreeSet(Comparator comparator)

This constructor builds an empty TreeSet that will be sorted based on comparator specified.

HashSet(SortedSet sortedSet)

Initializes TreeSet with SortedSet elements.

TreeSet Methods

add method

add method is used to add element in the TreeSet.

add(object)

contains method

contains method is used to check whether element exists in TreeSetor not. returns true if object exist in TreeSet, otherwise returns false.

contains(object)

remove method

remove method is used to remove element in the TreeSet.

remove(object)

size method

size method is used to return the number of elements in the TreeSet.

size()

Creating TreeSet and Adding Elements in Java Program

// Codingpointer Demonstrates TreeSet
                                                                                
import java.util.*;                                                             
                                                                                
class TreeSetTest {                                                          
 public static void main(String args[]) {                                       
  TreeSet ts = new TreeSet();
  //Add elements
  ts.add("B");
  ts.add("E");
  ts.add("D");
  ts.add("E");
  System.out.println(ts);  
 }                                                                              
}           
Output:
$ java TreeSetTest     
[B, D, E]   

Remove Element in HashSet

import java.util.*;                                                             
                                                                                
class TreeSetTest {                                                          
 public static void main(String args[]) {                                       
  TreeSet ts = new TreeSet();
  //Add elements
  ts.add("B");
  ts.add("E");
  ts.add("D");
  ts.add("E");
  System.out.println(ts);  
  System.out.println("TreeSet contains 'B':" + ts.contains("B"));         
  System.out.println("TreeSet contains 'R':" + ts.contains("R"));
  System.out.println("Size: "+ts.size());
  ts.remove("E");
  System.out.println("after removed 'E'");
  System.out.println(ts);
  System.out.println("Size: "+ts.size());
 }                                                                              
}
Output:
java TreeSetTest          
[B, D, E]                              
TreeSet contains 'B':true                            
TreeSet contains 'R':false                                      
Size: 3                               
after removed 'E'                             
[B, D]                          
Size: 2  

Adding Element of Different Data Types

import java.util.*;                                                             
                                                                                
class TreeSetTest {                                                          
 public static void main(String args[]) {                                       
  TreeSet ts = new TreeSet();
  //Add elements
  ts.add("B");
  ts.add("E");
  ts.add(2);
  ts.add("E");
  System.out.println(ts);  
  System.out.println("TreeSet contains 'B':" + ts.contains("B"));         
  System.out.println("TreeSet contains 'R':" + ts.contains("R"));
  System.out.println("Size: "+ts.size());
  ts.remove("E");
  System.out.println("after removed 'E'");
  System.out.println(ts);
  System.out.println("Size: "+ts.size());
 }                                                                              
}
Output:
$ java TreeSetTest
Exception in thread "main" java.lang.ClassCastException: java.base/java.lang.String cannot be cast to java.base/java.lang.Integer
        at java.base/java.lang.Integer.compareTo(Unknown Source)
        at java.base/java.util.TreeMap.put(Unknown Source)
        at java.base/java.util.TreeSet.add(Unknown Source)
        at TreeSetTest.main(TreeSetTest.java:9) 

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