Java collection HashSet and TreeSet

Java collection HashSet and TreeSet

How can we used HashSet and TreeSet in the both Example?

View Answers

June 22, 2012 at 6:11 PM

import java.util.HashSet;
import java.util.Set;
import java.util.TreeSet;


 public class SetsExample{
 public static void main(String args[]){
     Set<String> set1 = new HashSet<String>();
     set1.add("B");
     set1.add("A");
     set1.add("C");
     set1.add("A"); //A is a duplicate value
     System.out.println("Set is " + set1);
     set1.remove("C");
     System.out.println("Set1 after removing c is " + set1);
     int size=set1.size();
     System.out.println("Size of set1 after adding duplicate item is " + size);
     System.out.println("Is set1 contains a " + set1);
     System.out.println("Is set1 contains c " + set1.contains("C"));
     Set<String> set2 = new TreeSet<String>();
     set2.add("E");
     set2.add("F");
     set2.add("G");
     System.out.println("Set2 is " + set2);
     set2.addAll(set1);
     System.out.println("Set2 is after mergine set1 element " + set2);
     set2.removeAll(set1);
     System.out.println("Set is after deleting set1 element " + set2);
     set2.addAll(set1);
     set2.retainAll(set1);
     System.out.println("Set2 is after deleting all element except set1 element " + set2);

 }
}

Output:-

Set is [A, B, C]
Set1 after removing c is [A, B]
Size of set1 after adding duplicate item is 2
Is set1 contains a [A, B]
Is set1 contains c false
Set2 is [E, F, G]
Set2 is after mergine set1 element [A, B, E, F, G]
Set is after deleting set1 element [E, F, G]
Set2 is after deleting all element except set1 element [A, B]

Description:- The above example demonstrates you the Set interface. Since Set is an interface, you need to instantiate a concrete implementation of the interface in order to use it. Here Set is implemented by its two subclasses HashSet and TreeSet. Now using the add() method, we have added elements to HashSet. Set does not accept duplicate values. So here we have checked whether the added elements are duplicate or not. Then we have removed one Element from the HashSet by using the method remove(). Now we have created another object by implementing Set-using TreeSet and add elements to the tree set. Using the addAll() method, we have added the elements of set1 to set2 and using the method removeAll(), we have removed all elements from set2.

Ads









Related Tutorials/Questions & Answers:
Java collection HashSet and TreeSet
Java collection HashSet and TreeSet   How can we used HashSet and TreeSet in the both Example?   import java.util.HashSet; import... two subclasses HashSet and TreeSet. Now using the add() method, we have added
Java Collection-TreeSet
Java Collection-TreeSet  What is TreeSet in Java Collection?  ...){ TreeSet ts = new TreeSet(); ts.add("B"); ts.add("D...:- The above program demonstrates you the concept of TreeSet. Here we have created
Advertisements
Java collection HashSet
Java collection HashSet  How can we use HashSet in java program?   The hashSet class is used to create a collection and store it in a hash table. Each collection refer to a unique value. import java.util.Collections
Java HashSet Collection problem
Java HashSet Collection problem  Here's how the HashSet works... the concept behind this??   In your code, HashSet stores the values...;Prac>(); So, while adding the object of Prac using add method of hashset, it get
Java Collection : TreeSet Example
Java Collection : TreeSet Example This tutorial contains description of  TreeSet with example. TreeSet  : TreeSet class is defined in java.util... constructor - TreeSet(), TreeSet(Collection c), TreeSet(Comparator c
What is HashSet in java
In following example we will discuss about HashSet in Java. The HashSet class... add(), remove(),size() and test the element of the collection. The HashSet...( ) HashSet(Collection x) HashSet(int capacity) The HashSet() constructor
Example of HashSet class in java
Example of HashSet class in java. In this part of tutorial, we will introduce you to about the HashSet class.  It is collection. It stores only unique. You can not store duplicate value. Java hashset example. How
Java HashSet  - Java Tutorials
Java Collections Framework- HashSet Class A HashSet is a collection set...;  HashSet(Collection c) HashSet(int capacity) HashSet(int capacity, float... a collection that uses a hash table for storage. Hash table stores information by using
Java hashset example.
Java hashset example.     HashSet is a collection. You can not store duplicate value in HashSet. In this java hashset exmple, you will see how to create HashSet in java application and how to store value in Hashset
Java TreeSet
Java TreeSet       The Collection Framework provides two general-purpose implementations of the set... elements from a collection in a sorted manner.  TreeSet is not synchronized
Collection : HashSet Example
Collection : HashSet Example This tutorial contains description of HashSet with example. HashSet  : HashSet class extends AbstractSet class.... Example : Here is HashSet() example - package collection; import
HASHSET - Java Interview Questions
HASHSET  How To Sort HashSet?I Want Source Code?   Hi... HashSetExample{ public static void main (String args[]){ Set set = new HashSet..."); set.add("Simran"); Set sortedSet= new TreeSet(set); System.out.println(sortedSet
TreeSet
TreeSet We will discus about treeSet() method. The treeSet implement the Set interface. we have stored collection of data and data order of element. We...(), comparator(),Object toElement), tailSet(Object fromElement). TreeSet method
Example of Hashset size() method in java.
Example of Hashset size() method in java. The size() is a method of HashSet class. It is used to calculte the size of HashSet. The size of method is equal to total number of elements in HashSet Code: 
Example of contains method of hashset in java.
Example of contains method of hashset in java. The contains() is a method of hashset. It is used for checking that the given number is available in hashset or not. It returns only boolean value.If number is present in hashset
Example of toArray() method of hashset in java.
Example of toArray() method of hashset in java. The toArray() is a method of HashSet in java. It is used to create array of object. It is also used to copy all element of hashset into array of object. Code: 
Example of Hashset iterator method in java.
Example of Hashset iterator method in java. In this exmple of HashSet class... element from HashSet. Code:  HashSetRemoveElement.java package... RemoveAllElement { public static void main(String[] arg) { HashSet obHashSet = new
java collection
java collection  how do I use a treeset to print unique words
HashSet In Java
HashSet In Java In this section we will read about HashSet in Java. HashSet...(Collection c); HashSet hs2 = new HashSet(int intialCapacity); HashSet hs3 = new...(); HashSet hs1 = new HashSet(Arrays.asList(?Java?,?C++?)); // HashSet from Array
HashSet Example
the methods to add, remove and iterate the values of collection. A HashSet... are performing various operations on HashSet collection. We have explained the steps to add...; To insert an element in the HashSet collection add() method is used. The size
Collection in java
Collection in java  What are the meaning of the letters E,T,K and V that come in the collection concept
Java collection LinkedHashSet
Java collection LinkedHashSet  How can we use LinkedHashSet in java collection?   import java.util.Iterator; import...("HashSet"); ht.add('R'); ht.add("List"); ht.remove
Java Collection API - Java Tutorials
Java Collection API Collection was added to Java with J2SE 1.2 release. Collection framework is provided in 'java.util.package'. All collections... of the collection interfaces. Also, they are reusable data structures. Algorithms
Java collection
Java collection  What is relation between map and set
Collection classes in java
is the reason using java collection classes saved/stored the data/content.I don't understand, what is the idea using java collection classes in project. Or the data is stored in both database and java collection classes
Collection classes in java
is the reason using java collection classes saved/stored the data/content.I don't understand, what is the idea using java collection classes in project. Or the data is stored in both database and java collection classes
Filter collection in Java 8
Filter collection in Java 8  Hi, I have following collection..., Example of Filter collection in Java 8 You can use the following code in Java 8... the data not containing "Java". Thanks   Hi, We have huge collection
collection
collection  As we know array holds the similar kind of elements, then in collection how toArray() method will convert the collection having different objects as elements to an array in java
garbage collection implementation dependent java
garbage collection implementation dependent java  How a garbage collection works in Java
Java collection -Hashtable
Java collection -Hashtable   What is Hashtable in java collection?   Java collection -Hashtable;- The hashtable is used to store value in the form of map key with value. import java.util.Hashtable; import
Java collection-LinkedList
Java collection-LinkedList  How to use java collection-linked list ?   Example: import java.util.Iterator; import java.util.LinkedList; import java.util.List; public class LinkedListExample{ public static void

Ads