Set, HashSet and TreeSet : Set « Collections Data Structure « Java

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Java » Collections Data Structure » Set

Screenshots

Set, HashSet and TreeSet


    



import java.util.HashSet;

import java.util.Set;

import java.util.TreeSet;



public class Main {



  public static void main(String args[]) {

    Set<String> hs = new HashSet<String>();



    hs.add("one");

    hs.add("two");

    hs.add("three");



    System.out.println("Here is the HashSet: " + hs);



    if (!hs.add("three"))

      System.out.println("Attempt to add duplicate. " + "Set is unchanged: " + hs);



    TreeSet<Integer> ts = new TreeSet<Integer>();



    ts.add(8);

    ts.add(19);

    ts.add(-2);

    ts.add(3);



    System.out.println(ts);



    System.out.println("First element in ts: " + ts.first());

    System.out.println("Last element in ts: " + ts.last());



    System.out.println("First element > 15: " + ts.higher(15));

    System.out.println("First element < 15: " + ts.lower(15));

  }

}

Related examples in the same category

1.	Things you can do with Sets
2.	Set operations: union, intersection, difference, symmetric difference, is subset, is superset
3.	Set implementation that use == instead of equals()
4.	Set that compares object by identity rather than equality
5.	Set union and intersection
6.	Set with values iterated in insertion order.
7.	Putting your own type in a Set
8.	Use set
9.	Another Set demo
10.	Set subtraction
11.	Working with HashSet and TreeSet
12.	TreeSet Demo
13.	Show the union and intersection of two sets
14.	Demonstrate the Set interface
15.	TreeSet Test
16.	Array Set extends AbstractSet
17.	Sync Test
18.	Set Copy
19.	Set and TreeSet
20.	Tail
21.	What you can do with a TreeSet
22.	Remove all elements from a set
23.	Copy all the elements from set2 to set1 (set1 += set2), set1 becomes the union of set1 and set2
24.	Remove all the elements in set1 from set2 (set1 -= set2), set1 becomes the asymmetric difference of set1 and set2
25.	Get the intersection of set1 and set2, set1 becomes the intersection of set1 and set2
26.	Extend AbstractSet to Create Simple Set
27.	Int Set
28.	One Item Set
29.	Small sets whose elements are known to be unique by construction
30.	List Set implements Set
31.	Converts a char array to a Set
32.	Converts a string to a Set
33.	Implements the Set interface, backed by a ConcurrentHashMap instance
34.	An IdentitySet that uses reference-equality instead of object-equality
35.	An implementation of the java.util.Stack based on an ArrayList instead of a Vector, so it is not synchronized to protect against multi-threaded access.
36.	A thin wrapper around a List transforming it into a modifiable Set.
37.	A thread-safe Set that manages canonical objects

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