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23_Set_HashSet.java

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import java.util.HashSet;

import java.util.Set;

import java.util.TreeSet;

public class Main {

public static void main(String[] args) {

// Set demonstration using HashSet

Set<Integer> hashSet = new HashSet<>();

hashSet.add(23);

hashSet.add(4);

hashSet.add(10);

for (int element: hashSet) {

System.out.println(element + " ");

}

// hashSet.isEmpty(); // returns true, if Set is empty

// hashSet.contains(10); // returns true, if the element is found

// hashSet.remove(23); // returns true, if the element was deleted

// hashSet.clear(); // Deletes all element

System.out.println();

Set<Integer> treeSet = new TreeSet<>();

treeSet.add(23);

treeSet.add(4);

treeSet.add(10);

treeSet.add(1);

for (int element: treeSet) {

System.out.println(element + " ");

}

* Set: Interface

* HashSet: Implementation

* TreeSet: Implementation [sorted]

* Properties:

* 1. Unordered Collection

* 2. Cannot store duplicate elements

* 3. It has more implementation such as HashSet, TreeHashSet and TreeSet

* TreeSet contains elements in Sorted Order

* */