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package DataStructure;

import javax.swing.*;

import java.util.*;

public class DataStructureDemo {

public static void main(String[] args) {

setInterface();

}

// Collection

// List(I) : Implemented by ArrayList(C), LinkedList(C)

// Set(I) : Implemented by Hashset(C), LinkedHashSet(C)

// Queue(I) : Implemented by PriorityQueue(C), LinkedList(C)

public static void setInterface(){

// Duplicate(X), Insertion Order(x), Hashcode concept used when inserting data, Heterogeneous (0)

HashSet hashSet = new HashSet();

hashSet.add(100);

hashSet.add("Welcome");

hashSet.add(16.4);

System.out.println(hashSet);

System.out.println(hashSet.contains("Welcome"));

System.out.println(hashSet.isEmpty());

for (Object e:hashSet){

System.out.println(e);

}

Iterator it = hashSet.iterator();

while (it.hasNext()){

System.out.println(it.next());

}

HashSet<Integer> evenNumber = new HashSet<Integer>();

evenNumber.add(2);

evenNumber.add(4);

evenNumber.add(6);

System.out.println("Hashset: "+evenNumber);

HashSet<Integer> numbers = new HashSet<Integer>();

numbers.addAll(evenNumber);

// Operation available: Union, Intersection, difference

HashSet<Integer> set1 = new HashSet<Integer>();

HashSet<Integer> set2 = new HashSet<Integer>();

set1.add(1);

set1.add(2);

set1.add(3);

set1.add(4);

set2.add(2);

set2.add(3);

set2.add(4);

// Union

set1.addAll(set2);

// Intersection

set1.retainAll(set2);

System.out.println("Intersections: "+set1);

// Difference

set1.removeAll(set2);

System.out.println("Difference: "+set1);

// Subset (all elements of set2 are contained in set1)

System.out.println(set1.containsAll(set2));

}

public static void queueInterface(){

// FIFO

// Method

// add(): Return true or Exception & offer(): Return true or null value

// element(): Return head element if head is empty, return Exception & peak(): Return null value

// remove() & poll()

// child interface of queue interface

// Deque(I)

// BlockingQueue(I)

// Implementation 2 Classes

// PriorityQueue(C) - Insertion Order(O), Duplicate(O), Heterogeneous (X)

// LinkedList(C) - Insertion Order(O), Duplicate(O), Heterogeneous (O)

LinkedList linkedList = new LinkedList();

linkedList.add("A");

linkedList.add("B");

linkedList.add("C");

linkedList.add(100);

System.out.println("Linkedlist is: "+linkedList);

PriorityQueue priorityQueue = new PriorityQueue();

priorityQueue.add("A");

priorityQueue.add("B");

priorityQueue.add("C");

priorityQueue.add("C");

// priorityQueue.add(100);

System.out.println(priorityQueue); // [A, B, C, C]

System.out.println(priorityQueue.element()); // A

System.out.println(priorityQueue.peek()); // A

System.out.println(priorityQueue.poll()); // remove head

System.out.println(priorityQueue); // [B, C, C]

Iterator itr = priorityQueue.iterator();

while (itr.hasNext()){

System.out.println(itr.next());

}

for (Object obj:priorityQueue){

System.out.println(obj);

}

}

public static void hashMap(){

// Underlying DS is Hashtable

// Insertion order(X)

// n ull key allowed once, multiple null value is allowed

// HashMap m = new HashMap();

HashMap <Integer, String> m= new HashMap<Integer,String>();

m.put(101, "John");

m.put(102, "David");

m.put(103, "Mary");

m.put(104, "Miso");

System.out.println(m.get(103));

System.out.println(m.containsKey(103));

System.out.println(m.isEmpty());

System.out.println(m.keySet());

System.out.println(m.values());

System.out.println(m.entrySet());

for(Object i:m.keySet()){

System.out.println(i+" "+m.get(i));

}

for(Object i:m.values()){

System.out.println(i);

}

for(Map.Entry entry:m.entrySet()){

System.out.println(entry.getKey()+" "+entry.getValue());

}

Set s =m.entrySet();

Iterator itr = s.iterator();

while (itr.hasNext()){

Map.Entry entry= (Map.Entry) itr.next();

System.out.println(entry.getKey()+" "+entry.getValue());

}

}

public void hashTable(){

// Hashtable(Non synchronized)& Hashmap = Map Interface Implementation class, both have same data structure "Hashtable"

// Default capacity is 11, load factor 0.75

// Hashtable t = new Hashtable(initial capacity, fill ration/load factor);

Hashtable<Integer, String> t = new Hashtable<Integer, String>();

t.put(101, "Miso");

t.put(102, "Biso");

t.put(103, "Ciso");

t.put(104, "Diso");

// No Null key value is allowed

System.out.println(t);

System.out.println(t.get(103)); // Ciso

t.remove(101);

System.out.println(t.containsKey(101));

System.out.println(t.containsValue("Ciso"));

System.out.println(t.isEmpty());

System.out.println(t.keySet()); // [102,103,104] returned as set object

System.out.println(t.values()); // [Diso, Ciso, Biso] returned as collection object

for (int k:t.keySet()){

System.out.println(k+" "+t.get(k));

}

for (Map.Entry entry:t.entrySet()) // entry = key + value set

{

System.out.println(entry.getKey()+" "+entry.getValue());

}

// To use Iterator

Set s = t.entrySet();

Iterator itr = s.iterator();

while (itr.hasNext()){

Map.Entry entry= (Map.Entry) itr.next();

System.out.println(entry.getKey()+" "+entry.getValue());

}

}

}