import java.util.ArrayList;

import java.util.Collections;

/*

* AutoBoxing Feature Comes From Java 1.5

* And this is used to convert Primitive Type into Wrapper

* Type and vice-versa.

*/

import java.util.Iterator;

import java.util.ListIterator;

public class Demo2 {

static void evenOdd(int x){

if(x%2==0){

System.out.println("Even No "+x);

}

else{

System.out.println("Odd No "+x);

}

}

public static void main(String[] args) {

// 1.5 Styling

// Generics

ArrayList<Integer> list = new ArrayList<Integer>();

list.add(100);// AutoBoxing

//list.add(new Integer(100)); // Insert at End

list.add(200);

//list.add(new Integer(200));

//list.add("amit");

//list.add(new Double(90.290));

list.add(300);

list.add(0,900); // Insert at specified index

System.out.println(list);

list.remove(1);

System.out.println(list);

// UnBoxing - Object (Wrapper) to Primitive

// Boxing - Primitive to Object(Wrapper)

list.add(list.get(1) + list.get(2)); // AutoBoxing

/*Integer firstNo = (Integer)list.get(1);

Integer secondNo = (Integer)list.get(4);

list.add(new Integer(firstNo.intValue() + secondNo.intValue()));*/

System.out.println("Now List is "+list);

// Search Operation

int index = -1;

index = list.indexOf(200);

if(index>=0){

//if(list.contains(2100)){

System.out.println("Found...");

list.set(index, 10000); // Update

System.out.println("NOw After Updation List is "+list);

//list.remove(index);

}

else

{

System.out.println("Not Found...");

}

Collections.sort(list);

System.out.println("After Sort "+list);

// Traverse

// 1st Way

for(int i = 0 ; i<list.size(); i++){

System.out.println(list.get(i));

}

// 2nd Way

Iterator<Integer> it = list.iterator();

while(it.hasNext()){

int currentElement = it.next();

//it.remove();

// it.next() give current element and then

// move to the next element

System.out.println(currentElement);

}

//3rd Way

ListIterator<Integer> lt = list.listIterator();

while(lt.hasNext()){

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

}

while(lt.hasPrevious()){

System.out.println(lt.previous());

}

//4th Way

for(int d : list){

System.out.println(d);

}

// 5th Way

list.forEach(Demo2::evenOdd);

}

}