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                                                          Learning to Code

                                                                ArrayList.

                                                                Question -

Implementing all methods of ArrayList 

Create an ArrayList Num with size 12. add  6 numbers 12,14,65,56,80,100

adjust the size automatically.  Show the each item of arraylist iterating.

 Remove 100 and find last index of 14.

Check whether 99 belong to ArrayList or not. How to find arraylist is not empty.

Set element 12 to 873 ..use clone method and clear 

check if element at 4 index is 98 or not Convert Num to array.

                                              Solution-

import java.util.*;

public class DsArrayList {

public static void main (String Args[]){

ArrayList al= new ArrayList();

ArrayList<Integer> Num = new ArrayList<>(12);

//add method

Num.add(12);

Num.add(14);

Num.add(65);

Num.add(56);

Num.add(80);

Num.add(100);

// Trim method

Num.trimToSize();

// Iterator() method

       Iterator <Integer>ir= Num.iterator();

while(ir.hasNext()) {

System.out.println(ir.next()+" ");

}

// Remove Method()

Num.remove(5);

// Index method

Num.indexOf(100);

Num.lastIndexOf(14);

// Contain and empty method

Num.isEmpty();

Num.contains(99);

//Set Method

Num.set(0, 873);

// Clone method

al=(ArrayList)Num.clone();

// clear method

al.clear();

//get method

   if(Num.get(4)==98) {

   System.out.println("Yeah");

   }

   

   // to array and size method

Integer IntegerArray[]= new Integer[Num.size()] ;

  IntegerArray=Num.toArray(IntegerArray);

}}