package abc;

import java.util.*;

import javax.swing.plaf.synth.SynthSeparatorUI;

public class ListTest {

public static void main(String... Args)

{

ArrayList List=new ArrayList();

List.add("test");

List.add(123);

List.add(402.56);

List.add(false);

System.out.println(List);

ArrayList List1=new ArrayList(); //new class of interface List

List1.add(111);

List1.add(222);

List1.add(333);

List.addAll(List1); // adds the list1 to List

System.out.println(List1);

List.remove(5);

System.out.println(List); //prints the list

System.out.println(List.get(2)); // retrieves the data at @nd index

System.out.println(List.contains(13)); //contains checks if the enclosed value is present

List.addAll(2,List); // adds the 'List' after the second index

System.out.println(List);

// traversing the array list METHOD 1

for(Object obj : List)

{

System.out.print(obj+" ");

}

System.out.println("");

//traversing the array list METHOD 2 ITERATOR INTERFACE

Iterator it=List.iterator();//iterator is a method in Iterator so name not same

/*

* -----public boolean hasNext()

* checks whether the first object has next and if true

* it returns true;

* -----public Object Next()

* when hasNext true then retrieves the value and then

* brings it to nec=xt value stored

* -----public void remove()

*

*/

while(it.hasNext())

{

Object obj=it.next();

System.out.print(obj+" ");

}

System.out.println("");

/*Iterator while fetching moves in forward direction only

* so if we want to iterate from both directions

* then we use another Interface ListIterator

*/

ListIterator it1=List.listIterator();

//this is again for transversal

/*

* has five methods

* ----three existing ones

* ----hasPrevious()

*

* ----Previous()

*/

System.out.println("Forwards first");

while(it1.hasNext())

{

Object Obj=it1.next();

System.out.print(Obj +" ");

}

System.out.println("");

System.out.println("backwards now");

while(it1.hasPrevious())

{

Object Obj=it1.previous();

System.out.print(Obj+" ");

}

System.out.println("");

}

}