help with this code, output supoose to be $(1,2,2,3,$false$)$ and $(100,$null,null,false$)$

import java.util.Iterator;

import java.util.ArrayList;

import java.util.List;

public class MyIterator implements Iterator $\{$

private List list;

private int index;

public MyIterator$($Iterator iterator$)\{$

this.list $=$ new ArrayList$<>()$;

while$($iterator$.$hasNext$())\{$

this.list.add$($iterator$.$next$())$;

$\}$

this.index $=0$;

$\}$

public Integer lookAhead$()\{$

if$($index $<$ list.size$()-1)\{$

return list.get$($index$+1)$;

$\}$

return null;

$\}$

@Override

public boolean hasNext$()\{$

return index $<$ list.size$()$;

$\}$

@Override

public Integer next$()\{$

if$(!$hasNext$())\{$

return null;

$\}$

Integer element $=$ list.get$($index$)$;

index$++$;

return element;

$\}$

$\}$

import java.util.ArrayList;

import java.util.Arrays;

import java.util.List;

public class HW$7\_1\{$

public static void main$($String$[]$ args$)\{$

List ints $=$ new ArrayList$<>($Arrays$.$asList$(1,2,3))$;

MyIterator iter $=$ new MyIterator$($ints$.$iterator$())$;

System.out.println$($iter$.$next$())$; $//1$

System.out.println$($iter$.$lookAhead$())$; $//2$

System.out.println$($iter$.$next$())$; $//2$

System.out.println$($iter$.$next$())$; $//3$

System.out.println$($iter$.$hasNext$())$; $//$ false

List$($Arrays$.$asList$(100))$p

MyIterator iter$2=$ new MyIterator$($ints$2.$iterator$())$;

System.out.println$($iter$2.$next$())$; $//100$

System.out.println$($iter$2.$lookAhead$())$; $//$ null

System.out.println$($iter$2.$next$())$; $//$ null

System.out.println$($iter$2.$hasNext$())$; $//$ false

$\}$

$\}$