Question

Write a method that given a non-empty ArrayList of Integers parameterand also an Integer parameter, the method returns a new ArrayList containing the elements from the original ArrayList that come after the first occurrence of Integer parameter in the original ArrayList.

If the original ArrayList does not contain an occurrence of the Integer parameter return an empty ArrayList . The original ArrayList must be unaffected by the method execution.

Following are some examples of the invocation of the method using explicit parameters, with an ArrayList represented by a bracketed list. The returned ArrayList follows the '→' character.

postList({1, 2, 4, 1}, 4);  →  {1}
postList({3, 1, 4}, 3);     →  {1, 4}
postList({1, 4, 4}, 4);     →  {4}
postList({1, 2, 4, 1}, 5);  →  {}

Answer 1

import java.util.ArrayList;
import java.util.List;

public class ArrayListEx {
   public static void main(String[] args) {
       ArrayList<Integer> list = new ArrayList<>();
       list.add(3);
       list.add(1);
       list.add(4);
       list.add(5);

       System.out.println(postList(list, 3));
   }

   private static List postList(ArrayList<Integer> l, int n) {
       ArrayList<Integer> list = new ArrayList<>();
       boolean flag = false;
       for (int x : l) {
           if (x == n) {
               flag = true;
               continue;
           }
           if (flag)
               list.add(x);

       }
       return list;
   }
}

LITTITULLU TUyLISLL [1, 4, 5]

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