Question

Consider the follow ArrayLis in Javat:

ArrayList centennials = new ArrayList<>();

centennials.add(LocalDate.of(1776, Month.JULY, 4));

centennials.add(LocalDate.of(1876, Month.JULY, 4));

centennials.add(LocalDate.of(1900, Month.JULY, 4));

centennials.add(LocalDate.of(1976, Month.JULY, 4));

centennials.add(LocalDate.of(2076, Month.JULY, 4));

As you can observe, a java program author has mistakenly entered a 1900 item into the ArrayList. Without removing the associated centennials.add(...) source line, write the code to remove the errant entry. Print out the resulting ArrayList and size as follows:

Before removal:

07/04/1776

07/04/1876

07/04/1900

07/04/1976

07/04/2076

size = 5

After removal:

07/04/1776

07/04/1876

07/04/1976

07/04/2076

size = 4

Hint: you should use the DateTimeFormatter class for formatting

Answer 1

Code:

import java.io.*;
import java.time.LocalDate;
import java.time.Month;
import java.util.*;
public class arraylist {
public static void main(String[] args)
{
ArrayList centennials=new ArrayList<>();

//Adding data to Array list
centennials.add(LocalDate.of(1776, Month.JULY, 4));
centennials.add(LocalDate.of(1876, Month.JULY, 4));
centennials.add(LocalDate.of(1900, Month.JULY, 4));
centennials.add(LocalDate.of(1976, Month.JULY, 4));
centennials.add(LocalDate.of(2076, Month.JULY, 4));

System.out.println("Before removel:\n");
System.out.println(centennials); //To print the dates before removal of 1990
System.out.println("Size="+centennials.size()); //Find the size of the array list before removel of 1990
centennials.remove(2); //Remove the element at index '2'
System.out.println("After removal:\n");
System.out.println(centennials); //To print the dates after removal of 1990
System.out.println("Size="+centennials.size()); //Find the size of the array list after removal of 1990
}

}

Output:

<terminated> arraylist [Java Application] C:\Program Files Vava\jdk1.8.0_73\bin\javaw.exe (19-Nov-2019, 11:44:07 PM) Before removal: [1776-07-04, 1876-07-04, 1900-97-94, 1976-07-04, 2076-07-04] Size=5 After removal: [1776-07-04, 1876-07-04, 1976-07-04, 2076-07-04] Size=4