I get an error when checking the last condition:

Question about the task

Duplicating words

Java Syntax, Level 7, Lesson 9

Under discussion

I get an error when checking the last condition: Display the resulting list, each element on a new line.

1. Read 10 words from the keyboard and add them to a list of strings.

2. The doubleValues method should duplicate words like this:
alpha, beta, gamma, -> alpha, alpha, beta, beta, gamma, gamma.

3. Display the result, each value on a new line.

Requirements:

Declare a string list variable and immediately initialize it.
Read 10 lines from the keyboard and add them to the list.
The doubleValues method should duplicate list elements like this: alpha, beta, gamma, -> alpha, alpha, beta, beta, gamma, gamma.
Display the resulting list, each element on a new line.

package com.codegym.task.task07.task0717; import java.io.BufferedReader; import java.io.InputStreamReader; import java.util.ArrayList; /* Duplicating words */ public class Solution { public static void main(String[] args) throws Exception { BufferedReader reader = new BufferedReader(new InputStreamReader(System.in)); String a; ArrayList<String>list = new ArrayList<String>(); while(true) { a = reader.readLine(); if(a.isEmpty()) break; list.add(a); } //System.out.println(list); ArrayList<String> result = doubleValues(list); for(int i = 0; i < result.size(); i++) { System.out.println(result.get(i)); } } public static ArrayList<String> doubleValues(ArrayList<String> list) { ArrayList<String>result = new ArrayList<String>(); for(int i = 0; i < list.size(); i++) { result.add(list.get(i)); result.add(list.get(i)); } return result; } }