What is wrong?

Pytania dotyczące zadania

Rozwiązane

I've tried on some different ways as you can see commented lines but none of them working! even the task with delete 3rd element doesn't work. please heeeelp and explain why it doesn't work :(

package pl.codegym.task.task07.task0714; import java.io.BufferedReader; import java.io.InputStreamReader; import java.util.ArrayList; import java.util.Collections; /* Słowa na odwrót */ public class Solution { public static void main(String[] args) throws Exception { BufferedReader reader = new BufferedReader(new InputStreamReader(System.in)); ArrayList<String>list = new ArrayList<>(); ArrayList<String>rlist = new ArrayList<>(); while(true){ String s = reader.readLine(); if(s.isEmpty()) break; list.add(s); } list.remove(3); //for(int i = 0; i<list.size(); i++) //System.out.println(list.get(i)); //for(int i = 3; i>=0; i--) //System.out.println(list.get(i)); for(int i = 0; i<list.size(); i++) rlist.add(0, list.get(i)); for(int i = 0; i<rlist.size(); i++) System.out.println(rlist.get(i)); //tutaj wpisz swój kod } }

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Thomas

Poziom 41 , Bayreuth, Germany

17 lutego, 12:18

rozwiązanie

line 19 may be a problem as an empty string still is a valid string (at least the task does not tell to break when an empty string is entered). Instead you're supposed to ask the user for exactly 5 strings. line 22 does not remove the correct element (the third element has the index 2) For outputting I suggest not to create an additional list. Just loop over the original one and either start from index list.size() - 1 and count to zero or you do the usual loop from zero to < size() and output list.get(list.size() - i - 1)

//either
for (int i = list.size() - 1; i >= 0; i--) {
    System.out.println(list.get(i));
}
// or
for (int i = 0; i < list.size(); i++) {
    System.out.println(list.get(list.size() - i - 1));
}

Dawid

Poziom 8 , Poland

18 lutego, 08:22

Thank you! I did it this way you told me and it passed! funny is that i changed that index to 3 after 2 wasn't working either. but after doing it simpler it works.