i need help

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my code is veryfied but when i execute showing as java.lang.NullPointerException: Solution.java, method main, line: 20 An attempt was made to access an uninitialized object (Null).

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satya vath

Level 9 , Mumbai, India

26 November 2018, 13:07

//Bro use this
package com.codegym.task.task07.task0727;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.ArrayList;
public class Solution {
    public static void main(String[] args) throws IOException {
        BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));

        ArrayList<String> list = new ArrayList<String>();
        while (true) {
            String s = reader.readLine();
            if (s.isEmpty()) break;
            list.add(s);
        }

        ArrayList<String> listEvenOdd = new ArrayList<String>();
        for (int i = 0; i < list.size(); i++) {
            String a = list.get(i);
            if(list.get(i).length()%2==0){
                System.out.println((a+" "+a));
            }
            else{
               System.out.println((a+" "+a+" "+a));
            }
        }

        for (int i = 0; i < listEvenOdd.size(); i++) {
            System.out.println(listEvenOdd.get(i));
        }
    }
}

Brice Silidje

Level 9 , Douala, Cameroon

2 April 2019, 18:55

thanks

Tayyab Mubeen

Level 16 , Lahore, Pakistan

13 November 2018, 18:08

show your code...!!!!

Rad

Level 8 , Maidstone, United Kingdom

13 November 2018, 18:21

package com.codegym.task.task07.task0727; import java.io.BufferedReader; import java.io.IOException; import java.io.InputStreamReader; import java.util.ArrayList; /* Changing functionality */ public class Solution { public static void main(String[] args) throws IOException { BufferedReader reader = new BufferedReader(new InputStreamReader(System.in)); ArrayList<String> list = new ArrayList<String>(); while (true) { String s = reader.readLine(); if (s.isEmpty()) break; list.add(s); } // ArrayList<String> listUpperCase = new ArrayList<String>(); // for (int i = 0; i < list.size(); i++) { // String s = list.get(i); // listUpperCase.add(s.toUpperCase()); // } ArrayList<String> listeven = new ArrayList<String>(); for(int i = 0; i < list.size(); i++) { String s = list.get(i); if((list.get(i).length()) % 2 == 0) { listeven.add(list.get(i) + " " + list.get(i)); } else { listeven.add(list.get(i) + " " + list.get(i) + " " + list.get(i)); } } for(int i = 0; i <listeven.size(); i++){ System.out.println(listeven.get(i));// for (int i = 0; i < listUpperCase.size(); i++) { // System.out.println(listUpperCase.get(i)); } } }