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Question about the task

Method in a try-catch

Java Syntax, Level 9, Lesson 11

Resolved

Please assist

Write a program that will read numbers from the keyboard.
The code for reading numbers from the keyboard must be in the readData method.
Wrap the code inside readData in a try-catch block.
If the user enters text instead of a number, then the method should catch an exception and then display all previously entered numbers.
Display each number on a new line in the same order it was entered.

Requirements:

The program must read data from the keyboard.
Don't change the main method.
The main method should not throw exceptions.
The readData method must contain a try-catch block.
If the user enters text rather than a number, the program should display all previously entered numbers.

package com.codegym.task.task09.task0921; import java.io.BufferedReader; import java.io.InputStreamReader; import java.util.ArrayList; import java.util.List; /* Method in a try-catch */ public class Solution { public static void main(String[] args) { readData(); } public static void readData() { BufferedReader reader = new BufferedReader(new InputStreamReader(System.in)); ArrayList<Integer> nList = new ArrayList<Integer>(); try{ while (!reader.readLine().isEmpty()) { nList.add(Integer.parseInt(reader.readLine())); } } catch(Exception b){ for (int list: nList){ System.out.println(list); } } } }

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Guadalupe Gagnon

Level 37 , Tampa, United States

6 May 2019, 13:56

The conditions state that the loop should continue until text is entered, but this code has the condition that it will continue until nothing is entered.Try making your while loop continue unconditionally (change what you have inside the condition to just 'true')

Henk

Level 19 , Pretoria, South-Africa

7 May 2019, 10:19

I honestly don't know how I did not see THAT, sorry! Misunderstood the requirement, and never even checked it again, apparently.....DUH! lol, thanks for the help!

Guadalupe Gagnon

Level 37 , Tampa, United States

7 May 2019, 13:41

We all make the same mistake. Just recently I had 43 attempts on a task and asked for help. A person responded with "I see you problem, but you aren't going to like it.... your method needs to be public". 100 lines of code and one keyword was wrong. There have been many tasks that had me banging my head against the keyboard.

+16

Ed Maphis

Level 20 , Painesville, United States

27 May 2019, 18:29

Painful.

David

Level 26 , Bucharest, Romania

2 April 2020, 14:01

Does anyone know why this works

public static void readData() {
        //write your code here
        BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));
        ArrayList<Integer> list = new ArrayList<Integer>();
        int a=0;
        try{

        while (true){
            a = Integer.parseInt(reader.readLine());
            list.add(a);
        }
        }

But this is not working ?

public static void readData() {
        //write your code here
        try{
        BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));
        ArrayList<Integer> list = new ArrayList<Integer>();
        int a=0;
        while (true){
            a = Integer.parseInt(reader.readLine());
            list.add(a);
        }
        }