I can't verify the last task

Question about the task

Under discussion

after cracking my head open I finally managed a way out of the while loop, yet I'm still unable to "not lose the last number" and I don't understand why... please help

Task: The program reads a pair (a number and string) from the keyboard and displays it on the screen.
New task: The program reads pairs (a number and string) from the keyboard and stores them in a HashMap.
Any empty input signifies the end of data entry.
The numbers can be repeated.
The strings are always unique.
The entered data must not be lost!
The program then displays the contents of the HashMap on the screen.
Each pair on a new line.

Example input:
1 Sam 2 I 1 Am

Example output:
1 Sam 2 I 1 Am

Requirements:

The program must read data from the keyboard.
The program should display text on the screen.
In the main method, declare a HashMap variable and immediately initialize it.
The program should put the pairs read from the keyboard into the HashMap.
The program should display the contents of the HashMap in accordance with the conditions. The key and value are separated by a space. Each value should be on a new line.

package com.codegym.task.task10.task1019; import java.io.*; import java.util.HashMap; import java.util.LinkedHashMap; import java.util.Map; /* Functionality is not enough! */ public class Solution { public static void main(String[] args) throws IOException { BufferedReader reader = new BufferedReader(new InputStreamReader(System.in)); HashMap<String, Integer> newMap = new HashMap<>(); do { //this is stupid int id = Integer.parseInt(reader.readLine()); String name = reader.readLine(); newMap.put(name, id); //much like this. // But I can't seem to get it working without the break. } while (!newMap.containsKey("")); for (Map.Entry<String, Integer> pair : newMap.entrySet()) { //I love these for each loops haha System.out.println( " ID= " + pair.getValue() + "Name= " + pair.getKey()); } } }

Comments (2)

Popular
New
Old

You must be signed in to leave a comment

sourav bamotra

Level 20 , jammu, India

19 November 2020, 09:08

ok so you are using the String value as empty input to break the loop and stop reading data from keyboard. --> but that empty String will get added into the hashMap as one of the key, which is not the task requirement. infact you have to make (String,Integer) pair and put it into the map and if the last input is encountered as empty there is no need of putting those values into the map and break the loop. -->So now as per task condition we are supposed to read int value first and then String value. But if the Integer value is kept empty it will throw NumberFormatException. So we will read String instead and then parse it to Integer and after that we will read other String for key value of HashMap. SOLUTION :

while (true) {
            String number = reader.readLine();
            if (number.isEmpty()) break;

            int id = Integer.parseInt(number);
            String name = reader.readLine();
            map.put(name, id);
        }

Cam

Level 15 , Bogota, Colombia

19 November 2020, 16:50

I get what you are saying but I am trying to complete the loop without using a break