At loss with what else to do

Question about the task

Functionality is not enough!

Java Syntax, Level 10, Lesson 11

Under discussion

Don’t know what to do again

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.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> map = new HashMap<>(); while (true) { try{ int id = Integer.parseInt(reader.readLine()); String name = reader.readLine(); if(name.isEmpty()){ //map.put(null,id); break; } if(map.containsKey(name)) map.put("", id); else map.put(name, id); } catch (NumberFormatException e){ break; } } for(Map.Entry<String, Integer> pair : map.entrySet()) System.out.println(pair.getValue() + " " + pair.getKey()); } }

Comments (2)

Popular
New
Old

You must be signed in to leave a comment

Syed Tayyab ul Mazhar

Level 12 , Karachi, China

18 June 2019, 16:10

1. You need to check whether their is more input before taking input for integer. 2. The entered data must not be lost! Your interpreting of this condition is incorrect. You cannot enter your own default key, you have to use the key from keyboard.

Jesús de Llera

Level 23 , Badajoz, Spain

13 June 2019, 07:48

String input1 = reader.readLine();

 if (input1.isEmpty()) break;

 int number = Integer.parseInt(input1);

 String name = reader.readLine();

 if (name.isEmpty()) {
     pairs.put(name, number);
     break;
 }

 pairs.put(name, number);