What requirement am I missing in the following solution?

Question about the task

Request parser

Java Core, Level 5, Lesson 12

Under discussion

Read a URL from the console.
Display a space-delimited list of all the parameters (The parameters follow the "?" and are separated by "&", e.g. "lvl=15").
The URL contains at least 1 parameter.
The parameters must be displayed in the same order in which they are present in the URL.
If the obj parameter is present, pass its value to the relevant alert method.
alert(double value) - for numbers (fractional numbers have a decimal point)
alert(String value) - for strings
Note that the alert method must be called AFTER the list of all parameters is displayed.

Example 1

Input:
http://codegym.cc/alpha/index.html?lvl=15&view&name=Amigo

Output:
lvl view name

Example 2

Input:
http://codegym.cc/alpha/index.html?obj=3.14&name=Amigo

Output:
obj name double: 3.14

Requirements:

The program should read only one line from the keyboard.
The Solution class must not have static fields.
The program must display data on the screen in accordance with the task conditions.
The program should call the alert method with the double parameter if the obj parameter can be correctly converted to a double.
The program should call the alert method with the String parameter if the obj parameter CANNOT be correctly converted to a double.

package com.codegym.task.task15.task1527; import java.io.BufferedReader; import java.io.IOException; import java.io.InputStreamReader; /* Request parser */ public class Solution { public static void main(String[] args) throws IOException { BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(System.in)); String objKeyValue = null; String URL = bufferedReader.readLine(); String queryString = URL.split("\\?")[1]; String[] queryParams = queryString.split("&"); String result = ""; for (String queryParam : queryParams) { String key = queryParam.split("=")[0], value = queryParam.split("=")[1]; if (key.equals("obj")) { objKeyValue = value; } result += key; result += " "; } System.out.println(result.trim()); if (objKeyValue != null) { try { Double doubleVal = Double.parseDouble(objKeyValue); alert(doubleVal); } catch (NumberFormatException nfe) { alert(objKeyValue); } } } public static void alert(double value) { System.out.println("double: " + value); } public static void alert(String value) { System.out.println("String: " + value); } }

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Mike McKenna

Level 25 , Wilmington, United States

13 March 2021, 22:06

Hi, I had problem getting requirement #3 to work also. following is code that worked for me. I imported java.util.ArrayList; java.util.List also.

public static void main(String[] args) throws IOException {
         BufferedReader rd = new BufferedReader(new InputStreamReader(System.in));

        String URL = rd.readLine();
        String[] arrOfStr = URL.split("[?&]");

        List<String> paramList = new ArrayList<>();

        for (String line : arrOfStr) {
            if (line.contains("="))
                paramList.add(line.substring(0, line.indexOf('=')));
            if (!line.contains("http://") && !line.contains("="))
                paramList.add(line);
        }
 for (String param : paramList)
            System.out.print(param + " ");
        System.out.println();

        for (String line : arrOfStr) {
            if (line.contains("=")) {
                try {
                    double d = Double.parseDouble(line.substring(line.indexOf('=') + 1));
                    if (d % 1.0 == 0 &&!line.contains("obj"))
                        break;
                    alert(d);
                    break;
                } catch (NumberFormatException e) {
                    String str = line.substring(line.indexOf('=') + 1);
                    alert(str);
                    break;
                }
            }
        }


    }

    public static void alert(double value) {
        System.out.println("double: " + value);
    }

    public static void alert(String value) {
        System.out.println("String: " + value);
    }
}

Hope this helps U