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Question about the task

Request parser

Java Core, Level 5, Lesson 12

Under discussion

Just needed to format the output correctly. Not sure if other test case would fail my output order as requested.

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; import java.sql.SQLOutput; import java.util.ArrayList; import java.util.Scanner; /* Request parser */ public class Solution { public static void main(String[] args) { //write your code here Scanner sc = new Scanner(System.in); String URL = sc.nextLine(); ArrayList<String> list = new ArrayList<String>(); ArrayList<Double> value = new ArrayList<Double>(); String[] arr = URL.split("\\?"); String secondSplit = arr[1]; String[] arr2 = secondSplit.split("&"); for(String s : arr2){ String[] arr3 = s.split("="); if(arr3[0].equals("obj")){ try{ double num = Double.parseDouble(arr3[1]); value.add(num); list.add(arr3[0]); } catch (Exception e){} } else list.add(arr3[0]); } for(String s : list) alert(s); System.out.println(); for(double v : value) alert(v); } public static void alert(double value) { System.out.print("double: " + value); } public static void alert(String value) { System.out.print(value + " "); } }

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Thomas

Level 41 , Bayreuth, Germany

13 May 2020, 06:39

You have to call the alert(String) method if the obj value can't be parsed into a double. Means catch the NumberFormatException, and save the value to be later possible to display it. I'd save, if exists, the obj value in a String variable (not in a list, it's just one parameter). After displaying all the parameter names check, if the String variable has a value and then parse for a double. If that works call the alert(double) method. If not, catch the NumberFormatException and call alert(String).