Help please

Question about the task

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Not sure what Im doing wrong. I think Im not reading in the list correctly. Ignore the test tab, I created that in IntelliJ to try to test it.

1. Read a file name from the console.
2. Read a set of numbers from the file.
3. Display only the even numbers, sorted in ascending order.

Example input:
5 8 -2 11 3 -5 2 10

Example output:
-2 2 8 10

Requirements:

The program must read data from the console.
The program must create a FileInputStream using the line read from the console.
The program should display data on the screen.
The program should display all of the even numbers read from the file, sorted in ascending order.
The program must close the input stream used to read the file (FileInputStream).

5 8 -2 11 3 -5 2 10

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Abhishek Rangari

Level 22 , Nagpur, India

2 December 2018, 02:33

solution

Here are the problems in your code - #1 - as per condition you need to "create a FileInputStream using the line read from the console." which cant be performed as your code is

BufferedReader fileReader = new BufferedReader(new InputStreamReader(new FileInputStream(reader.readLine())));

#2 - try to read data from created fileInputStream variable and get the value in string variable and try checking on it for null instead of converting read string in Integer variable and checking on it. Please modify line number 25 in your code to something like this

FileInputStream input = new FileInputStream(filename);
           reader = new BufferedReader(new InputStreamReader(input));

           ArrayList<Integer> list = new ArrayList<Integer>();
           String data = null;

           while((data = reader.readLine()) != null){
               list.add(Integer.parseInt(data));
           }

#3 - and lastly you need to close the input stream

input.close();

I hope this code will help you out.

+10

Benjamin Winchester

Level 17 , Savannah, United States

2 December 2018, 07:02

That did it. Thanks!

Hashirama

Level 26 , Port-Harcourt, Nigeria

5 February 2019, 04:01

Thanks.

Deepak Chandra

Level 16 , Visakhapatnam, India

13 July 2019, 03:54

Hey @Abhishek Rangari you dont need to write String data = null on line 5 as it is redundant because default value for a string is null so you dont need to initialize it to null just declare it and leave it like String a; this.

Michael Martin

Level 2 , Arlington, United States

1 December 2018, 19:43

Did you ever get this working?