AndroidSketchpad

Welcome to this post.

Today I going to cover a very unusual topic. If this problem is matched with you then it will help you to save a lot of time.

So let's start-

Imagine you have a text file of some data and you want to format it and save the data into the JSON file.

Example text file line:
....
And you have so many lines in the text file.

and your goal is separate, the word and type(part of speech) and description of the word.
so the file output is like

and save this on  a JSON file

This is our today goal. (If you don't clear the take a look again)

Let's jump in the code-
Create the main method and add try catch block


you have to write all the code in the try-catch block.
Create an input and output file name and path variable
make sure you select right path. Now make input and output file.

you can check is your input file exists or not
Output:
Note: If your output is false then your path is wrong, select the right path. until you get this output.

Create an instance of Gson
Note: If you don't know how to add the external library, see this tutorial

Now create a Model class-
Create an array list of this model

Take a look at our data source. This decorated in lines. So we can go through emery lines.
So we run a for loop for every line. Take the buffer reader from the input file and read lines.

I use the buffer size 4096 you can use 1024, or any as you want. If you don't have clear knowledge about buffer size then this answer on StackOverflow

create an instance of StringBuilder.

Step 1: separate the word.
so we read character wise and if we find this sign '-' then stop reading.
so we find our word and that in the StringBuilder
Note: use trim() to remove the space.

Step2: separate the type
first remove the word from the string and do the same code as the word. But this time sign is changed. Now sign is '.'
so we find the type

Step 3: separate the description
first, remove the types
so we find the description.

Extra:
we want to capitalize the first char of the word

Now create the model and add to the list.

So our all word and tyes and des added in the array.

Now our final task is to convert this list to JSON. For this task we use Gson.

Create a new output file on the disk.

Now create the instance of file writer and write this json code in the file.
Don't forget to close the writer.

and finally, print a done message.

So everything is done. Now run the program

Output:

So our JSON file:


Check the full code on GitHub.

Some other problem:

Problem 1:
This time our output design will same but our input design will be different.
The input pattern is

See the solution on Github 

Problem 2:
Input pattern:

Check the solution on Github

That's it today. Today I cover some unusual topics, but this will help you to save time if you have the same problem.

Thank you very much for reading.

Happy coding.

welcome to kotlin series.

Kotlin Series

In this series, we are basically going through some basic and advanced tutorial about kotlin language.
we try to serve you best practices on those tutorials.

Here is the collection of all post

1. String -  kotlin string tutorial
2. Array and loop - array and loop tutorial
3. File reader and write - kotlin IO tutorial. 
4. ArrayList - kotlin ArrayList
5. How to control loop in kotlin - kotlin loop control
6. Collection - kotlin collection such as hash map, array, list
7.Null Safety - kotlin null safety

Series tutorial:
Kotlin OOP series:

1. OOP Basic
2. Constructor
3. Inheritance
4. Method Overriding

Advance:
1.Bookstore a simple program with function and input-output from the console with conditions. 

Welcome to kotlin Series



In this post, we are going to learn about kotlin IO (input or output)

we basically learn about file reader and writer.
In this post, we are going to write a program that takes text from the console and save it on computer hard disk as a text file.
Let start-

First, we are going to create a method for saving file, method name writeToFile
Follow those step:
1. take a String parameter
 2. Create an instance of FileWriter
3. in try-catch block write this string by using write method.
See the code-

fun writeToFile(str: String) {

    val writer = FileWriter("text.txt", true)

    try {
        writer.write(str+"\n")

    } catch (ex: Exception) {
        println(ex.message)

    } finally {
        writer.close()
    }
}

Now time to create the Main method-
in the main method-
1. first we show a message to user to write some text
2. take those text and save in on a variable
3. after the call the writeToFile method and parameter is this variable.
see the code-

fun main(args: Array<String>) {
    println("Write a message")
    val str: String = readLine().toString()

    writeToFile(str)

}

Now time to read this text file and print the text in the console-
Follow those step-
1.create a method name readFile()
2. in try-catch block create an instance of FileReader class
3. print text to the console by using readText() method
see the code-

fun readFile(){

    try {
        val read = FileReader("text.txt")

        println(read.readText())


    } catch (e:Exception){
        println(e.message)
    }

}

In the main method, call this method-

fun main(args: Array<String>) {
    println("Write a message")
    val str: String = readLine().toString()

    writeToFile(str)

    readFile()

}

Now run this program-
after running the programming this will show you like below picture
input some text I input: Hello I am shudipto trafder


Note: Green colored text is your input text and white color text is output text( that read from the file)
this is the text file that saved


Thanks for reading this post.
Happy coding.