Hi, So I\'m stuck in this Practice IT problem. I don\'t know where to start or h

Question

Hi,

So I'm stuck in this Practice IT problem. I don't know where to start or how to write it. Please help!!

Write a static method named collapseSpaces that accepts a Scanner representing a file as a parameter and writes that file's text to the console, with multiple spaces or tabs reduced to single spaces between words that appear on the same line. For example, if aScanner variable named input is reading an input file containing the following text:

then the call collapseSpaces(input); should produce the following output:

Each word is to appear on the same line in output as it appears in the file. Notice that lines can be blank.

Explanation / Answer

/**
* Java program that opens a text file sample.txt
* that contains lines of leading white spaces and tabs
* Then removes the extra white spaces with single
* space and print on console
*
* */
//RemoveSpaces.java
import java.io.File;
import java.io.FileNotFoundException;
import java.util.Scanner;
public class RemoveSpaces
{
   public static void main(String[] args)
   {      
       //declare File and Scanner class variables
       File file=null;
       Scanner input=null;
      
       try
       {
           //open a file using File object
           file=new File("sample.txt");
           //create an instance of Scanner class
           input=new Scanner(file);
          
          
           //calling the static method collapseSpaces that removes the extra white
           //spaces
           collapseSpaces(input);
          
          
           //close the input object of Scanner class
           input.close();
          
       }
       catch (FileNotFoundException e)
       {
           System.out.println("File not found");
       }
      
      
   }

   //The method collapseSpaces that accepts the Scaner object
   //as input argument that reads the text lines from the file
   //and removes all white spaces and prints the lines on console
   //without extra white spaces
   private static void collapseSpaces(Scanner input)
   {
       //Read lines from the input scanner object
       while(input.hasNextLine())
       {
           String line=input.nextLine();
           //call trim method that removes the non-printing characters from line
           //and leading whitespaces
           line=line.trim();
           //Replace all extra white spaces with single space
           //using replaceAlll method
           line=line.replaceAll("\s+"," ").trim();
           System.out.println(line);              
       }
      
      
   }
}
---------------------------------------------------------------------------

sample text file "sample.tx"

four      score   and

seven               years ago         our
          
fathers brought             forth
    on this          continent
a         new
          
nation

---------------------------------------------------------------------------
Sample output:

four score and

seven years ago our

fathers brought forth
on this continent
a new

nation

Hope this helps you

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