Suppose you are given a text file that contains the names of people. Every name

Question

Suppose you are given a text file that contains the names of people. Every name in the file consists of a first name and last name. Unfortunately, the programmer that created the file of names had a strange sense of humor and did not guarantee that each name was on a single line of the file. Read this file of names and write them to a new text file, one full name (both first name and last name) per line.

For example, if the input file contains

    Bob Jones Fred               

Charles Ed                                              Marston Jeff                                Williams Ken                                    Smith Tom Lorry

The output file should be

    Bob Jones                                               Fred Charles

Ed Marston

Jeff Williams   

Ken Smith                                                 Tom Lorry

This is the code I have so far

import java.io.PrintWriter;
import java.util.Scanner;
import java.io.File;

import java.io.FileNotFoundException;

public class ExtraCredit041{

    public static void main(String[] args){

        String fileName = "out.txt";
  Scanner inputStream = null;
        System.out.println("The file " + fileName +
                           " contains the following lines: ");

       try{

           inputStream = new Scanner(new File(fileName));
       }//Ending bracket of try block

       catch(FileNotFoundException e){
           System.out.println("Error opening the file " +
                               fileName);
           System.exit(0);
       }//Ending bracket of catch block

       while(inputStream.hasNextLine()){
   String line = inputStream.nextLine();
   String[]outlist = line.split(" ");
    for(int i =0; i<outlist.length;i++){

    System.out.println(outlist[i]);

   }//Ending bracket of for loop

       }//Ending bracket of input while loop

       inputStream.close();

       //new code
String fileName = "out.txt"; //The name could be read from
                                     //the keyboard.
        PrintWriter outputStream = null;
        try{
            outputStream = new PrintWriter(fileName1);
        }
        catch(FileNotFoundException e){
            System.out.println("Error opening the file " +
                                fileName1);
            System.exit(0);
        }

            outputStream.println(line);
        }
        outputStream.close( );
        System.out.println("Those lines were written to " +
                            fileName1);
    }//Ending bracket of method main
}//Ending bracket of class ExtraCredit04

Explanation / Answer

import java.io.File;

import java.io.FileNotFoundException;

import java.io.PrintWriter;

import java.util.ArrayList;

import java.util.Scanner;

public class ExtraCredit041 {

public static void main(String[] args) {

String inputfileName = "/Users/Desktop/inputfile.txt";

String outputfileName = "/Users/Desktop/outputfile.txt"; // The name could be read from the keyboard.

Scanner inputStream = null;

PrintWriter outputStream = null;

String firstName = null;

String lastName = null;

ArrayList<String> al = new ArrayList<String>();

System.out.println("The file " + inputfileName + " contains the following lines: ");

StringBuffer sb = new StringBuffer();

String line = null;

String name = firstName = lastName = null;

try {

inputStream = new Scanner(new File(inputfileName));

while (inputStream.hasNextLine()) {

line = inputStream.nextLine();

sb.append(line);

sb.append(" ");

//System.out.println(sb);

}

line = sb.toString();

line = line.replaceAll("\s+", " "); // removing all the double space

System.out.println(line);

String[] outlist = line.split(" ");

if(outlist.length% 2 == 0){

for (int i = 0; i < outlist.length; i++) {

System.out.println(outlist[i].trim());

if(i%2 == 0){

firstName = outlist[i].trim();

}else{

lastName= outlist[i].trim();

if(firstName != null && firstName.length() > 0){

name = firstName + " " + lastName;

al.add(name);

firstName = null;

lastName = null;

}

}

}

}

// now write the output

outputStream = new PrintWriter(outputfileName);

for (String str : al){

outputStream.println(str);

}

System.out.println("Those lines were written to " + outputfileName);

}catch (FileNotFoundException e) {

e.printStackTrace();

}

inputStream.close();

outputStream.close();

}// Ending bracket of method main

}// Ending bracket of class ExtraCredit04

The output file will contain :

Bob Jones

Fred Charles

Ed Marston

Jeff Williams

Ken Smith

Tom Lorry

Bob Jones Fred Charles

Ed Marston

Jeff Williams

Ken Smith Tom Lorry

This is because there should be some way to identify the firstname and lastname.

So the only way possible is to consider first word as firstname, second word as last name for a person...

Similarily 3rd and 4th word will be first and lastname for second person and so on....

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