Hello and Happy Thanksgiving (to those who celebrate it),

I have a small program that needs to read data off of a text file (name, city and age) and store it in an array. The program asks the user for a city name, and it's supposed to loop through the array and print out the names of people from that city. Now, my problem starts when I ask for the town to look for, since there are two-word towns (e.g. San Juan). I was using input.next() but it was only accepting the first word. I changed it to input.nextLine() and now it skips that part; it just exits the program.

import java.io.FileReader;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.FileNotFoundException;
import java.util.Scanner;
 
public class projectCOMP2315
{
  public static void main( String [] args )
  {
    Scanner input = new Scanner (System.in);
       
    // Declaracion de variables
    String   nombreDocTXT = null,
             arregloTotalDatos [] = new String [600],
             stringPueblo = null,
             trimmedElement = null;
    int      totalDatos = 0,
             opcion = 0,
             x = 0,
             nuevoIndice = 0;
    boolean  flag = false;
           
    try
    {
      System.out.print( "¿Cual es el nombre del archivo a leer? " );
      nombreDocTXT = input.next();
    
      FileReader reader = new FileReader( nombreDocTXT );
      BufferedReader in = new BufferedReader( reader );
 
      String leeUnoAUno = in.readLine();
     
      while( leeUnoAUno != null )
      {
        arregloTotalDatos[ totalDatos ] = leeUnoAUno;
        leeUnoAUno = in.readLine(); 
        totalDatos = totalDatos + 1;
      }
      
      System.out.print(" \n");
      for ( x = 1 ; x <= 45 ; x++ )
      {
        System.out.print( "*" );
      }
      System.out.print("  M E N U  ");
      for ( x = 1 ; x <= 45 ; x++ )
      {
        System.out.print( "*" );
      }
      System.out.print(" \n1. Print the names of people from a particular town. ");
      System.out.print(" \n2. Imprimir el nombre de todas …. ");
      System.out.print(" \n3. Imprimir los nombres de todas …. ");
      System.out.print(" \n4. Imprimir la lista completa de ….. ");      
      System.out.print(" \n5. Indicar cuántas personas hay en un …… ");
      System.out.print(" \n");
      for ( x = 1 ; x <= 101 ; x++ )
      {
        System.out.print( "*" );
      }
      System.out.print(" \n9. Salir del programa ");
      System.out.print(" \n");
      for ( x = 1 ; x <= 101 ; x++ )
      {
        System.out.print( "*" );
      }
      System.out.print(" \nSeleccion:  ");
      opcion = input.nextInt();
      
      in.close( );
    }
 
    catch( FileNotFoundException filenotfoundexxption )
   {
      System.out.println( nombreDocTXT + " no existe." );
    }
 
    catch( IOException ioexception )
    {
      ioexception.printStackTrace( );
    }
    
    switch (opcion)
    {
      case 1:
      {
        System.out.println( "\n¿De que pueblo desea buscar informacion? " );
        String pueblo = input.nextLine();
        
        stringPueblo = pueblo.trim();
        
        for ( x = 0 ; x < arregloTotalDatos.length ; x++  )
        {
          trimmedElement = arregloTotalDatos[ x ].trim();
       
          if ( (stringPueblo) .equals (trimmedElement) )
          {
            nuevoIndice = x - 1;
            System.out.println(arregloTotalDatos[ nuevoIndice ]);
            flag = true;
          }
        }
        
        if ( flag == false )
        {
          System.out.println( pueblo + "\nNo hay un record con ese pueblo." );
        }
      }
      case 9:
     {
        break;
      }
    } // termina switch
  } // termina main
} // termina projectCOMP2315

I just read cscgal message about people posting their homework problems in hopes of getting a quick solution. Just wanted you to know that I've tried everything I can think of to get a solution for this, you were my last resort.

I tried using two next() statements but it didn't work for single-word towns since it was expecting the user to write a second word...

I tried that and got " non-static method nextLine() cannot be referenced from a static context". Thanks... :-)

if you didn't got the exception here

nombreDocTXT = input.next();

then you can't get it when calling nextLine(); because it's just another method of Scanner class. However, can you provide your updated code that threw exception??

>Now, my problem starts when I ask for the town to look for, since there are two-word towns (e.g. San Juan).

It's pretty simple. Read in the file as lines.

Take that line, assign it to a String then use the appropriate 'string find' methods to get the part you want.

This was interesting. It was really skipping the readLine(). So try this..

System.out.println( "\n¿De que pueblo desea buscar informacion? " );
        input = new Scanner(System.in);
        String pueblo = input.nextLine();

It will work. I'm still trying to know the reason why it was skipping the instruction.

You will have to use some different logic here

nuevoIndice = x - 1;
            System.out.println(arregloTotalDatos[ nuevoIndice ]);

because you are reducing the current index 0 to -1 and trying to print element on -1st index...

Edited 3 Years Ago by Dani: Fixed formatting

lookof2day, thanks for your input, that did the trick... The reason I have this code here

nuevoIndice = x - 1;
System.out.println(arregloTotalDatos[ nuevoIndice ]);

is because the data in the text file is in the format,
Name
Town
Age
Name
Town
Age
etc....

so I already know that if I find a town with that name (e.g. San Juan), the element above it is a person's name.

Thanks everybody for reading my post and helping out...

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