Hi, I need help with arrays. Here's what I have so far....

// The "Prefixes123" class.
import java.awt.*;
import hsa.Console;

public class Prefixes123
{
    static Console c;
    
    public static void main (String[] args)
    {
        c = new Console ();

        String prefix;
        String word;
        String sentences;

        c.print ("Enter the prefix: ");
        prefix = c.readLine ();
        c.print ("Enter the word: ");
        word = c.readLine ();
        c.print ("Enter the sentence: ");
        sentences = c.readLine ();

        String [] arraystr = sentences.split (" ");

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

            if (arraystr.equals (word))
                c.print (prefix + arraystr [i]);

    } // main method
} // Prefixes123 class

What I need to be doing is adding a prefix into a word inside a string on its every occurrence. My problem is I don't know how to call the arrays before the word and after. NOTE: I'm not allowed to use any of the String methods (like .replace()) except for charAt() and .length.

Edited 5 Years Ago by Daigan: n/a

since you are already using 'split', I would guess you're ... heading for a fall, as the song says.

I'm not sure what you mean by 'calling the arrays before the word and after', but I'll tell you what to do if you mean what I think you mean:

1. place your original sentence in a separate array
2. place the word you are looking for in a separate String
3. loop over your array
if ( current element equals the word you look for)
change value to "prefix " + " currentValue"

@stultuske Actually, that IS what the OP is trying to do.

Line #28 should be using your index.

if (arraystr[i].equals (word))  // IF you need to...
   c.print (prefix);     // ...print your prefix.
c.print (arraystr[i]); // Print the "words" of your string.

However, you will have to add spacing accordingly.

Edited 5 Years Ago by hfx642: n/a

since you are already using 'split', I would guess you're ... heading for a fall, as the song says.

I'm not sure what you mean by 'calling the arrays before the word and after', but I'll tell you what to do if you mean what I think you mean:

1. place your original sentence in a separate array
2. place the word you are looking for in a separate String
3. loop over your array
if ( current element equals the word you look for)
change value to "prefix " + " currentValue"

Could you provide an example, please?

@hfx642

What I need to do is to print the words in the array before the word and after the word with the added prefix. So let's say I entered "I want to upload". The chosen word and prefix are upload and re. The result would be I want to reupload. Sorry if I didn't elaborate from my previous post.

Understood... and the snippet of code I gave you will achive the desired result.
However, you will also have to accommodate for the desired spacing between the words.
You could do this by adding a space at the end of printing your word.

c.print (arraystr[i] + " ");

Edited 5 Years Ago by hfx642: n/a

There's an error when I tested out the code you gave me.

c.print (arraystr[i] + " ");

. An ArrayIndexOutOfBoundsException error? And from what I understand of the code you gave me. Shouldn't it just print the prefix + the word from the array? So wouldn't it be the same as

c.print (prefix + arraystr[i] + " ");

?

Edited 5 Years Ago by Daigan: n/a

1. You forgot to put your "{}" around the code for your "for loop".
2. No. Your way will print ONLY the prefix and word.
My way will print every word in the sentence, including the prefix.

Thank you so much. But could explain to me why it adds the prefix to just the word and not at the beginning of the sentence. Because from what I understand this code:

if (arraystr [i].equals (word))
                c.print (prefix);
            c.print (arraystr [i] + " ");

Should print the prefix first then the rest of the array.

Maybe seeing it this way will demonstrate better...

for (int i = 0 ; i < arraystr.length ; i++)
{
   if (arraystr [i].equals (word)) c.print (prefix);  // this will display the prefix ONLY if it finds the search word
   c.print (arraystr [i] + " ");  // this will display EVERY word
}

The way that you had it...

for (int i = 0 ; i < arraystr.length ; i++)
   if (arraystr.equals (word)) c.print (prefix + arraystr [i]);

will only display the prefix and the search word.

Edited 5 Years Ago by hfx642: n/a

Sorry I forgot that I need to return the new sentence instead of just using print. And I have no idea how to do it.
Here's what I have so far:

// The "AddingPrefixes" class.
import hsa.*;
import javax.swing.JOptionPane;

public class AddingPrefixes
{
    static Console c;           // The output console
    static char proc;
    static String prefix;
    static String word;
    static String sentences;

    private void title ()
    {
        c.print (' ', 32);                  
        c.println ("Adding a Prefix");        
        c.println ();                           
    }


    public void intro ()
    {
        c = new Console ();
        title ();

        c.println ("This program allows you to add a prefix of your choice to a word in a sentence that you input.");
        c.println ();
        c.print ("To continue input 'p'");

        while (true)
        {
            try
            {
                proc = c.readChar ();
                if (proc == 'p')
                    c.print ("lol");
                else
                    JOptionPane.showMessageDialog (null, "That's not one of the options. Please Try Again");
            }
            catch (Exception e)
            {
                JOptionPane.showMessageDialog (null, "That's not one of the options. Please Try Again");
            }
        }
    }


    public void mainmenu ()
    {
        c = new Console ();
        title ();

        c.print (' ', 18);
        c.println ("The following are the choices for the program: ");
        c.println ();
        c.print (' ', 18);
        c.println ("To continue : 'p'");
        c.print (' ', 18);
        c.println ("To go through the introduction : 'i'");
        c.print (' ', 18);
        c.println ("To exit the program : 'x'");
        c.println ();
        c.print (' ', 18);
        c.print ("Enter your choice: ");

        while (true)
        {
            try
            {
                proc = c.readChar ();
                if (proc == 'p')
                    askData ();
                if (proc == 'i')
                    intro ();
                if (proc == 'x')
                    goodbye ();
                else
                    JOptionPane.showMessageDialog (null, "That's not one of the options. Please Try Again");
            }
            catch (Exception e)
            {

            }
        }
    }


    public void askData ()
    {
        c = new Console ();
        title ();

        c.print (' ', 18);
        c.print ("Enter the prefix: ");
        while (true)
        {
            try
            {
                prefix = c.readLine ();
                break;
            }
            catch (Exception e)
            {
                JOptionPane.showMessageDialog (null, "That's not one of the options. Please Try Again");
            }
        }


        c.print (' ', 18);
        c.print ("Enter the word: ");
        while (true)
        {
            try
            {
                word = c.readLine ();
                break;
            }
            catch (Exception e)
            {
                JOptionPane.showMessageDialog (null, "That's not one of the options. Please Try Again");
            }
        }


        c.print (' ', 18);
        c.print ("Enter the sentence: ");
        while (true)
        {
            try
            {
                sentences = c.readLine ();
                displayData();
            }
            catch (Exception e)
            {
                JOptionPane.showMessageDialog (null, "That's not one of the options. Please Try Again");
            }
        }
    }


    private String prefix (String newS, int i)
    {

        String[] arraystr = sentences.split (" ");

        for (i = 0 ; i < arraystr.length ; i++)
        {
            if (arraystr [i].equals (word))
            c.print (prefix);
            c.print (prefix + arraystr [i] + " ");
            
        }
        newS = (prefix) + (arraystr [i] + " ");

        return (newS);
    }


    public void displayData ()
    {
        c = new Console ();
        title ();

        c.print ("The sentence(s) you typed in is/are " + sentences + " is/are converted to" + prefix ("null", 0));
    }


    public void goodbye ()
    {
        c = new Console ();
        title ();
        c.print ("This is the end of the program. Thank you for using it!");
    }


    public static void main (String[] args)
    {
        AddingPrefixes d;
        d = new AddingPrefixes ();
        d.mainmenu ();

    } // main method
} // AddingPrefixes class

My problem is at the prefix method. I got mixed up there and got stucked. I don't know how to return the new arrays with the prefix

Edited 5 Years Ago by Daigan: n/a

a) Please mark this thread as "solved".

b) Please don't post the same problem in multiple threads.

This question has already been answered. Start a new discussion instead.