Thread: PigLatin translator help

So here are the assignment instructions:

For this assignment, your job is to create a program that reads in multiple lines of text, and then produces the translation of that text into the English language variant known as "pig latin".

Pig latin works this way: if a word begins with a vowel (a-e-i-o-u), then "ay" is added to the end of the word (so "idle" -> "idleay", and "often" -> "oftenay"); on the other hand, if a word begins with a consonant, then the first letter is removed, and is placed at the end of the word, followed by "ay" (so "month" -> "onthmay", and "castle" -> "astlecay").

Your program, then, should read in multiple lines of text, ending finally with two carriage returns. After the reading segment ends, your program should then print the pig latin translation of the input text. As a simplification, report the translation with no punctuation, and in all lower case.

Below we give you the driver (the PigLatinTester class), and an input class called JInputer, which uses JOptionPane for input. Your job is to write the PigLatin class so that PigLatinTester works appropriately.

public class PigLatinTester{
 
public static void main(String[] args){
JInputer r = new JInputer("pig latin!");
r.multiInputs();
r.reportPhrases();
PigLatin p = new PigLatin(r.getPhrases());
p.pigAll();
p.pigReport();
}
}

import javax.swing.JOptionPane;
 
public class JInputer{
private String cur = "";
private String message; //JOptionPane caption
private String[] phrases = new String[50];
private int pos = 0;
 
public JInputer(String msg){
message = msg;
}
 
public JInputer(){
}
 
public String getInput(){
cur = JOptionPane.showInputDialog(message);
phrases[pos] = cur;
pos++;
return cur;
}
 
public void multiInputs(){
String s = " ";
while (s.length() > 0){
s = getInput();
}
}
 
public String[] getPhrases(){return phrases;}
 
public void reportPhrases(){
for (String s : phrases)
if (s != null) System.out.println(s);
}
 
}

My job is to write the PigLatin class so the driver works and this is what i got so far but it has compilation issues...

import java.lang.*;
 
public class PigLatin{
 
public String[] phrases;
public String result;
public String t;
 
public PigLatin(){}
 
 
public String pigAll(){
result="";
StringTokenizer str;
str = new StringTokenizer(phrases,"\t\n\r\f,.?!;: ");
while(str.hasMoreTokens()){
result += " ";
result += translateTo(str.nextToken());
} return result;
}
 
public String translateTo(String s){
String s2 = "";
for(int j=0; j< phrases.length; j++){
s=phrases[j];
s=s.toLowerCase();
if((s.charAt(0)=='a' || s.charAt(0)=='e' || s.charAt(0)=='i' ||
s.charAt(0)=='o' || s.charAt(0)=='u')){
s2 = (s+"ay");
}
else{
s2 = s.substring(1) + "ay"; 
}
} return s2;
}
 
public void pigReport(){
System.out.println(pigAll());
}
}

and i get these compilation errors:
File: C:\Users\Korobkov\PigLatin.java [line: 16]
Error: C:\Users\Korobkov\PigLatin.java:16: cannot find symbol
symbol : constructor StringTokenizer(java.lang.String[],java.lang.String)
location: class java.util.StringTokenizer
File: C:\Users\Korobkov\PigLatinTester.java [line: 10]
Error: C:\Users\Korobkov\PigLatinTester.java:10: cannot find symbol
symbol : constructor PigLatin(java.lang.String[])
location: class PigLatin

What is the matter with the constructor and why is the
StringTokenizer not being recognized...

Parameters to constructors and methods must match in number, type and order. StringTokenizer has 3 constructors:
String
String, String
String, String, boolean

Are you using any of those constructors? Obviously not since you got a compiler error. Same problem for your second error.

P.S. The StringTokenizer class has been deprecated and you are encouraged to use the String.split method instead.

so i fixed the piglatin constructor but i still dont get the stringtokenizer one.

import java.util.StringTokenizer;
import java.lang.*;
 
public class PigLatin{
 
  public String[] phrases;
  public String result;
  public String t;
 
  public PigLatin(String[] array){
    phrases = array;
  }
 
 
 
  public String pigAll(){
    result="";
    java.util.StringTokenizer str = new java.util.StringTokenizer(phrases,"\t\n\r\f,.?!;: ");
    while(str.hasMoreTokens()){
      result += " ";
      result += translateTo(str.nextToken());
    } return result;
  }
 
  public String translateTo(String s){
    String s2 = "";
    for(int j=0; j< phrases.length; j++){
      s=phrases[j];
      s=s.toLowerCase();
      if((s.charAt(0)=='a' || s.charAt(0)=='e' || s.charAt(0)=='i' ||
          s.charAt(0)=='o' || s.charAt(0)=='u')){
        s2 = (s+"ay");
      }
      else{
        s2 = s.substring(1) + "ay"; 
      }
    } return s2;
  }
 
  public void pigReport(){
    System.out.println(pigAll());
  }
}

1 error found:
File: C:\Users\Korobkov\PigLatin.java [line: 18]
Error: C:\Users\Korobkov\PigLatin.java:18: cannot find symbol
symbol : constructor StringTokenizer(java.lang.String[],java.lang.String)
location: class java.util.StringTokenizer

my teacher is making us use stringtokenizer and from what examples i have seen there were no constructors made
they just imported the java.util.*; and borrowed it from there. so what do i do to make this last error go away since im not supposed to make a separate class just to create stringtokenizer constructor and i dont think it will compile if i make the string tokenizer constructor within the piglatin class.

Oh come on. What is the first parameter you are passing to the StringTokenizer constructor?

I am working on the same program for my Java class. I am stuck at the same point that Rusak is at. Is there a way to convert the String[] into a regular string? Or is there another way to find the solution.

You haven't tried very hard. I posted the three constructors the StringTokenizer class has. You are trying to call the String array, String constructor which does not exist.

I think i got it. It compiles but the dam thing wont work now lol.

import java.util.StringTokenizer;
import java.lang.*;
 
public class PigLatin{
 
  public String[] phrases;
  public String result;
  public String s;
  public String token;
  StringTokenizer str;
 
  public PigLatin(String[] array){
    phrases = array;
  }
 
 
 
  public String pigAll(){
    result="";
    StringTokenizer str;
    for(int j=0; j<phrases.length; j++){
      s=phrases[j];
      str = new StringTokenizer(s,"\t\n\r\f,.?!;: ");
      while(str.hasMoreTokens()){
        result += " ";
        result += translateTo(str.nextToken());
      } 
    }  return result;
  }
 
  public String translateTo(String token){
    token=str.nextToken();
    token=token.toLowerCase();
    if((token.charAt(0)=='a' || token.charAt(0)=='e' || token.charAt(0)=='i' ||
        token.charAt(0)=='o' || token.charAt(0)=='u')){
      token = (token+"ay");
    }
    else{
      token = token.substring(1) + "ay"; 
    }
    return token;
  }
 
  public void pigReport(){
    System.out.println(pigAll());
  }
}

java.lang.NullPointerException
at PigLatin.translateTo(PigLatin.java:32)
at PigLatin.pigAll(PigLatin.java:26)
at PigLatinTester.main(PigLatinTester.java:11)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Nativ e Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknow n Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Un known Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at edu.rice.cs.drjava.model.compiler.JavacCompiler.ru nCommand(JavacCompiler.java:271)
>
So i used a for loop to go through each position in the array which contains a string and then pass that string to stringtokenizer which goes and while there are more tokens uses the translateTo method to translate each token... but it still errors.

On line 32 something is null. Time for you to debug your code. Add a print statement(s) before that line and print out all the variables to find out which is null. Then work out why it is null.

I just had a thought. If your phrases array has a length of 10 and you only add 3 phrases to it then the other 7 slots will be null. However your loop iterates over the entire array and you try and process the nulls as well.

So i added a while statement that makes it continue as long as the string s is not null but now it wont work at all it just does the first part of the driver class where it reports the inputs but doesnt not print out the translation...

import java.util.StringTokenizer;
import java.lang.*;
 
public class PigLatin{
 
  public String[] phrases;
  public String result;
  public String s;
  public String token;
  StringTokenizer str;
 
  public PigLatin(String[] array){
    phrases = array;
  }
 
  public String pigAll(){
    result="";
    StringTokenizer str;
    while(s!=null){
      for(int j=0; j<phrases.length; j++){
        str = new StringTokenizer(s,"\t\n\r\f,.?!;: ");
        s=phrases[j];
        while(str.hasMoreTokens()){
          result += " ";
          result += translateTo(str.nextToken());
        } 
      }  
    }return result;}
 
 
  public String translateTo(String token){
    token=str.nextToken();
    token=token.toLowerCase();
    if((token.charAt(0)=='a' || token.charAt(0)=='e' || token.charAt(0)=='i' ||
        token.charAt(0)=='o' || token.charAt(0)=='u')){
      token = (token+"ay");
    }
    else{
      token = token.substring(1) + "ay"; 
    }
    return token;
  }
 
  public void pigReport(){
    System.out.println(pigAll());
  }
}