alphabet array

[geebanga88]

HI i have a method that is supose to store the alphabet in an array however dont think that it is being added to the array.

 
public static void GetAlphabet (char alphabet[]) { 
       int index, ordinalVal = 97; 
       char element;  
 
 
       for (index = 1; index < alphabet.length; ++index, ++ordinalVal) {
           element = (char) ordinalVal; 
           System.out.println("Letter: " + element); 
           alphabet[index] = element;
           System.out.println("Letter: " + alphabet[index]); 
 
       }  
 

The first print will display the letter but after attempting to add it to the array the second print wont work?

[r035198x]

HI i have a method that is supose to store the alphabet in an array however dont think that it is being added to the array.

 
public static void GetAlphabet (char alphabet[]) { 
       int index, ordinalVal = 97; 
       char element;  
 
 
       for (index = 1; index < alphabet.length; ++index, ++ordinalVal) {
           element = (char) ordinalVal; 
           System.out.println("Letter: " + element); 
           alphabet[index] = element;
           System.out.println("Letter: " + alphabet[index]); 
 
       }  
 

The first print will display the letter but after attempting to add it to the array the second print wont work?

See also this thread.

[geebanga88]

Are u saying instead of using an 'int index' i should make it a 'char index' starting at char 'a'?

[r035198x]

Are u saying instead of using an 'int index' i should make it a 'char index' starting at char 'a'?

Just pointing out a thread where the alphabet was printed that's all.

[geebanga88]

Ok i have this:

 public static void GetAlphabet (char alphabet[]) { 
       int ordinalVal = 97; 
       char index, element;  
 
 
       for (index = 'a'; index <= 'z'; ++index, ++ordinalVal) {
           element = (char) ordinalVal; 
           System.out.println("Letter: " + element); 
           alphabet[index] = element;
           System.out.println("Letter: " + alphabet[index]); 
 
       }   
 

But i get error:
Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException: 97
at Main.GetAlphabet(Main.java:38)
at Main.main(Main.java:19)
Java Result: 1

[geebanga88]

AH k, i just think theres a problem with storing all the letters in the array cause i dont think they are being stored.

[r035198x]

Ok i have this:

 public static void GetAlphabet (char alphabet[]) { 
       int ordinalVal = 97; 
       char index, element;  
 
 
       for (index = 'a'; index <= 'z'; ++index, ++ordinalVal) {
           element = (char) ordinalVal; 
           System.out.println("Letter: " + element); 
           alphabet[index] = element;
           System.out.println("Letter: " + alphabet[index]); 
 
       }   
 

But i get error:
Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException: 97
at Main.GetAlphabet(Main.java:38)
at Main.main(Main.java:19)
Java Result: 1

int counter = 0;
       for (index = 'a'; index <= 'z'; index++, counter++) {
                     alphabet[counter] = index;
 // .....

[JosAH]

int counter = 0;
       for (index = 'a'; index <= 'z'; index++, counter++) {
                     alphabet[counter] = index;
 // .....

Look ma! No counter variable!

for (char index= 'a'; index <= 'z'; index++)
   alphabet[index-'a']= index;
 

Look ma! No loop!

char[] alphabet= "abcdefghijklmnopqrstuvwxyz".toCharArray();
 

kind regards,

Jos ;-)

[r035198x]

Look ma! No counter variable!

for (char index= 'a'; index <= 'z'; index++)
   alphabet[index-'a']= index;
 

Look ma! No loop!

char[] alphabet= "abcdefghijklmnopqrstuvwxyz".toCharArray();
 

kind regards,

Jos ;-)

Don't start chasing all the kids away again ...

P.S Where were you?

[JosAH]

Don't start chasing all the kids away again ...

P.S Where were you?

Sorry 'squire; I was out of my office: contract hunting ;-)

kind regards,

Jos

[geebanga88]

Ah thank for the help Josh much better without a loop:)

i just have one more problem.
I have to methods that get the data for a string and the array. But when i return to main i dont think the data put in by the methods is stored?

 
public static void main(String[] args) {
 
       String sentence = new String();
       char alphabet[] = new char [26]; 
 
       GetString(sentence);
       GetAlphabet(alphabet);
 
    }
   public static void GetString (String sentence) { 
 
       System.out.println("Please enter a string: "); 
       sentence = Keybd.in.readLine(); 
 
       return; 
 
   } 
 
   public static void GetAlphabet (char alphabet[]) { 
 
       alphabet= "abcdefghijklmnopqrstuvwxyz ".toCharArray(); 
 
     return;
   }
 

Not sure the array and string dont return the data because arent all complex data types stored by reference? If i had a a system.out.print to display the string and array index in mian it wont show anyrthing?

[r035198x]

Ah thank for the help Josh much better without a loop:)

i just have one more problem.
I have to methods that get the data for a string and the array. But when i return to main i dont think the data put in by the methods is stored?

 
public static void main(String[] args) {
 
       String sentence = new String();
       char alphabet[] = new char [26]; 
 
       GetString(sentence);
       GetAlphabet(alphabet);
 
    }
   public static void GetString (String sentence) { 
 
       System.out.println("Please enter a string: "); 
       sentence = Keybd.in.readLine(); 
 
       return; 
 
   } 
 
   public static void GetAlphabet (char alphabet[]) { 
 
       alphabet= "abcdefghijklmnopqrstuvwxyz ".toCharArray(); 
 
     return;
   }
 

Not sure the array and string dont return the data because arent all complex data types stored by reference? If i had a a system.out.print to display the string and array index in mian it wont show anyrthing?

Java passes everything by value.
You should have your methods returning values and then in your main method you should be storing those values in some values. Both methods don't need to take any parameters.

P.S I hope you didn't use Jos' method as a excuse to avoid learning loops. He posted so that you can see all the possible (and best ) methods of doing it but you should know and understand them all if you want to learn Java properly.

[geebanga88]

Can u provide an example using that code, im getting confused because if i take away the parameters netbeans tells me that it cannot find the symbol "sentence" in the methods.

[r035198x]

Can u provide an example using that code, im getting confused because if i take away the parameters netbeans tells me that it cannot find the symbol "sentence" in the methods.

Then you have to declare those variables in those methods.

[geebanga88]

sorry it cant find symbol in main but thats where i declared it?

[r035198x]

sorry it cant find symbol in main but thats where i declared it?

Perhaps if you post what you have we can see you are talking about now.

P.S: The error messages usually give you some hints on how to solve the problem.

[geebanga88]

Here my code:

 
 public static void main(String[] args) {
        int index =5;
       String sentence = new String();
       char alphabet[] = new char [26]; 
 
       GetString(sentence);
       GetAlphabet(alphabet);
       System.out.println("Letter 5: " + alphabet[index]); //Here the f wont be printed because i dont think the data is being stored in the array, samething for the string.
       StoreCharacters(sentence, alphabet);
    }
   static void GetString (String sentence) { 
 
       System.out.println("Please enter a string: "); 
       sentence = Keybd.in.readLine(); 
 
       return; 
 
   } 
 
   static void GetAlphabet (char alphabet[]) { 
       int index = 5;
       alphabet= "abcdefghijklmnopqrstuvwxyz ".toCharArray(); 
        System.out.println("Letter 5: " + alphabet[index]); // This will print f 
     return;
   } 
 
 

[r035198x]

Here my code:

 
 public static void main(String[] args) {
        int index =5;
       String sentence = new String();
       char alphabet[] = new char [26]; 
 
       GetString(sentence);
       GetAlphabet(alphabet);
       System.out.println("Letter 5: " + alphabet[index]); //Here the f wont be printed because i dont think the data is being stored in the array, samething for the string.
       StoreCharacters(sentence, alphabet);
    }
   static void GetString (String sentence) { 
 
       System.out.println("Please enter a string: "); 
       sentence = Keybd.in.readLine(); 
 
       return; 
 
   } 
 
   static void GetAlphabet (char alphabet[]) { 
       int index = 5;
       alphabet= "abcdefghijklmnopqrstuvwxyz ".toCharArray(); 
        System.out.println("Letter 5: " + alphabet[index]); // This will print f 
     return;
   } 
 
 

Don't you think that a getString method should return a String?

    static String getString () { 
                        System.out.println("Please enter a string: "); 
                 String sentence = Keybd.in.readLine(); 
                        return sentence; 
       } 

And you can then get the String in your main method using

String sentence = getString();

Do the same thing for the char[].

[geebanga88]

i see what you are saying but i still get these errors: Ive declared the string in main?

 
 public static String GetString () { 
       System.out.println("Please enter a string: "); 
       sentence = Keybd.in.readLine(); // // Cannot Find symbol, variable sentence Location class Main
 
       return sentence;  // Cannot Find symbol, variable sentence Location class Main
 

[r035198x]

i see what you are saying but i still get these errors: Ive declared the string in main?

 
 public static String GetString () { 
       System.out.println("Please enter a string: "); 
       sentence = Keybd.in.readLine(); // // Cannot Find symbol, variable sentence Location class Main
 
       return sentence;  // Cannot Find symbol, variable sentence Location class Main
 

Read the code in my previous reply. It's different from what you wrote.

[geebanga88]

ops i see, ah thanks for the help