Thread: Array listing problem

Hello!
I'm a beginner in programming, I tried to create a program.. an array and fill it with the ABC, I think it should be OK, and after that I try to list it, but it doesn't works well, I can only see: "Z Z Z Z Z"
What could be the problem?

public class NewClass55 {
    public static void main(String[] args) {
 
    int abcd=0;
    for (char k = 'A'; k <= 'Z'; k++) {
        abcd++;
    }
 
    char[] array = new char[abcd];
 
      for (int j = 0; j < abcd; j++) {
                for (char i = 'A'; i <= 'Z'; i++) {  
                    array[j] = i;
                }
          }
 
    for (int j = 0; j < abcd; j++) {
                System.out.println(array[j]);
          }
 
  }
}

Thanks in advance!

public class NewClass55 {
 
    public static void main(String[] args) {
 
        int abcd = 0;
        char[] alphabetArray = null;
 
        for (char k = 'A'; k <= 'Z'; k++, abcd++) {
        }
        alphabetArray = new char[abcd];
 
        int index = 0;
        for (char i = 'A'; i <= 'Z'; i++) {
            alphabetArray[index] = i;
            if (i == 'Z') {
                System.out.print((alphabetArray[index]) + "\n");
            } else {
                System.out.print((alphabetArray[index]) + ", ");
            }
        }
    }
}

Just a quick fix for you.
Will now print "A,B,C,...,Z" for you.
Some of the code can just be removed if you like, as its just formatting.

If you're after a very basic example:

public class NewClass55 {
 
    public static void main(String[] args) {
        int abcd = 0;
        char[] alphabetArray = new char[26];
 
        for (char i = 'A'; i <= 'Z'; i++, abcd++) {
            alphabetArray[abcd] = i;
            System.out.println(alphabetArray[abcd]);
        }
    }
}

Sorry could you clarify what your specifications are?

also

        for (int i = 0; i < alphabetArray.length; i++) {
            if (alphabetArray[i] == 'A') {
                System.out.println("Hello World!");
            }
        }

Is that what you mean't by reading data from the Array? I.e inspecting it?
The first code I posted only stores @ one index, where as the second has an index for each char, which lets you inspect different values at different indexes.

Sorry If this post wasn't of any help, but I'm unclear as to what you need exactly

Thanks, it was helpful! But if you try this out with the upper code it doesn't work, it doesn't prints out "Hello World!" but in theory (at least I think) it should, that is what I don't understand!

Well, at the beginning I'd like to store a word in a String, for example:

    String text="apple";
    text=text.toUpperCase();

(convert to uppercase because lowercase/uppercase now doesn't matter)
after that store the letters from the word in an array:

    int[] textArray = new int[text.length()];
        for (int i = 0; i < text.length(); i++) {
             textArray[i] = text.charAt(i);
        }

and at the second for loop I'm thinking of comparing the alphabetArray with the textArray, and print those numbers to the screen which are found! Well the only problem left to count how much of them are...
For example currently: A:1, P:2, L:1, E:1

But the comparison doesn't works, because I can't inspect the array, that's why first I tried to print all the numbers in my second for loop, but that didn't work either, and for me the "Hello World!" test didn't work either (maybe I did something wrong?)

Originally Posted by newbie

Sorry could you clarify what your specifications are?

also

        for (int i = 0; i < alphabetArray.length; i++) {
            if (alphabetArray[i] == 'A') {
                System.out.println("Hello World!");
            }
        }

Is that what you mean't by reading data from the Array? I.e inspecting it?
The first code I posted only stores @ one index, where as the second has an index for each char, which lets you inspect different values at different indexes.

Sorry If this post wasn't of any help, but I'm unclear as to what you need exactly

public class NewClass55 {
 
    public static void main(String[] args) {
        int abcd = 0;
        char[] alphabetArray = new char[26];
 
        for (char i = 'A'; i <= 'Z'; i++, abcd++) {
            alphabetArray[abcd] = i;
            System.out.println(alphabetArray[abcd]);
        }
 
        for (int i = 0; i < alphabetArray.length; i++) {
            if (alphabetArray[i] == 'A') {
                System.out.println("Hello World!");
            }
        }
 
        String text = "apple";
        String toUpperCase = text.toUpperCase();
 
        char[] textArray = new char[text.length()];
        for (int i = 0; i < text.length(); i++) {
            textArray[i] = toUpperCase.charAt(i);
        }
        System.out.println(textArray);
 
        for (int i = 0; i < alphabetArray.length; i++) {
            for (int c = 0; c < textArray.length; c++) {
                if (textArray[c] == alphabetArray[i]) {
                    System.out.println("Matched Something!" + textArray[c]);
                }
 
            }
        }
 
    }
}

Now don't take that as complete, but it should hopefully get you started.
Bit of a jumbled class, as I left earlier things in, so you might want to clear it up as well.