Bubble sorting
 

hello, guys i have a really stupid problem about characters and string; i dont know which to use. wacko.gif
iam bubble sorting for example a name::'( :?:

input:

dreamincode


output:

a c d d e e i m n o

why does my code in error? my compiler saids the ff:

Exception in thread "main" java.lang.Error: Unresolved compilation problems:

    The local variable characterArray may not have been initialized

    The local variable characterArray may not have been initialized

    The local variable characterArray may not have been initialized



    at BubbleSort.main(BubbleSort.java:15)

i try my hardest but as if i try the more error i get.
i try to simplify the error like this short so it wouldn't be so complicated.

import java.util.Arrays;

import java.io.*;



public class BubbleSort {



        /**

         * @param args

         */

        public static void main(String[] args) throws IOException{

                BufferedReader in = new BufferedReader (new InputStreamReader(System.in));

                char characterArray[];

                

                System.out.print("Enter Name:\t");

                

                Arrays.sort(characterArray);



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

        {

             System.out.print(characterArray[i]);

             System.out.print(", ");

        }

                



        }



}

can you please help me??
i really need your help.
Thnks so much

Re: Bubble sorting
 

You need to initialize your character array something like this:-

char characterArray[] = new char[charArraySize];

where the "charArraySize" implies the dimension for your array, you can replace it with 10,20, 30 or ask the user to input it.

Also how come I do not see the line where you are taking the input from the console ??

Re: Bubble sorting
 

i must have erased it so thats why my code is very complicated i forgot
and oh! by the way do is still need to use string ???
because BufferedReader Only reads as String right? so how can i make the string be character..
:-/

for example iam declaring an integer:

String = input;

int num;



System.out.print("******");

num = Integer.parseInt (input = in.readLine());

how can i make it like a character or should i declare a character directly with out declaring a string???
and
if the array is 20 should i write it this way?

char characterArray[20] = new char[charArraySize];

:icon_question: :confused:
iam kinda lost please help further explanation.

Re: Bubble sorting
 

I said

char characterArray[] = new char[charArraySize];

I had said replace "charArraySize" with the appropriate size.
So if your array size is 20 it should be:-

char characterArray[] = new char[20];

And no BufferedReader can also read a character at a time. Refer here for more details on that.

Heres the javadocs of the String class of Java, it provides a function to export the data in a given String to a char array directly, so you wouldn't even have to initialize the char array the way we have discussed anyways.

Re: Bubble sorting
 

really many thanks to you.. i wish i could do something for you too
THAnks so much:)

Re: Bubble sorting
 

>really many thanks to you.. i wish i could do something for you too

Well, you could mark the thread as "Solved" and leave him a favorable reputation comment on the post.