Java - Return an integer array

Question

In this function, I want to get text in the file then convert it from string to decimal values, by add this text to an array apply some loops and put the result to array of integer. While returning this integer array it gives me an error "cannot find symbol variable integerArray"

    int[] inputfile () throws Exception{
     BufferedReader br = null;
       String sCurrentLine;
       String message;
       br = new BufferedReader(new FileReader("\input.txt"));
       while ((sCurrentLine = br.readLine()) != null) {
           message=sCurrentLine.toString();
       char[] messageArray=message.toCharArray();

        int[] integerArray = new int[messageArray.length];
           for(int i=0; i<messageArray.length; i++)
               integerArray[i] = (int)messageArray[i];

       }
       return integerArray;
   }

How can I solve it?

Update: I declared variable integerArray outside the while loop, but it always returns the null value, Is there any possible way to return integerArray as int values? because Arrays.toString(integerArray) returns String representation of that array

    int[] inputfile () throws Exception{
     BufferedReader br = null;
       String sCurrentLine;
       String message;
       br = new BufferedReader(new FileReader("\\input.txt"));
       int[] integerArray = null
       while ((sCurrentLine = br.readLine()) != null) {
           message=sCurrentLine.toString();
       char[] messageArray=message.toCharArray();

        int[] integerArray = new int[messageArray.length];
           for(int i=0; i<messageArray.length; i++)
               integerArray[i] = (int)messageArray[i];

       }
       return integerArray;

Maroun · Accepted Answer · 2016-03-23 12:46:14Z

4

Your integerArray is inside the while loop. Declare it outside the loop and change its value inside it, then it will work.

edited Mar 23, 2016 at 12:46

Maroun

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answered Mar 23, 2016 at 12:43

dryairship

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Comments

Maroun · Accepted Answer · 2016-03-23 12:46:38Z

4

integerArray is a local variable in the while loop , it's inaccessible outside it. Declare it outside the loop

int[] integerArray =null ;
while ((sCurrentLine = br.readLine()) != null) {
    // other code
    integerArray   = new int[messageArray.length];
        // other code
}

edited Mar 23, 2016 at 12:46

Maroun

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answered Mar 23, 2016 at 12:43

Ramanlfc

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1 Comment

Sarah Mohamed Over a year ago

The result after applying this is the null value !

Eran · Accepted Answer · 2016-03-23 12:43:19Z

3

int[] integerArray must be declared before the loop, in order for you to be able to return it after the loop.

int[] inputfile () throws Exception{ 
   int[] integerArray = null;
   BufferedReader br = null;
   String sCurrentLine;
   String message;
   br = new BufferedReader(new FileReader("\input.txt"));
   while ((sCurrentLine = br.readLine()) != null) {
       message=sCurrentLine.toString();
       char[] messageArray=message.toCharArray();
       integerArray = new int[messageArray.length];
       for(int i=0; i<messageArray.length; i++)
           integerArray[i] = (int)messageArray[i];
   }
   return integerArray;

}

answered Mar 23, 2016 at 12:43

Eran

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6 Comments

Sarah Mohamed Over a year ago

I tried this but the result was "[I@15db9742" , btw my text file contains "Hello"

Eran Over a year ago

@SarahMohamed That just means you are printing the array incorrectly. Use System.out.println(Arrays.toString(inputfile())); to print the output of this method.

Sarah Mohamed Over a year ago

While trying this I found that it returns me a string value, Is there any possible way to return these values in integer?

Eran Over a year ago

@SarahMohamed What do you mean ? Your method returns an integer array.

Sarah Mohamed Over a year ago

Yes, it is. but after using Arrays.toString it returns a String value!

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