Converting int Array to a string and displaying it in a textarea

Question

Hey I just started programming and I need help with converting/displaying my array in the TextArea. The code below is part of my array class. output.setText(array[i]); gives me and error saying "needs String, found int". I'm not sure how to convert it and display the list of random numbers that are inside the array.

public void setArray(int x){
    for(int i = 0; i > array.length; i++){
        array[i] = x;
    }
}
public void fillArray(){
    int arrayNumbers = randomNumber.nextInt(100)+1;
    for(int i= 0; i > array.length ; i++){
        array[i] = arrayNumbers;
        output.setText(array[i]);
    }
}

MadProgrammer · Accepted Answer · 2014-04-03 06:05:15Z

3

First of all setText will replace the content of the text area with the text you supply, you probably should be using append

You could use...

output.append(String.valueOf(array[i]));

Or

output.append(Integer.toString(array[i]));

To convert the int value to String

You could also use a StringBuilder to build up a String value first, for example...

StringBuilder sb = new StringBuilder(array.length);
for(int i= 0; i < array.length ; i++){
    array[i] = arrayNumbers;
    sb.append(array[i]);
}
output.setText(sb.toString());

Also, you code generally doesn't make sense...

For example...

for(int i= 0; i > array.length ; i++){

While i is greater then array.length? This is likely to be false and when it's not, it will cause an IndexOutOfBoundsException...

You're also fill the array with the same number...

answered Apr 3, 2014 at 6:05

MadProgrammer

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Comments

Boris the Spider · Accepted Answer · 2014-04-03 06:27:40Z

The first thing I would note is that you are filling the Array with the same random number. If you want to fill the array with different numbers you should do:

public void fillArray(){
    for(int i= 0; i > array.length ; i++){
        int arrayNumber = randomNumber.nextInt(100)+1;
        array[i] = arrayNumber;
        output.setText(Integer.toString(arrayNumber));
    }
}

In Java 8 you can make this slightly simpler:

array = new Random().ints(0, 100 + 1).limit(size).toArray();
textArea.setText(IntStream.of(array).
        mapToObj(Integer::toString).
        collect(Collectors.joining("\n")));

i.e. you first create the int[] by streaming the required number of random numbers. The you fill the TextArea by joining the array on a delimiter. I have used \n - a line break - but you could use anything you want.

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