Java adding items from an INT array to a String array

Question

public static String fibonacci(int a, int b){

        int max = 10;
        String returnValue;

        int[] result = new int[max];
        result[0] = a;
        result[1] = b;
                for (int i1 = 2; i1 < max; i1++) {
                    result[i1] = result[i1 - 1] + result[i1 - 2];
                }
                for (int i3 = 0; i3 < max; i3++) {
                    //Here you can do something with all the values in the array one by one
                    //Maybe make something like this?:
                    int TheINTthatHasToBeAdded = result[i3];
                    //The line where TheINTthatHasToBeAdded gets added to the String returnValue

                }           


        return returnValue;

    }

-

The result array has items that are INTEGERS, returnValue is a string.

My question is; how do I add the items that are in the result array, to the returnValue array?

Gil Tzadikevitch · Accepted Answer · 2014-10-28 21:25:42Z

1

I assume you are trying to return a String containing all the fibonaci numbers you found? If you are, change the following:

StringBuilder returnValue = new new StringBuilder()

Add the following to your 2nd loop

returnValue.append(result[i3]).append(",");

Change the return value to:

return returnValue.toString();

This should solve it (With an extra ',' in the end)

answered Oct 28, 2014 at 21:25

Gil Tzadikevitch

1872 bronze badges

Sign up to request clarification or add additional context in comments.

1 Comment

Shqiptar_Programmer Over a year ago

Yes thanks, I could solve this problem aswell with a simple if-statement within the for-loop to check if the i3 has reached the max int.

Luiggi Mendoza · Accepted Answer · 2014-10-28 21:27:06Z

To convert an array into a String you can use java.util.Arrays.toString:

returnValue = java.util.Arrays.toString(result);

Still, returning a String representation of the calculated array is not a good design. It would be better to return the int[] and let the client to convert this into a String or another way to consume it or display it to the user.

This is how the method may look:

//changed the return type from String to int[]
public static int[] fibonacci(int a, int b) {
    int max = 10;
    int[] result = new int[max];
    result[0] = a;
    result[1] = b;
    for (int i1 = 2; i1 < max; i1++) {
        result[i1] = result[i1 - 1] + result[i1 - 2];
    }
    return result;
}

//in client method, like main
public static void main(String[] args) {
    //store the result of fibonacci method in a variable
    int[] fibonacciResult = fibonacci(0, 1);
    //print the contents of the variable using Arrays#toString
    System.out.println("Fibonacci result:" + Arrays.toString(fibonacciResult));
}

Or even use another way to consume the results. Here's another example:

public static void main(String[] args) {
    //store the result of fibonacci method in a variable
    int[] fibonacciResult = fibonacci(0, 1);
    //print the contents of the variable using Arrays#toString
    StringBuilder sb = new StringBuilder();
    for (int i = 0; i < fibonacciResult.length; i++) {
        sb.append(fibonacciResult[i])
            .append(' ');
    }
    System.out.println("Fibonacci result:" + sb.toString());
}

Collectives™ on Stack Overflow

Java adding items from an INT array to a String array

-

2 Answers 2

1 Comment

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

-

2 Answers 2

1 Comment

Comments

Your Answer

Sign up or log in

Post as a guest

Related