CODEWITHSUNDEEP
javastringinteger
Code Enthusiastic
Code Enthusiastic

Reputation: 2847

Converting Array of Strings to Array of Integers

Assumptions:

  1. Each String in the String Array is type Double.

  2. Some Strings in the String Array may be null.

  3. Whenever a string in String Array is null, its corresponding Integer in Integer Array should have a value of 0.

Edit: After converting successfully I want to return this created Integer Array.

I am stuck in the places where Strings are null, getting NumberFormatException in the places where Strings are null.

Thanks in Advance.

Upvotes: 0

Views: 187

Answers (4)

SamYonnou
SamYonnou

Reputation: 2068

So you want to convert your Strings to Integers even though they store doubles? If so then something like this should work:

for (int i = 0; i < stringArray.length; i++) {
    String s = stringArray[i];
    if (s == null || s.isEmpty()) {
        integerArray[i] = new Integer(0);
    } else {
        integerArray[i] = new Integer(s.substring(0,s.indexOf(".")));
    }
}

Upvotes: 2

TechSpellBound
TechSpellBound

Reputation: 2555

Hope this helps!

    public class Test {

        public static void main(String[] args) {
            String[] strArray = {"1.1", "2.2", null, "3.3"};
            Integer[] intArray = new Integer[4];
            for (int i = 0; i < strArray.length; i++) {
                intArray[i] = (strArray[i] == null) ? 0 : (int) Double.parseDouble(strArray[i]);
            }
            System.out.println("String array = ");
            for (String str : strArray) {
                System.out.print(str + " ");
            }
            System.out.println();
            System.out.println("Integer array = ");
            for (Integer integer : intArray) {
                System.out.print(integer + " ");
            }
        }
    }

Upvotes: 3

Jordan Kaye
Jordan Kaye

Reputation: 2887

A simple ternary operator will do it:

String[] s = //Array instantiation
double d = new double[s.length];
for(int i = 0; i < s.length; i++)
{
    d[i] = s[i] == null ? 0 : Double.parse(s[i]);
}

Upvotes: 2

Gilbert Le Blanc
Gilbert Le Blanc

Reputation: 51445

Before you convert the String to Double, you use an if statement to check if the String is equal to null.

If the String is equal to null, move zero to the Integer array, else do the String to Double conversion, convert the Double to an Integer, and put the Integer in the Integer Array.

Upvotes: 3

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