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In Java. Let's say you're given the following Array. Or something similar

int[] anArray = {10, 20, 30, 40, 1000};

Is there a way to take the length of the array element at anArray[4]; ?

I need to know if the array[x] is == 4. As in 2004, or 1000, or 1968.

How can i do this?

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  • 1
    What do you mean by length of an array element? Commented Feb 27, 2011 at 0:17

5 Answers 5

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5

You can convert the element to a string and get the length of the string, or if its integers you can test if it's between 1000 and 9999.

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3

Convert your array object to string and check is length :

anArray[x].toString().length
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I doubt that the compiler is going to like this. You can't dereference an int and this isn't a case where autoboxing is going to be used.
1

You could convert the element to a string and then find the length of the string.

You could also use repeated division by 10 in a while loop to find your answer.

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1 
if (Integer.toString(anArray[x]).length() == 4) {
    // it's 4 long
}
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0

Slightly geekier approach:

int lengthOfElement4 = (int) Math.floor((Math.log(anArray[4]) / Math.log(10) + 1);

@Mark's second option will probably be quicker though...

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