How I convert string array to a integer?

Question

String str[] = {2,1,4};

How to get this output into a integer ?like value= 214??

Answer 1

You can also work with Integer.valueOf();

String[] arr = {"2", "1", "4"};
String str = "";

//creates the String "214"
for(String s : arr){

str += s;
}

int num = Integer.valueOf(str);
System.out.println(num);

Answer 2

I solved this 2 ways represented by 2 methods below.

Notice that I turned your String array into an array of int since String str[] = {2, 1, 4} can't compile:

import java.util.*;

public class Program
{
private static int arrayToInt(int[] digitArray)
{
int result = digitArray[0];
for (int i = 1; i < digitArray.length; i++)
{
result *= 10;
result += digitArray[i];
}
return result;
}

private static int arrayToInt2(int[] digits)
{
return Integer.parseInt(Arrays.toString(digits).replaceAll("[\\[\\]\\,\\s]", ""));
}

public static void main(String[] args) {
int digits[] = {2,1,4};
System.out.println(arrayToInt(digits));
System.out.println(arrayToInt2(digits));
}
}

Answer 3

Denise, yeah. That's similar to my arrayToInt2 method which converts the array to a string, removes the undesirable brackets, commas, and whitespaces, before using Integer.parseInt.

Answer 4

Josh Greig Yes. I just wanted to show that you also can convert a String array to int.
I like your regex solution.

Answer 5

Thank you so much sir