有没有一种方法可以从字符串遍历到int数组，反之亦然

Question

In Java, given the array

int a[] = {1,2,3}

I can do Arrays.toString(a) to get

"[1,2,3]"

Is there an equally convenient way to return this String back to its antecedent array? Or must I go through the whole split , for-loop, parseInt stuff?

UPDATE

Thanks everyone for all the thoughts. I rolled out my own function as

String src[] = data.split("\\D+");//data is intArrayAsString: [1,2,3]
int[] nums = new int[src.length - 1];
int ndx = 0;
for (String s : src) {
  try {
    nums[ndx] = Integer.parseInt(s);
    ndx++;
  } catch (NumberFormatException e) {
  }
}
return nums;

Note: the word traverse seems to have thrown a few people off. By "traversing" I meant the ability to move back and forth from the string to the int array.

Answer 1

As far as i know, no.

But it's easy to do using Split .

I just did this, if you don't understand how to do it:

int[] arr = {1, 2, 3, 4};
String toString = Arrays.toString(arr);

System.out.println(toString);

// we know it starts with [ and ] so we skip it
String[] items = toString.substring(1, toString.length() - 1).split(",");
int[] arr2 = new int[items.length];
for (int i = 0; i < items.length; ++i)
{
    arr2[i] = Integer.parseInt(items[i].trim()); // .trim() because it adds the space and parseInt don't like spaces
}

System.out.println(Arrays.toString(arr2));

(free to improve it, it's just a draft)

Answer 2

I don't know of any existing method, so I wrote you my own version:

import java.util.Arrays;


public class ArrayToString {

    public static void main(String[] args) {
        int a[] = {1,2,3};
        String serialized = Arrays.toString(a);
        System.out.println(serialized);

        int[] b = stringToIntArray(serialized);

        System.out.println(Arrays.toString(b));
    }

    private static int[] stringToIntArray(String serialized) {

        // remove '[' and ']'
        String raw = serialized.replaceAll("^\\[(.*)\\]$", "$1");

        // split by separators
        String[] splitStrings = raw.split(", ");

        // create new int array
        int[] b = new int[splitStrings.length];
        for (int i = 0; i < splitStrings.length; i++) {
            String splitString = splitStrings[i];

            // parse each text individually
            b[i] = Integer.parseInt(splitString);
        }
        return b;
    }

}