public class EnhancedWeave {

    public EnhancedWeave(String[] firstArray, String[] secondArray) {
        insWeave(firstArray, secondArray);
    }

    public EnhancedWeave(String firstString, String secondString) {
        int secondStringLength = secondString.length();
        // Check if arguments are valid
        if (firstString.length() != 0 && secondStringLength != 0 && secondStringLength % 2 == 0) {
            // Prepare charArrays for further processing
            char[] firstCharArray = new char[firstString.length()];
            char[] secondCharArray = new char[secondString.length()];

            for (int i = 0; i < firstCharArray.length; i++)
                firstCharArray[i] = firstString.charAt(i);

            for (int i = 0; i < secondCharArray.length; i++)
                secondCharArray[i] = secondString.charAt(i);

            insBracket(firstCharArray, secondCharArray);
        } else
            System.out.println("Invalid arguments");
    }

    public void insBracket(char[] firstSequence, char[] secondSequence) {
        String[] finalArray = new String[firstSequence.length * 3];
        int k = 0, i = 0, j = 0;
        while (k < finalArray.length) {
            if (i == secondSequence.length)
                i = 0;
            if (j == firstSequence.length)
                j = 0;
            if (k % 3 != 1)
                finalArray[k] = "" + secondSequence[i++];
            else
                finalArray[k] = "" + firstSequence[j++];
            k++;
        }
        print(finalArray);
    }


    public void insWeave(String[] firstArray, String[] secondArray) {
        String[] finalArray = new String[2 * secondArray.length - 1];
        int k = 0, i = 0, j = 0;
        while (k < finalArray.length) {
            if (i == secondArray.length)
                i = 0;
            if (j == firstArray.length)
                j = 0;
            if (k % 2 == 0)  // THIS IS THE ONE I'M TALKING ABOUT
                finalArray[k] = secondArray[i++];
            else
                finalArray[k] = firstArray[j++];
            k++;
        }
        print(finalArray);
    }

    public void print(String[] finalArray) {
        for (int i = 0; i < finalArray.length; ) {
            System.out.print(finalArray[i++]);
        }
    }

    public static void main(String... args) {
        new EnhancedWeave(new String[]{"+", "-"}, new String[]{"2", "3", "4", "5", "6", "7"});
        System.out.println();
        new EnhancedWeave(new String[]{"*"}, new String[]{"(2+3)", "(4-5)", "(6+7)"});
        System.out.println();
        new EnhancedWeave("abc", "()[]{}");
        System.out.println();
        new EnhancedWeave("+-", "234567");
    }
}