Cut and save as array (with.Java)

This is an article about the problem of “Cut and save as an array (with.Java)”.

As I solve coding test problems, I look back on the problems I solved and look into different solution methods to learn more.

Let’s look at the problem first.

problem

When the strings my_str and n are given as parameters, complete the solution function to return an array that cuts my_str by length n and stores it.

Restrictions

• 1 ≤ length of my_str ≤ 100
• 1 ≤ n ≤ length of my_str
• my_str consists of lowercase letters, uppercase letters, and numbers.

Input/Output Example

My solution to the problem

class Solution {
     public String[] solution(String my_str, int n) {
         int length = my_str.length();
         int arrayLength = (int) Math.ceil((double) length / n);

         String[] answer = new String[arrayLength];

         for (int i = 0; i < arrayLength; i++) {
             int start = i * n;
             int end = Math.min(start + n, length);
             answer[i] = my_str.substring(start, end);
         }

         return answer;
     }
}

Solution explanation

• Calculate string length: Calculate the length of the given string and store it in the length variable.
• Calculating the length of the array to be divided: To calculate the length of the array to divide the string into, divide the string length by the given length, perform a rounding operation, and add one array if the remainder occurs. Store this value in the arrayLength variable.
• Create an array to store the results: Create a string array of length arrayLength and store it in the answer variable.
• Divide the string into a certain length and store it in an array: Divide the string into a certain length through a for loop and store each substring in the answer array. The starting index is calculated as i * n, the ending index is start + n, but if it is the last part, it cannot be greater than the length of the string, so we use Math.min to choose the smaller of the two values.
• Return result array: Returns an answer array containing the divided substrings.

Code Advantages

• Flexibility of dividing a string by a certain length: Provides a general way to divide a given string into a desired length and store it in an array.
• Dynamically adjust the size of the array according to the length of the string: Use memory efficiently by dynamically adjusting the size of the array according to the length of the input string.

Code Disadvantages

• Array size may vary depending on string length: The size of the array may vary depending on the length of the string and the given length, which may result in unexpected memory usage.
• Immutability of arrays of split substrings: Once a split substring is stored in an array, it cannot be changed, and the substring cannot be modified later.