Simple example of converting an Arraylist to a String array and String array to an ArrayList and "adding" an element to a String array

ArraysSample.java

import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;

public class ArraysSample {
    public static void main(String[] args) {
        List<String> list = new ArrayList<>();                   // Create an ArrayList of Strings
        list.add("CSU");                                         // Add a String to the ArrayList
        list.add("Global");                                      // Add a String to the ArrayList
        System.out.printf("%s%n", list.toString());              // Print the ArrayList [CSU, Global]
        String[] stringArray = list.toArray(new String[0]);      // Convert the ArrayList to an array of Strings
        System.out.println(stringArray);                         // Prints the OBJECT,
                                                                 // example: [Ljava.lang.String;@378bf509
        System.out.println(Arrays.toString(stringArray));        // Prints the array [CSU, Global]
        String[][] stringArray2d = {{ "CSU", "Global" },         // Create a 2D array of Strings
                { "CSC", "320" }};
        System.out.println(Arrays.toString(stringArray2d));      // Prints the OBJECTS in the 2d Array,
                                                                 // example: [[Ljava.lang.String;@5fd0d5ae,
                                                                 // [Ljava.lang.String;@2d98a335]
        System.out.println(Arrays.deepToString(stringArray2d));  // Prints the 2D array [[CSU, Global], [CSC, 320]]
        stringArray = addElement(stringArray, "CSC");            // Uses the addElement() method
                                                                 // to add a String to the array.
        stringArray = addElement(stringArray, "320");            // adds another String to the array.
        System.out.println(Arrays.toString(stringArray));        // Prints the "modified" array [CSU, Global, CSC, 320]
        List<String> ArrayList = Arrays.asList(stringArray);     // Converts the String array to a List
        System.out.printf("%s%n", ArrayList.toString());         // Prints the converted List [CSU, Global, CSC, 320]

    }

    /**
     * Method to "add" an element to an immutable array.
     * @param array the array to add the element to.
     * @param element the element to add to the array.
     * @return an array with the element added to it.
     */
    public static String[] addElement(String[] array, String element) {
        String[] newArray = new String[array.length + 1];        // Create a new String[] with length +1
        System.arraycopy(array, 0, newArray, 0, array.length);   // Copy the elements to the new array
        newArray[newArray.length - 1] = element;                 // Add the new element to the new array
        return newArray;                                         // Return the modified new array
    }
}