public static void main(String[] args) {
        int[] arr1 = new int[] { 1, 2, 3, 4, 5, 6, 7, 8, 9 };
        int[] arr2 = new int[arr1.length];

        printWithSeperatorUsingForLoop(',', arr1);
        printWithSeperatorUsingWhileLoop('-', arr2);

        reverseArrayCopyWithForLoop(arr1, arr2);
        reverseArrayCopyWithWhileLoop(arr1, arr2);

        printWithSeperatorUsingDoWhileLoop(',', arr1);
        printWithSeperatorUsingForLoop('-', arr2);
    }

    private static void printWithSeperatorUsingForLoop(char seperator, int[] array) {
        for(int i = 0; i < array.length; i++) {
            System.out.print(array[i]);

            if(i < array.length - 1) {
                System.out.print(seperator);
            } else {
                System.out.println();
            }
        }
    }

    private static void printWithSeperatorUsingWhileLoop(char seperator, int[] array) {
        int i = 0;

        while(i < array.length) {
            System.out.print(array[i]);

            if(i < array.length - 1) {
                System.out.print(seperator);
            } else {
                System.out.println();
            }

            i++;
        }
    }

    private static void printWithSeperatorUsingDoWhileLoop(char seperator, int[] array) {
        int i = 0;

        do {
            System.out.print(array[i]);

            if(i < array.length - 1) {
                System.out.print(seperator);
            } else {
                System.out.println();
            }

            i++;
        } while(i < array.length);
    }

    private static void reverseArrayCopyWithForLoop(int[] source, int[] destination) {
        for(int i = source.length - 1; i >= 0; i--) {
            destination[i] = source[i];
        }
    }

    private static void reverseArrayCopyWithWhileLoop(int[] source, int[] destination) {
        int i = source.length - 1;
        while(i >= 0) {
            destination[i] = source[i];
            i--;
        }
    }