ゼロ以外の値を右にシフトする : 一般的な配列インタビューの問題-2

Input: [1, 2, 0, 3, 0, 0, 4, 0, 2, 9]
Output: [0, 0, 0, 0, 1, 2, 3, 4, 2, 9]

package arrays;

// Time Complexity - O(n)
// Space Complexity - O(1)
public class ShiftNonZeroValuesToRight {

    private void shiftValues(int[] inputArray) {

        /* Variable to keep track of index position to be 
           filled with Non-Zero Value */
        int pointer = inputArray.length - 1;

        // If value is Non-Zero then place it at the pointer index
        for (int i = pointer; i >= 0; i--) {

            /* If there is a non-zero already at correct position,
               just decrement position */
            if (inputArray[i] != 0) {

                if (i != pointer) {
                    inputArray[pointer] = inputArray[i];
                    inputArray[i] = 0;
                }

                pointer--;
            }
        }

        // Printing result using for-each loop
        for (int i : inputArray) {
            System.out.print(i);
        }

        System.out.println();

    }

    public static void main(String[] args) {

        // Test-Case-1 : Ending with a Non-Zero
        int input1[] = { 1, 2, 0, 3, 0, 0, 4, 0, 2, 9 };

        // Test-Case-2 : Ending with Zero
        int input2[] = { 8, 5, 1, 0, 0, 5, 0 };

        // Test-Case-3 : All Zeros
        int input3[] = { 0, 0, 0, 0 };

        // Test-Case-4 : All Non-Zeros
        int input4[] = { 1, 2, 3, 4 };

        // Test-Case-5 : Empty Array
        int input5[] = {};

        // Test-Case-6 : Empty Array
        int input6[] = new int[5];

        // Test-Case-7 : Uninitialized Array
        int input7[];

        ShiftNonZeroValuesToRight classObject = new ShiftNonZeroValuesToRight();
        classObject.shiftValues(input1); // Result : 0000123429
        classObject.shiftValues(input2); // Result : 0008515
        classObject.shiftValues(input3); // Result : 0000
        classObject.shiftValues(input4); // Result : 1234
        classObject.shiftValues(input5); // Result :
        classObject.shiftValues(input6); // Result : 00000
        classObject.shiftValues(input7); // Result : Compilation Error - Array may not have been initialized

    }
}