Leetcode005 -- delete duplicate elements in the array in place

import java.util.ArrayList;
import java.util.List;
import java.util.Scanner;

public class test05 {
    /**
     *  Here's an ordered array  nums , Would you please   In situ   Delete duplicate elements , Make each element   Only once  , Returns the new length of the deleted array .
     *  Don't use extra array space , You must be there.   In situ   Modify input array   And using  O(1)  Complete with extra space .
     *
     *  explain :
     *  Why is the return value an integer , But the output answer is array ?
     *  Please note that , The input array is based on 「 quote 」 By way of transmission , This means that modifying the input array in a function is visible to the caller .
     *  You can imagine the internal operation as follows :
     * // nums  In order to “ quote ” By way of transmission . in other words , Do not make any copies of the arguments 
     * int len = removeDuplicates(nums);
     *
     * //  Modifying the input array in a function is visible to the caller .
     * //  Based on the length returned by your function ,  It prints out the array   Within this length   All elements of .
     * for (int i = 0; i < len; i++) {
     *      print(nums[i]);
     * }
     *
     *  Example  1：
     *  Input ：nums = [1,1,2]
     *  Output ：2, nums = [1,2]
     *  explain ： Function should return the new length  2 , And the original array  nums  The first two elements of are modified to  1, 2 . You don't need to think about the elements in the array that follow the new length .
     *  Example  2：
     *  Input ：nums = [0,0,1,1,1,2,2,3,3,4]
     *  Output ：5, nums = [0,1,2,3,4]
     *  explain ： Function should return the new length  5 ,  And the original array  nums  The first five elements of are modified to  0, 1, 2, 3, 4 . You don't need to think about the elements in the array that follow the new length .
     *
     *  Tips ：
     * 0 <= nums.length <= 3 * 104
     * -104 <= nums[i] <= 104
     * nums  In ascending order 
     * @param args
     */

    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        System.out.println(" Please enter the size of the array ：");
        int size = sc.nextInt();
        System.out.println(" Please enter an array ：");
        int[] a = new int[size];
        for(int i=0; i<size; i++){
            a[i] = sc.nextInt();
        }

        // Remove duplicate elements 
        int count = 1;
        for(int i=1; i<size; i++){
            if(a[i] != a[count-1]){
                a[count] = a[i];
                count++;
            }
        }

        for(int i=0; i<count; i++){
            System.out.print(a[i]+" ");
        }

    }
}