java從鍵盤獲取日期，輸出后一天的日期

import java.util.Scanner;
class Demo
{
    public static void main(String[] args)
    {
        //日期輸入部分
        char[] time = new char[10];
        String str;
        Scanner sc = new Scanner(System.in);
        int year,month=1,day=1;
        System.out.println("please enter a time eg:xxxx-xx-xx");
        str = sc.nextLine();
        for (int i = 0; i < str.length(); i ++)
        {
            time[i] = str.charAt(i);        
        }
        year  =(time[0]-'0')*1000+(time[1]-'0')*100+(time[2]-'0')*10+(time[3]-'0');
        month =(time[5]-'0')*10+(time[6]-'0');
        day   =(time[8]-'0')*10+(time[9]-'0');
        System.out.println("The time you entered is:"+year+"-"+month+"-"+day);
        /*panduan riqi shifou zhengque*/
        if(month<1||month>12||day<1||day>31)
            System.out.println("Please enter the correct time!!!");
        /*ruguo shurude shijian zhengque ,ze shuchu hou yitian de shijian*/
        else if(month!=12&&day==31)
            System.out.println("The day after is:"+year+"-"+(month+1)+"-"+"0");
        else if(month==12&&day==31)
            System.out.println("The day after is:"+(year+1)+"-"+"0"+"-"+"0");
        else
            System.out.println("The day after is:"+year+"-"+month+"-"+(day+1));
    }
}