如何仅向一行添加空格

Question

I have been trying to make a calendar and have this coded so far:

import java.util.*;
public class MyOwnCalendar {

    public static void main(String[] args) {
        Scanner keyboard = new Scanner(System.in);


        System.out.print("Enter the number of days in month: ");
        int days = keyboard.nextInt();

        System.out.print("Enter which day the first day is on: ");
        int firstDay = keyboard.nextInt();

        System.out.println("S   M   T   W   Th  F   Sa");

        int ctr = 1;

        if (days == 31 && firstDay == 1)
        {
            while (ctr <= days)
            {
                System.out.print(ctr);
                System.out.print("  ");
                ctr++;
                if (ctr == 8 || ctr == 15 || ctr == 22 || ctr == 29)
                {
                    System.out.println();
                }
            }
        }else if (days == 31 && firstDay == 2)
        {
            while (ctr <= days)
            {
                System.out.print("\t");
                System.out.print(ctr);
                System.out.print("  ");
                ctr++;
                if (ctr == 7 || ctr == 14 || ctr == 21 || ctr == 28)
                {
                    System.out.println();
                }
            }
        }

Everything was going well until here. If I enter 31 for days , and 2 for firstDay , this is the output:

Enter the number of days in month: 31
Enter which day the first day is on: 2
S   M   T   W   Th  F   Sa
    1   2   3   4   5   6  
    7   8   9   10  11  12  13              
    14  15  16  17  18  19  20  
    21  22  23  24  25  26  27  
    28  29  30  31  

While the output for 31 days , and 1 for firstDay :

Enter the number of days in month: 31
Enter which day the first day is on: 1
S   M   T   W   Th  F   Sa
1   2   3   4   5   6   7   
8   9   10  11  12  13  14  
15  16  17  18  19  20  21  
22  23  24  25  26  27  28  
29  30  31  

How would I indent only the first line for something like the first calendar I inputted? Also, if there is a more efficient way to code a calendar, instead of doing it like this, I would also greatly appreciate that. I am quite new to programming. I've only been learning for a couple weeks or so.

Answer 1

The while loop is what loops through every line, so just move your new line to only happen for the first time through the loop. (Move System.out.print("t"); above the while loop)

if (days == 31 && firstDay == 2)
{
    System.out.print("\t");
    while (ctr <= days)
    {

Answer 2

import java.util.*; public class MyOwnCalendar {

public static void main(String[] args) {
    Scanner keyboard = new Scanner(System.in);


    System.out.print("Enter the number of days in month: ");
    int days = keyboard.nextInt();

    System.out.print("Enter which day the first day is on: ");
    int firstDay = keyboard.nextInt();

   System.out.printf("%4c%4c%4c%4c%4c%4c%4c%n",'S','M','T','W','T','F','S');

    int ctr = 1;

    if (days == 31 && firstDay == 1)
    {
        while (ctr <= days)
        {
            System.out.printf("%4d",ctr);
           // System.out.print("  ");
             ctr++;
            if (ctr == 8 || ctr == 15 || ctr == 22 || ctr == 29)
            {
                System.out.println();
            }

        }
    }else if (days == 31 && firstDay == 2)
    {
        while (ctr <= days)
        {
            //System.out.print("\t");
            System.out.printf("%4d",ctr);
            //System.out.print("  ");

            if (ctr == 7 || ctr == 14 || ctr == 21 || ctr == 28)
            {
                System.out.println();
            }
              ctr++;
        }
    }
}

}