如何在 java 的一行中打印一个字符串块

Question

I'm new to java and i found an activity that needs you to print a block of strings based on a count of a loop. The input should be:

 Input Format:
     2
     1
     3

And the output must be:

    *     *
   **    **
  ***   ***
 ****  ****
***** *****

    *
   **
  ***
 ****
*****

    *     *     *
   **    **    **
  ***   ***   ***
 ****  ****  ****
***** ***** *****

I'm having a hard time doing this because i can't print it in one line. Here's my code:

import java.util.Scanner;
public class Main
{
  public static void main (String[]args)
  {
    Scanner sc = new Scanner (System.in);
    int num1, num2, num3;
      num1 = Integer.parseInt (sc.nextLine ());
      num2 = Integer.parseInt (sc.nextLine ());
      num3 = Integer.parseInt (sc.nextLine ());

    String barricade = "      *\n"
                     + "     **\n" 
                     + "    ***\n" 
                     + "   ****\n" 
                     + "  *****\r";

    for (int i = 0; i < num1; i++)
    {
       System.out.print(barricade);
    }
  }
}

Answer 1

Here is a working script:

Scanner sc = new Scanner (System.in);
String[] lines = {"      *", "     **", "    ***", "   ****", "  *****"};
int input = Integer.parseInt(sc.nextLine());
for (int i=0; i < lines.length; ++i) {
    for (int j=0; j < input; ++j) {
        System.out.print(lines[i]);
        System.out.print(" ");
    }
    System.out.println();
}

We can use a nested loop here, where the outer loop iterates over the lines of the triangle, and the inner loop controls how many triangles get printed on each line. For an input of 3, this generated:

      *       *       *
     **      **      **
    ***     ***     ***
   ****    ****    ****
  *****   *****   *****

Answer 2

You're very close to a working solution now, instead of making barricade a String with embedded new lines; make it an array. I also would prefer sc.nextInt() to hardcoding three calls to Integer.parseInt() and I would further make num1 - num3 an array. Like,

int[] nums = { 2, 1, 3 }; // { sc.nextInt(), sc.nextInt(), sc.nextInt() };
String[] barricade = {
        "      *",
        "     **",
        "    ***",
        "   ****",
        "  *****" };
for (int num : nums) {
    for (String line : barricade) {
        for (int j = 0; j < num; j++) {
            System.out.print(line);
        }
        System.out.println();
    }
    System.out.println();
}