需要帮助将文本输出居中

Question

import java.util.Scanner;

public class diamond {
    public static void main (String[] args){

        Scanner scan = new Scanner(System.in);

        System.out.println("Please enter an integer");
        int lines = scan.nextInt();

        for(int counter = 1; counter <= lines; counter++)
        {   
            if (counter%2 != 0)
            {
                for(int count2 = 1; count2 <= counter; count2++){
                System.out.print("*");
                }
            System.out.println();
            }
        }
    }
}

I am supposed to ask the user for a number of lines and output a diamond made of asterisks that number of lines tall. I need some help figuring out how to center the asterisks. I know for strings there is some String.utils method or something, but the output comes in pieces based on a for loop, so I don't think that really works here. If it does, by all means let me know though.

Answer 1

You need to print a certain amount of spaces before each line. Then, you would need another for loop for the opposite. Try this code:

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

    System.out.println("Please enter an integer ");
    int lines = scan.nextInt();

    for (int counter = 1; counter <= lines; counter++) {

        if (counter % 2 != 0) {
            for (int i = 0; i < lines - (counter / 2) - 3; i++) {
                System.out.print(" ");
            }
            for (int count2 = 1; count2 <= counter; count2++) {
                System.out.print("*");
            }
            System.out.println();
        }
    }
    for (int counter = lines - 1; counter >= 1; counter--) {

        if (counter % 2 != 0) {
            for (int i = 0; i < lines - (counter / 2) - 3; i++) {
                System.out.print(" ");
            }
            for (int count2 = 1; count2 <= counter; count2++) {
                System.out.print("*");
            }
            System.out.println();
        }
    }
}

Answer 2

我认为您应该准备一个字符串以在每行上打印出来，然后您将确切知道它有多少个字符，当行增加时，请删除字符串中心的两个“ *”并在其前面添加一个“” ，然后再次打印出来。