Patterns.java

public class Patterns {
    public static void main(String[] args) {
        int n = 5;
        for (int i = 0; i <= n; i++) {
            for (int space=n-i; space >= 1; space--) {
                System.out.print(" ");
            }
            printNumbers(0, i);
        }
        for (int i = n-1; i >= 0; i--) {
            for (int space = 1; space <= (n - i); space++) {
                System.out.print(" ");
            }
            printNumbers(0, i);
        }
        System.out.println();

        for(int i=1; i<=n; i++) {
            for(int space=n-i; space>=1; space--) {
                System.out.print(" ");
            }
            printNumberWithSpace(i, i);
        }
        System.out.println();

      for(int i=1; i<=n; i++) {
            for(int space=n-i; space>=1; space--) {
                System.out.print(" ");
            }
            printStarWithSpace(i);
        }
        for(int i=n-1; i>=1; i--) {
            for(int space=1; space<=n-i; space++) {
                System.out.print(" ");
            }
            printStarWithSpace(i);
        }
    }

    public static void printNumbers(int start, int end) {
        for(int i=start; i<=end; i++) {
            System.out.print(i);
        }
        for(int i=(end - 1); i>=start; i--) {
            System.out.print(i);
        }
        System.out.println();
    }

    public static void printNumberWithSpace(int number, int times) {
        for(int i=1; i<=times; i++) {
            System.out.print(number+" ");
        }
        System.out.println();
    }

    public static void printStarWithSpace(int times) {
        for(int i=1; i<=times; i++) {
            System.out.print("* ");
        }
        System.out.println();
    }
}