Solve Any Pattern Question Using This Trick!

Program:

public class Patterns {
    public static void main(String[] args) {
        pattern7(4);

    }
    /*pattern1
     *
     * *
     * * *
     * * * *
     * 4 rows and 4 column */

    static void pattern1(int n) {
        for (int i = 1; i <= n; i++) {// i is row
            for (int j = 1; j <= i; j++) {// j is row
                System.out.print("* ");
            }
            System.out.println();
        }
    }

    /*pattern2
     * * * *
     * * * *
     * * * *
     * * * *
     4 rows and 4 column*/
    static void pattern2(int n) {
        for (int i = 1; i <= n; i++) {// i is row
            for (int j = 1; j <= n; j++) {// j is row
                System.out.print("* ");
            }
            System.out.println();
        }
    }

    /*pattern3
     * * * *
     * * *
     * *
     *
     4 rows and 4 column*/
    static void pattern3(int n) {
        for (int i = 1; i <= n; i++) {// i is row
            for (int j = 1; j <= n - i + 1; j++) {// j is row
                System.out.print("* ");
            }
            System.out.println();
        }
    }

    /*pattern4
    1
    1 2
    1 2 3
    1 2 3 4
     */
    static void pattern4(int n) {
        for (int i = 1; i <= n; i++) {// i is row
            for (int j = 1; j <= i; j++) {// j is row
                System.out.print(j + " ");
            }
            //After printing row add new line
            System.out.println();
        }
    }
    /*pattern5
    *
    * *
    * * *
    * * * *
    * * *
    * *
    4 rows and 4 columns*/

    static void pattern5(int n) {
        for (int i = 0; i < 2 * n; i++) {
            int calumnInRow = i > n ? 2 * n - i : i;
            for (int j = 0; j < calumnInRow; j++) {
                System.out.print("* ");
            }
            //After printing row add new line
            System.out.println();
        }
    }

    /*pattern6
       *
      * *
      * * *
     * * * *
      * * *
       * *
        *
     */
    static void pattern6(int n) {
        for (int i = 0; i < 2 * n; i++) {
            int calumnInRow = i > n ? 2 * n - i : i;
            int space = n - calumnInRow;
            for (int s = 0; s < space; s++) {
                System.out.print(" ");
            }
            for (int j = 0; j < calumnInRow; j++) {
                System.out.print("* ");
            }
            //After printing row add new line
            System.out.println();


        }
    }
    /*pattern7
      1
    2 1 2
  3 2 1 2 3
4 3 2 1 2 3 4
     */
    static void pattern7(int n){
        for(int i = 1; i <= n;i++){
            for(int space = 0;space < n-i;space++){
                System.out.print(" ");
            }
            for(int j = i; j >=1;j--){
                System.out.print(j + " ");
            }
            for(int j = 2; j<=i;j++){
                System.out.print(j + " ");
            }
            System.out.println();
        }
    }
}