patterns.java

package javaPractice;

import java.util.Scanner;

public class patterns{
    public static void pattern1(int n){
        for(int i = 1; i <= n; i++){
            for(int j = 1; j<= i; j++){
                System.out.print("*" + " ");
            }
            System.out.println();
        }
    }
    public static void pattern2(int n){
        for(int i = 1; i <= n; i++){
            for(int j = 1; j <= i; j++){
                if((i+j)%2==0){
                    System.out.print("1" + " ");
                }else{
                    System.out.print("0" + " ");
                }
            }
            System.out.println();
        }
    }
    public static void space(int n){
        for(int i = 0; i < n; i++){
            System.out.println("----------------");
        }
    }
    public static void revPattern(int n){
        for(int i = 0; i < n; i++){
            for(int j = 0; j < n-i; j++){
                System.out.print(" ");
            }
            for(int j = 0; j < i; j++){
                System.out.print("*");
            }
            System.out.println();
        }
    }
    public static void pattern3(int n){
        for(int i = 1; i <= n; i++){
            for(int j = 1; j <= n - i + 1; j++){
                System.out.print(j + " ");
            }
            System.out.println();
        }
    }
    public static void floydPattern(int n){
        int dig = 1;
        for(int i = 1; i <= n; i++){
            for(int j = 1; j <= i; j++){
                System.out.print(dig + " ");
                dig++;
            }
            System.out.println();
        }
    }
    public static void pattern4(int n){
        for(int i = 1; i <= n; i++){
            for(int j = 1; j <= n-i; j++){
                System.out.print(" ");
            }
            for(int j = 1; j<= n; j++){
                System.out.print("*");
            }
            System.out.println();
        }
    }
    public static void pattern5(int n){
        for(int i = 1; i <= n; i++){
            for(int j = 1; j <= n; j++){
                if(i == 1 || i == n || j == 1 || j == n){
                    System.out.print("*" );
                }else{
                    System.out.print(" ");
                }
            }
            System.out.println();
        }
    }
    public static void pattern6(int n){
        for(int i = 1; i <= n; i++){
            for(int j = 1; j <= n - i; j++){
                System.out.print(" ");
            }
            for(int j = 1; j <= n; j++){
                if(i == 1 || i == n || j == 1 || j == n){
                    System.out.print("*");
                }else{
                    System.out.print(" ");
                }
            }
            System.out.println();
        }
    }
    public static void pattern7(int n){
        for(int i = 0; i < n; i++){
            for(int j = 0; j < n-i; j++){
                System.out.print(" ");
            }
            for(int j = 0; j < (2*i) + 1; j++){
                System.out.print("*");
            }
            System.out.println();
        }
        for(int i = n - 1; i >= 0; i--){
            for(int j = 0; j < n-i; j++){
                System.out.print(" ");
            }
            for(int j = 0; j < (2*i) + 1; j++){
                System.out.print("*");
            }
            System.out.println();
        }
    }
    public static void main(String[] args){
        Scanner sc = new Scanner(System.in);
        System.out.println("Enter Number");
        int n = sc.nextInt();

        pattern1(n);
        space(2);
        pattern2(n);
        space(2);
        revPattern(n);
        space(2);
        pattern3(n);
        space(2);
        floydPattern(n);
        space(2);
        pattern4(n);
        space(3);
        pattern5(n);
        space(2);
        pattern6(n);
        space(2);
        pattern7(n);
    }
}