dsa-in-java/Patterns.java at main · Mofiz-Usmani/dsa-in-java · GitHub

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public class Patterns {
    public static void hollow_rectangle(int totRows, int totCols){
        //outer loop
        for(int i=1; i<=totRows; i++){
            //inner - columns
            for(int j=1; j<=totCols; j++){
                //cell - (i,j)
                if(i == 1 || i == totRows || j == 1 || j == totCols){
                    // boundary cells
                    System.out.print("*");
                } else {
                    System.out.print(" ");
                }
            }
            System.out.println();
        }
    }


    public static void inverted_rectangle_half_pyramid(int n){
        //outer
        for(int i=1; i<=n; i++){
            //spaces
            for(int j=1; j<=n-i; j++){
                System.out.print(" ");
            }

            //stars
            for(int j=1; j<=i; j++){
                System.out.print("*");
            }

            System.out.println();
        }
    }


    public static void inverted_half_pyramid_withNumbers(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 floyds_traingle(int n) {
        //outer
        int counter = 1;
        for(int i=1; i<=n; i++){
            //inner
            for(int j=1; j<=i; j++){
                System.out.print(counter+ " ");
                counter++;
            }
            System.out.println();
        }
    }

    public static void zero_one_traingle(int n){
        for(int i=1; i<=n; i++){
            //inner
            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 butterfly(int n){
        //1st Half
        for(int i=1; i<=n; i++) {
            //stars - i
            for(int j=1; j<=i; j++){
                System.out.print("*");
            }

            //spaces - 2*(n-i)
            for(int j=1; j<=2*(n-i); j++){
                System.out.print(" ");
            }

            //stars - i
            for(int j=1; j<=i; j++){
                System.out.print("*");
            }
            System.out.println();
        }

        //2nd Half
        for(int i=n; i>=1; i--){
             //stars - i
            for(int j=1; j<=i; j++){
                System.out.print("*");
            }

            //spaces - 2*(n-i)
            for(int j=1; j<=2*(n-i); j++){
                System.out.print(" ");
            }

            //stars - i
            for(int j=1; j<=i; j++){
                System.out.print("*");
            }
            System.out.println();
        }
    }

    public static void solid_rhombus(int n ){
        //outer
        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 hollow_rhombus(int n) {
        for(int i=1; i<=n; i++){
            //spaces
            for(int j=1; j<=(n-i); j++){
                System.out.print(" ");
            }

            //hollow rectangle - stars
            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 diamond_pattern(int n){
        //outer
        for(int i=1; i<=n; i++) {
            //spaces
            for(int j=1; j<=(n-i); j++){
                System.out.print(" ");
            }

            //star
            for(int j=1; j<=(2*i)-1; j++){
                System.out.print("*");
            }
            System.out.println();
        }

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

            //star
            for(int j=1; j<=(2*i)-1; j++){
                System.out.print("*");
            }
            System.out.println();
        }
    }

    public static void main(String[] args) {
    // hollow_rectangle(4, 5); // Example: 5 rows and 10 columns
    // inverted_rectangle_half_pyramid(4);
    // inverted_half_pyramid_withNumbers(5);
    // floyds_traingle(5);
    // zero_one_traingle(5);
    // butterfly(5);
    // solid_rhombus(5);
    // hollow_rhombus(5);
    diamond_pattern(4);
    }
}