Java Intermediate: 6/17/2021

Main.java

//Replace the package with whatever it says in your Intellij New project
//package com.javafx.test;

import java.util.Scanner;

public class Main {

    public static void main(String[] args) {
        reverseString();
        arrExample();
        asteriskPyramid();
        rectangle();
        pyramid();
        nestLoop();
        fourfigurea();
        fourfigureb();
        fourfigurec();
        fourfigured();
    }
    public static void reverseString(){
        Scanner scanner = new Scanner(System.in);
        System.out.print("Input a string: ");
        char[] letters = scanner.nextLine().toCharArray();
        System.out.print("Reverse string: ");
        for (int i = letters.length - 1; i >= 0; i--) {
            System.out.print(letters[i]);
        }
        System.out.print("\n");
    }
    public static void arrExample(){
        String[][] arr = {{"Victor", "Peter", "Doug"}, {"Tall", "Short", "Tall"}};
        for (int i = 0; i< arr.length; i++){
            for(int v = 0; v < arr[i].length; v++){
                System.out.print(arr[i][v]+" ");
            }
            System.out.println();
        }
    }
    public static void asteriskPyramid(){
        String[][] array = new String[3][3];
        String asterisks = "*";
        int numberOfAsterisks = 0;

        // iterate through the 3x3 array
        for (int row = 0; row < 3; row++) {
            for (int col = 0; col < 3; col++) {
                // store the asterisk(s) in the array
                array[row][col] = asterisks;

                // print the current element
                System.out.print(array[row][col] + "\t");

                // update total number of asterisks in array
                numberOfAsterisks += row + 1;
            }
            System.out.println(); // move to next row
            asterisks += "*"; // each row has 1 more asterisk than the last one
        }

        // print the total number of asterisks in the array
        System.out.println("Number of asterisks: " + numberOfAsterisks);
    }
    public static void rectangle(){
        for (int row = 1; row <= 10; row++)
        {
            for (int col = 1; col <= 8; col++)
            {
                System.out.print("*");
            }
            System.out.println();
        }
    }
    public static void pyramid(){
        Scanner scanner = new Scanner(System.in);
        System.out.println("Enter the # of lines");
        int n = scanner.nextInt();

        for(int i=1;i<=n;i++)
        {
            for(int j=i;j<=n;j++)
            {
                System.out.print(" ");
            }
            for(int j=1;j<=i;j++)
            {
                System.out.print("* ");
            }
            System.out.println("");
        }
    }
    public static void nestLoop(){
        for (int line = 1; line <= 5; line++) {
            for (int j = 1; j <= (-1 * line + 5); j++) {
                System.out.print(".");
            }
            System.out.print(line);
            for (int j = 1; j <= (line - 1); j++) {
                System.out.print(".");
            }
            System.out.println();
        }
    }
    public static void fourfigurea(){
        for (int count =0; count < 10; count++)
        {
            for (int j=0; j < count+1; j++)
            System.out.print("*");
            System.out.println();
        }
    }
    public static void fourfigureb(){
        for (int count =11; count >= 0; count--)
        {
            for (int j=0; j < count-1; j++)
            System.out.print("*");
            System.out.println();
        }
    }
    public static void fourfigurec(){
        for(int count = 0; count < 10; count++)
        {
            for(int index=1; index < count+1; index++)
            System.out.print(" ");
            for(int star=10; star > count; star--)
            System.out.print("*");
            System.out.println();
        }
    }
    public static void fourfigured(){
        for(int count = 10; count > 0; count--)
        {
            for(int index=0; index < count-1; index++)
            System.out.print(" ");
            for(int star=10; star > count-1; star--)
            System.out.print("*");
            System.out.println();
        }
    }
}