Learn the basic concepts of Java such as loops, methods, and arrays.

Android Development with Java

This module will be our guide on getting started with Java. We'll start with a simple “Hello World” program and proceed to cover common concepts such as conditional statements, loops, math, and logic in Java. Then, we’ll move to more advanced concepts like inheritance, generics, and array lists, along with much more.
By the time we're done, we'll have enough knowledge to write simple Java programs.

Learn Java from Scratch

class HelloWorld {
    public static void main( String args[] ) {
        int rows = 5;
        for (int i = 1; i <= rows; ++i) {
            for (int j = 1; j <= i; ++j) {
                System.out.print("# ");
            }
            System.out.println();
        }
    }
}

## Explanation

Here is a breakdown of the above code for your thorough understanding.


- `for(int i = 1; i <= rows; ++i)` Outer for loop to iterate till the total number of rows. The outer for loop will terminate when the condition `i <= rows` is no longer true.

- `for(int j = 1; j <= i; ++j)`Inner for loop to print number of $hash$ characters in each row equal to the row number!

- `System.out.print("# ");` Prints each $hash$ character.

- `System.out.println();` Adds new line after every row.



# Explanation

Here is a breakdown of the above code for your thorough understanding.


- `for(int i = 1; i <= rows; ++i)` Outer for loop to iterate till the total number of rows. The outer for loop will terminate when the condition `i <= rows` is no longer true.

- `for(int j = 1; j <= i; ++j)`Inner for loop to print number of $hash$ characters in each row equal to the row number!

- `System.out.print("# ");` Prints each $hash$ character.

- `System.out.println();` Adds new line after every row.



In this review,  the solution of the challenge 'Pyramid Printing by Using 'for' Loop' from the previous lesson is provided.

Getting Started with Java!

Variables & User Input

Simple Maths & Logic

Strings and String Processing

Conditional Statements

Loops

Methods

Arrays

ArrayLists

Java Exam

Conclusion

Solution Review: Pyramid Printing by Using 'for' Loop

Solution #

Explanation