Coding in Java

In this section, we will dive into implementing the payment app using the Java programming language. Java is a popular choice for building enterprise-level applications due to its strong ecosystem, extensive libraries, and scalability.

To start, let's look at an example of a simple Java program that prints numbers from 1 to 100. This program demonstrates the basic syntax and control flow of Java:

1class Main {
2  public static void main(String[] args) {
3    // replace with your Java logic here
4    for(int i = 1; i <= 100; i++) {
5      if(i % 3 == 0 && i % 5 == 0) {
6          System.out.println("FizzBuzz");
7      } else if(i % 3 == 0) {
8          System.out.println("Fizz");
9      } else if(i % 5 == 0) {
10          System.out.println("Buzz");
11      } else {
12          System.out.println(i);
13      }
14    }
15  }
16}

This program uses a for loop to iterate from 1 to 100 and checks if each number is divisible by 3, 5, or both. Based on the conditions, it prints out either "Fizz", "Buzz", "FizzBuzz", or the number itself.

As you can see, Java provides a clear and concise syntax for expressing logic. You can leverage this simplicity to implement the various components of the payment app, such as handling payment methods, managing user accounts, and processing transactions.

In the upcoming lessons, we will explore specific concepts related to low-level design in Java and apply them to build the payment app. Stay tuned!

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class Main {

  public static void main(String[] args) {

    // replace with your Java logic here

    for(int i = 1; i <= 100; i++) {

      if(i % 3 == 0 && i % 5 == 0) {

          System.out.println("FizzBuzz");

      } else if(i % 3 == 0) {

          System.out.println("Fizz");

      } else if(i % 5 == 0) {

          System.out.println("Buzz");

      } else {

          System.out.println(i);

      }

    }

  }

}