Implementing Code in Java

Now that we have designed the low level structure of the payment app using various techniques such as defining the problem statement, creating the class diagram, establishing entity relationships, and designing the database schema, it's time to implement the actual code.

As a Java developer with good knowledge in Spring Boot, MySQL, and AWS, you are well-equipped to write the code for the payment app. Let's look at a simple example of how you can implement the payment app logic using the Java programming language.

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}

In the above code snippet, we have a main method which serves as the entry point of the program. Inside the main method, we have a loop that iterates from 1 to 100. For each iteration, we check if the current number is divisible by both 3 and 5, in which case we print "FizzBuzz". If it is only divisible by 3, we print "Fizz", and if it is only divisible by 5, we print "Buzz". For all other numbers, we simply print the number itself.

This is just a simple example to demonstrate implementing code in Java. In the actual payment app, you would need to write code for various functionalities such as handling user input, performing calculations, interacting with databases, and integrating with external systems.

As you continue learning low level design and implementing code in Java, you will gain more hands-on experience and become more proficient in building robust and efficient software systems.

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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);

      }

    }    

  }

}