Defining the Problem Statement

In the process of low level design, the first step is to define the problem statement. This involves identifying and documenting the requirements and objectives of the payment app design.

To better understand this step, let's consider an example problem statement for designing a payment app:

1  // Define the problem statement
2  String problemStatement = "Design a payment app that allows users to make secure online transactions.";
3
4  // Define the requirements
5  String[] requirements = {
6    "1. Users should be able to create an account and login.",
7    "2. Users should be able to add and manage multiple payment methods.",
8    "3. Users should be able to initiate and complete transactions.",
9    "4. Transactions should be secure and encrypted.",
10    "5. Users should receive notifications for successful transactions."
11  };
12
13  // Print the problem statement
14  System.out.println("Problem Statement:");
15  System.out.println(problemStatement);
16
17  // Print the requirements
18  System.out.println("Requirements:");
19  for (String requirement : requirements) {
20    System.out.println("- " + requirement);
21  }

In this example, we define the problem statement as designing a payment app that allows users to make secure online transactions. The requirements for this app include allowing users to create an account and login, add and manage multiple payment methods, initiate and complete transactions, ensure secure and encrypted transactions, and provide notifications for successful transactions.

Defining a clear problem statement and documenting the requirements is essential in the low level design process. It helps set the direction and goals for designing the payment app and ensures that all stakeholders have a clear understanding of what needs to be achieved.

Next, we will move on to creating the class diagram, which visualizes the relationships between different components in the payment app.

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class Main {

  public static void main(String[] args) {

    // replace with your Java logic here

    // Define the problem statement

    String problemStatement = "Design a payment app that allows users to make secure online transactions.";

​

    // Define the requirements

    String[] requirements = {

      "1. Users should be able to create an account and login.",

      "2. Users should be able to add and manage multiple payment methods.",

      "3. Users should be able to initiate and complete transactions.",

      "4. Transactions should be secure and encrypted.",

      "5. Users should receive notifications for successful transactions."

    };

​

    // Print the problem statement

    System.out.println("Problem Statement:");

    System.out.println(problemStatement);

​

    // Print the requirements

    System.out.println("Requirements:");

    for (String requirement : requirements) {

      System.out.println("- " + requirement);

    }

  }

}