How to develop a simple calculator application using Java

How to use Java to develop a simple calculator application

Overview:
The calculator is one of the commonly used tools in our daily life. In computer programming, developing a simple calculator application is a good practice project. This article will introduce how to use the Java programming language to develop a simple console-based calculator application and provide specific code examples.

Step 1: Create a Java class
First, we need to create a Java class to carry the function of the calculator. Create a new Java class in your IDE and give the class a suitable name, such as Calculator. This class will contain the calculator logic and user interface interactions.

Step 2: Add the necessary import statements
In order to use the mathematical calculation functions and console input/output functions in Java, we need to add the necessary import statements at the beginning of the code. Add the following import statement to your code:

import java.util.Scanner;
import java.lang.Math;

Step 3: Write the calculator logic
Next, we will write the logic of the calculator. We will use a loop to continue receiving user input and calculating results until the user opts out.

Here is a simple sample code:

public class Calculator {
    public static void main(String[] args) {
        boolean exit = false;
        Scanner scanner = new Scanner(System.in);

        while (!exit) {
            System.out.print("请输入第一个数字：");
            double num1 = scanner.nextDouble();

            System.out.print("请输入操作符(+, -, *, /)：");
            String operator = scanner.next();

            System.out.print("请输入第二个数字：");
            double num2 = scanner.nextDouble();

            double result = 0.0;

            switch (operator) {
                case "+":
                    result = num1 + num2;
                    break;
                case "-":
                    result = num1 - num2;
                    break;
                case "*":
                    result = num1 * num2;
                    break;
                case "/":
                    result = num1 / num2;
                    break;
                default:
                    System.out.println("输入错误，请重新输入。");
                    continue;
            }

            System.out.println("结果：" + result);

            System.out.print("是否继续计算？(Y/N)：");
            String choice = scanner.next();

            if (choice.equalsIgnoreCase("N")) {
                exit = true;
            }
        }

        scanner.close();
    }
}

Step Four: Run and Test
When the above code has been completed, you can run your calculator application and test it Function. You enter two numbers and an operator, and the calculator outputs the result. You can also choose whether to continue the calculation.

Summary:
Through the above steps, we have successfully developed a simple calculator application. But this is just a basic framework. You can further extend and improve the application according to your needs and interests. For example, you can add more operators, add some advanced features, or change the interface to better meet the needs of your users.

I hope this article can help you understand how to use Java to develop a simple calculator application. Happy coding!

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