java runner class example

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certainly! in java, a "runner" class is typically a class that contains a `main` method and serves as the entry point for a java application. this class is responsible for executing the application logic, often instantiating other classes, invoking methods, and managing the flow of the program.

### step-by-step tutorial on creating a java runner class

1. **set up your development environment**
- ensure you have java development kit (jdk) installed on your machine. you can download it from [oracle's official site](https://www.oracle.com/java/technologies/javase-jdk11-downloads.html) or use openjdk.
- set up your favorite integrated development environment (ide) like intellij idea, eclipse, or even a simple text editor.

2. **create a java project**
- create a new directory for your project and navigate to it using the command line or terminal.
- create a new java file, e.g., `main.java`.

3. **write the runner class**
- the runner class will contain the `main` method, which is the entry point of any java application.

here’s an example of a simple java runner class that utilizes another class to perform some tasks:

### example code

#### step 1: create a class (`calculator.java`)
this class will contain methods to perform basic arithmetic operations.
#### step 2: create the runner class (`main.java`)
this class will be the entry point of the application and will create an instance of the `calculator` class to perform operations.
### step 3: compile and run the application

1. **open terminal or command prompt**.
2. navigate to the directory where your java files are located.
3. compile the classes using the java compiler:



4. run the application using the `java` command:



### expected output
when you run the `main` class, you should see the following output:
### explanation

- **calculator class**: this class has methods for addition, subtraction, multiplication, and division. the division method checks for division by zero and th ...

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