Here is an example of how to use the Separators class from the org.apache.commons.io package in Java:

import org.apache.commons.io.output.Separators;
import org.apache.commons.io.output.StringBuilderWriter;

public class Main {
    public static void main(String[] args) {
        // Create a StringBuilderWriter object
        StringBuilderWriter writer = new StringBuilderWriter();

        // Create a Separators object with comma as the separator
        Separators separators = new Separators(',');

        // Write some text to the writer, separated by commas
        separators.write(writer, "Hello", "World", "!");

        // Get the resulting text
        String result = writer.toString();
        System.out.println(result);
    }
}

In this example, we create a StringBuilderWriter object and a Separators object that uses a comma as the separator. We then use the write() method of the Separators class to write the text "Hello", "World", "!" to the StringBuilderWriter, with commas as separators. The resulting text is "Hello, World, !".

It's worth noting that this class was removed from the apache.commons.io library in version 2.6 and later versions, you can use other libraries like StringJoiner and StringBuilder to achieve similar functionality.