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

import org.apache.commons.io.output.TextBuffer;

public class Main {
    public static void main(String[] args) {
        // Create a TextBuffer object
        TextBuffer buffer = new TextBuffer();
        
        // Append some text to the buffer
        buffer.append("Hello");
        buffer.append(" ");
        buffer.append("World");
        buffer.append("!");

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

In this example, we create a TextBuffer object and use the append() method to append text to the buffer. We append "Hello", " ", "World" and "!" to the buffer and get the resulting text using the toString() method. 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 classes like StringBuilder and StringBuffer for similar functionality.