Here is an example of how you might use the ProxyReader class from the org.apache.commons.io package in Java:

import java.io.Reader;
import org.apache.commons.io.input.ProxyReader;

public class MyClass {

    public void doSomethingWithReader(Reader reader) {
        // Wrap the reader in a ProxyReader
        Reader proxyReader = new ProxyReader(reader);
        
        // Use the proxy reader just like you would use the original reader
        int data = proxyReader.read();
        while (data != -1) {
            // Do something with the data
            data = proxyReader.read();
        }
    }
}

The ProxyReader class is a simple wrapper for an existing Reader that can be subclassed to provide additional functionality. In this example, the doSomethingWithReader method takes a Reader as a parameter, wraps it in a ProxyReader, and then uses it to read data.

You can also subclass ProxyReader to provide additional functionality, such as logging or adding a progress bar to the reader.

Note that you can also use read(char[] cbuf, int off, int len) method to read a specific number of characters at a time.