Here is an example of how you can use the ContextSelectorStaticBinder class from the logback.classic package:

import ch.qos.logback.classic.LoggerContext;
import ch.qos.logback.classic.selector.ContextSelector;
import ch.qos.logback.classic.util.ContextSelectorStaticBinder;

public class MyClass {
  public static void main(String[] args) {
    // Get the logger context
    LoggerContext context = (LoggerContext) LoggerFactory.getILoggerFactory();

    // Set the logger context as the default context
    ContextSelector selector = ContextSelectorStaticBinder.getSingleton().getContextSelector();
    selector.setDefaultLoggerContext(context);

    // Get the default logger context
    LoggerContext defaultContext = selector.getDefaultLoggerContext();
  }
}

The ContextSelectorStaticBinder class is used to bind a ContextSelector instance to the LoggerFactory. The ContextSelector is responsible for selecting the appropriate LoggerContext for a given logger name.

In this example, we use the ContextSelectorStaticBinder to get the singleton instance of the ContextSelector, and then use the setDefaultLoggerContext method to set the default LoggerContext. We can then use the getDefaultLoggerContext method to retrieve the default LoggerContext.