ILogger

public interface ILogger

 public class MyCustomLogger implements ILogger {
     public void debug(String message) {
         System.out.println("[DBG] " + message);
     }
     public void info(String message) {
         System.out.println("[INF] " + message);
     }
     public void warn(String message) {
         System.out.println("[WRN] " + message);
     }
     public void error(String message) {
         System.out.println("[ERR] " + message);
     }
 }
 

void debug(String message)

void info(String message)

void warn(String message)

void error(String message)