LogUtils.java

import androidx.annotation.NonNull;
import androidx.annotation.Nullable;

public class LogUtils {

    @NonNull public static String objPrefix(@Nullable Object obj) {
        if (obj != null) {
            return String.format(
                    "[%s@%s]",
                    obj.getClass().getSimpleName(),
                    Integer.toHexString(obj.hashCode())
            );
        }
        return "[null@instance]";
    }

    @NonNull public static String objMessage(@Nullable Object obj, @NonNull String message) {
        return String.format("%s: %s", objPrefix(obj), message);
    }

}