+
−package goodjava.logging;
+
−
+
−
+
−public interface Logger {
+
−	public void error(String msg);
+
−	public void error(String msg,Throwable t);
+
−	public void warn(String msg);
+
−	public void warn(String msg,Throwable t);
+
−	public void info(String msg);
+
−	public void info(String msg,Throwable t);
+
−	public boolean isInfoEnabled();
+
−	public void debug(String msg);
+
−	public void debug(String msg,Throwable t);
+
−	public boolean isDebugEnabled();
+
−}