Add toString for debugging etc

git-svn-id: https://svn.apache.org/repos/asf/commons/proper/net/trunk@1753203 13f79535-47bb-0310-9956-ffa450edef68
diff --git a/src/main/java/org/apache/commons/net/pop3/POP3MessageInfo.java b/src/main/java/org/apache/commons/net/pop3/POP3MessageInfo.java
index 368338e..20aa8b4 100644
--- a/src/main/java/org/apache/commons/net/pop3/POP3MessageInfo.java
+++ b/src/main/java/org/apache/commons/net/pop3/POP3MessageInfo.java
@@ -83,4 +83,9 @@
         this.size = size;
         this.identifier = uid;
     }
+
+    @Override
+    public String toString() {
+        return "Number: " + number + ". Size: " + size + ". Id: " + identifier;
+    }
 }