Received: from nobody by stodi.digitalkingdom.org with local (Exim 4.92) (envelope-from ) id 1i5Z25-0006q4-Th for lojban-newreal@lojban.org; Wed, 04 Sep 2019 10:25:25 -0700 Received: from specifically.expressproslafayette.com ([63.143.38.248]:37287) by stodi.digitalkingdom.org with esmtp (Exim 4.92) (envelope-from ) id 1i5Z23-0006p2-P0 for lojban@lojban.org; Wed, 04 Sep 2019 10:25:25 -0700 DKIM-Signature: v=1; a=rsa-sha1; c=relaxed/relaxed; s=8sjkarvd; d=expressproslafayette.com; h=Message-ID:Subject:Reply-To:From:To:MIME-Version:Content-Type:Date; i=lisa@expressproslafayette.com; bh=8vV2yMmpJDuCH4KFhAniAD7W4MI=; b=GHvQmfrtQhheznCKTkaBJEF8+ErexQ0i7nTZW0QiXAd2GdenB/1W2UzjHKq9LC3gXROjMNW6Q4nU Kmep9UOJ2T3WIGwt1pmivy529dNDxhzkcU8pDhHVivTz7xHp4/4HVRyK9adunQlNkWVuby53fRdY 0LIhUnYydGoOLBzkBTk= Message-ID: Subject: =?UTF-8?B?TGl2ZSBJbmRlcGVuZGVudGx5IHdpdGggT3RoZXIgT24tdGhlLUdvIFNlbmlvcnM=?= Reply-To: Lisa From: Lisa To: lojban@lojban.org MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="plpbhhxcrzoeex5q49ipo50o436juhvc5yko5v6vu94ujnbv" Date: Wed, 4 Sep 2019 13:23:13 -0400 X-Spam-Score: -0.4 (/) X-Spam_score: -0.4 X-Spam_score_int: -3 X-Spam_bar: / --plpbhhxcrzoeex5q49ipo50o436juhvc5yko5v6vu94ujnbv Content-type: text/plain; charset=UTF-8 Content-transfer-encoding: 7bit Lojban this is what it is. prime minister at the time cited the onerous requirements of the imf loan then on the table as a big reason for backing out of the eu deal. an imf deal, by the way, ended up being approved very shortly after the coup that unseated yanukovych. [obama in. http://www.expressproslafayette.com/00015expuC6wM88AbrV%2BYkF%2FNnYsggHJMCOrKut36LHo9H0tjY3yJeeV8Oa7rbU%2BwS8z0TJDMW%2BzYkUhsMPoW31jFKrBhA%3D%3Dres/mice/homes/viewing/40842136 http://b.expressproslafayette.com/. The first line declares a variable named num, but it does not actually contain a primitive value yet. Instead, it contains a pointer (because the type is Integer which is a reference type). Since you have not yet said what to point to, Java sets it to null, which means "I am pointing to nothing".In the second line, the new keyword is used to instantiate (or create) an object of type Integer and the pointer variable num is assigned to that Integer object.The NullPointerException occurs when you declare a variable but did not create an object. So you are pointing to something that does not actually exist.If you attempt to dereference num BEFORE creating the object you get a NullPointerException. In the most trivial cases, the compiler will catch the problem and let you know that "num may not have been initialized," but sometimes you may write code that does not directly create the object.For instance, you may have a method as follows: NullPointerExceptions are exceptions that occur when you try to use a reference that points to no location in memory (null) as though it were referencing an object. Calling a method on a null reference or trying to access a field of a null reference will trigger a NullPointerException. These are the most common, but other ways are listed on the NullPointerException javadoc page. --plpbhhxcrzoeex5q49ipo50o436juhvc5yko5v6vu94ujnbv Content-Type: text/html; charset="UTF-8" Content-transfer-encoding: 8bit

The first line declares a variable named num, but it does not actually contain a primitive value yet. Instead, it contains a pointer (because the type is Integer which is a reference type). Since you have not yet said what to point to, Java sets it to null, which means "I am pointing to nothing". In the second line, the new keyword is used to instantiate (or create) an object of type Integer and the pointer variable num is assigned to that Integer object. The NullPointerException occurs when you declare a variable but did not create an object. So you are pointing to something that does not actually exist. If you attempt to dereference num BEFORE creating the object you get a NullPointerException. In the most trivial cases, the compiler will catch the problem and let you know that "num may not have been initialized," but sometimes you may write code that does not directly create the object. For instance, you may have a method as follows:

NullPointerExceptions are exceptions that occur when you try to use a reference that points to no location in memory (null) as though it were referencing an object. Calling a method on a null reference or trying to access a field of a null reference will trigger a NullPointerException. These are the most common, but other ways are listed on the NullPointerException javadoc page.

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