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Document that when the field is either not existent, or not a number, it throws an NullPointer exception
BasicDBObject dbo = new BasicDBObject();
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System.out.println(dbo.get("A")); // => null
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System.out.println(dbo.getString("A")); // => null
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System.out.println(dbo.getDate("A")); // => null
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System.out.println(dbo.getLong("A")); // => throws NullPointer
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System.out.println(dbo.getInt("A")); // => throws NullPointer
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links:
http://api.mongodb.org/java/2.0/org/bson/BasicBSONObject.html#getLong(java.lang.String)
http://api.mongodb.org/java/2.0/org/bson/BasicBSONObject.html#getInt(java.lang.String)
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