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ArrayList of a List of Integers - Sun Certified Java Programmer 310-065 - part 34 | Java courses

In this video we will specifically talk about HashSet and TreeSet, a group of ArrayList of a List of Integers.

Duration: 16:26 minutes

Summary: In this video, we start discussing the exam questions related to the Generics and Collections. Most of the questions have to do with adding a generic declaration to the code and seeing which of the options will work best and not generate an error. We start with an ArrayList of a List of Integers so we can insert a row into a table. Then we moved into the relationship between hashCode and equals. We also tackled inserting items into a TreeSet and how that can throw exceptions during runtime when the objects are of different types since the TreeSet needs to compare them and sort them. Finally, we explained the difference of the results of adding elements into a map when the equals method is implemented and the hashCode is commented out.



Senior Software Engineer with experience in C#, JavaScript, jQuery, Knockout JS, Kendo UI, HTML5, and SQL Server. Ayad has more than 20 years experience in technical training and teaching. Contributor to MrBool for about 7 years.

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