Lecture 7

Question 1

What are containers (In java)?

Answer 1

Containers are groups of data, much like arrays.

Question 2

What is the difference between arrays and containers?

Answer 2

Containers have a flexible size, arrays do not.

Question 3

What are the biggest pros and cons of containers compared to arrays?

Answer 3

pro: more flexible
con: less efficient

Question 4

What is the order of an algorithm?

Answer 4

The order of an algorithm is a measure of the algorithm’s execution time. Determined by the order of the number of steps it takes, e.g. O(1), O(n), O(n^2).

Question 5

What differentiates a set from a list?

Answer 5

In a set, there is no specific order and there cannot be duplicate elements. In a list, there is a specific order and there can be duplicate elements.

Question 6

What happens if you add 23 to an ArrayList, how is this called and why?

Answer 6

It will be stored but as an object of the class Integer. This is called auto-boxing and the reason for this is that an ArrayList can only contain elements that are of a reference data type.

Question 7

How can you specify the class of objects in an ArrayList?

Answer 7

ArrayList someArray = new ArrayList(); AND BRACKETY THINGIES! <>