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Chapter 13: Problem 2

What is the index of the first item stored in a JList or a JComboBox component? If one of these components holds 12 items, what is the index of the 12 th item?

Short Answer

Expert verified
Answer: The index of the first item in a JList or JComboBox component is 0 (zero), and the index of the 12th item when the component holds 12 items in total is 11.

Step by step solution

01

Understanding JList and JComboBox indexing

In Java, both JList and JComboBox components follow zero-based indexing, which means that the index of the first item in these components is 0 (zero).
02

Finding the index of the first item

As mentioned earlier, the first item in a JList or JComboBox component has an index of 0.
03

Finding the index of the 12th item for a component with 12 items

Knowing that the indexing starts from 0, we can find the index of the 12th item by simply subtracting 1 from the total number of items: 12 - 1 = 11. Thus, the index of the 12th item is 11.

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