Recall that within the ABList the numElements variable holds the number of elements currently in the list, and the elements array stores those elements. Assuming that a legal index is used, which of the following represents the code for the index-based T get(int index) method? O return elements[index]; O return index; OT value = elements[index]; return T; O return elements[index].getInfo(); O None of these is correct

Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
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### Implementing the Index-Based `get` Method in an Array-Based List

Within the `ABList`, the `numElements` variable holds the number of elements currently in the list, and the `elements` array stores those elements. Assuming that a legal index is used, we need to determine the code for the index-based `T get(int index)` method. Here are the options provided:

1. `return elements[index];`
2. `return index;`
3. `T value = elements[index]; return T;`
4. `return elements[index].getInfo();`
5. `None of these is correct`

#### Explanation of the Options:

- **Option 1: `return elements[index];`**
  This option directly returns the element at the specified index from the `elements` array. This can be a valid way to get an element from the list.

- **Option 2: `return index;`**
  This option simply returns the index itself, which does not fulfill the requirement of fetching the element from the list.

- **Option 3: `T value = elements[index]; return T;`**
  This option attempts to store the element at the specified index in a variable `value` of type `T`. However, it mistakenly returns `T` instead of returning the variable `value`.

- **Option 4: `return elements[index].getInfo();`**
  This option assumes that each element in the `elements` array has a method `getInfo()`. This might not be applicable in the general case unless `T` is a class that has the `getInfo()` method.

- **Option 5: `None of these is correct**
  This identifies that none of the above options are correct if we're following standard practices or specific requirements not mentioned here.

After evaluating the options, **Option 1** (`return elements[index];`) is the most plausible and correct code that represents the index-based `T get(int index)` method for an array-based list, provided the index is legal.
Transcribed Image Text:### Implementing the Index-Based `get` Method in an Array-Based List Within the `ABList`, the `numElements` variable holds the number of elements currently in the list, and the `elements` array stores those elements. Assuming that a legal index is used, we need to determine the code for the index-based `T get(int index)` method. Here are the options provided: 1. `return elements[index];` 2. `return index;` 3. `T value = elements[index]; return T;` 4. `return elements[index].getInfo();` 5. `None of these is correct` #### Explanation of the Options: - **Option 1: `return elements[index];`** This option directly returns the element at the specified index from the `elements` array. This can be a valid way to get an element from the list. - **Option 2: `return index;`** This option simply returns the index itself, which does not fulfill the requirement of fetching the element from the list. - **Option 3: `T value = elements[index]; return T;`** This option attempts to store the element at the specified index in a variable `value` of type `T`. However, it mistakenly returns `T` instead of returning the variable `value`. - **Option 4: `return elements[index].getInfo();`** This option assumes that each element in the `elements` array has a method `getInfo()`. This might not be applicable in the general case unless `T` is a class that has the `getInfo()` method. - **Option 5: `None of these is correct** This identifies that none of the above options are correct if we're following standard practices or specific requirements not mentioned here. After evaluating the options, **Option 1** (`return elements[index];`) is the most plausible and correct code that represents the index-based `T get(int index)` method for an array-based list, provided the index is legal.
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