Computer Networking: A Top-Down Approach (7th Edition)
7th Edition
ISBN: 9780133594140
Author: James Kurose, Keith Ross
Publisher: PEARSON
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4. Now examine the ArrayList methods in the above table,
a) Which method retrieves elements from the ArrayList?
b) Which method replaces the value of an element that already exists in the ArrayList?
c) Which two methods initializes the value of an element?
d) How do the two methods in (c) differ? Which method(s) would be appropriate in the above Java program (after we convert it to work with ArrayLists)?
![## Accessing and Modifying Array Elements in Java
Here is a quick review of how array elements are modified and accessed:
```java
public class BasicArray {
public static void main(String[] args) {
int[] basic = new int[4];
for (int i = 0; i < basic.length; i++) {
basic[i] = i + 1;
}
for (int i = 0; i < basic.length; i++) {
basic[i] = basic[i] * 5;
}
for (int i = 0; i < basic.length; i++) {
System.out.println(basic[i]);
}
}
}
```
### Explanation:
- **Lines 3-4:** An integer array `basic` of size 4 is declared.
- **Lines 5-6:** A for-loop initializes the array elements to `i + 1`. For example, the array will be populated as `[1, 2, 3, 4]`.
- **Lines 7-8:** Another for-loop modifies each element by multiplying it by 5. The array becomes `[5, 10, 15, 20]`.
- **Lines 10-12:** Finally, a for-loop prints each element of the array.
---
Because `ArrayList` is a Java class, we need `set` and `get` methods to modify the ArrayList. The `E` type refers to the base type of the `ArrayList`:
| Method (Parameters) | Return Value Type | Description |
|----------------------------|-------------------|-----------------------------------------------------------------------------|
| `add(E element)` | `boolean` | Appends the specified element to the end of this list. |
| `add(int index, E element)`| `void` | Inserts the specified element at the specified position in this list. |
| `get(int index)` | `E` | Returns the element at the specified position in this list. |
| `set(int index, E element)`| `E` | Replaces the element at the specified position in this list with the specified element. Returns the element previously at the specified position. |
| `size()` | `int` | Returns the number of elements in this list. |](https://content.bartleby.com/qna-images/question/6cf78908-a1f9-4330-9ece-f4021df10613/cd099ace-86c8-43b3-89ca-e958e52d867c/ka3nscr_processed.png)
Transcribed Image Text:## Accessing and Modifying Array Elements in Java
Here is a quick review of how array elements are modified and accessed:
```java
public class BasicArray {
public static void main(String[] args) {
int[] basic = new int[4];
for (int i = 0; i < basic.length; i++) {
basic[i] = i + 1;
}
for (int i = 0; i < basic.length; i++) {
basic[i] = basic[i] * 5;
}
for (int i = 0; i < basic.length; i++) {
System.out.println(basic[i]);
}
}
}
```
### Explanation:
- **Lines 3-4:** An integer array `basic` of size 4 is declared.
- **Lines 5-6:** A for-loop initializes the array elements to `i + 1`. For example, the array will be populated as `[1, 2, 3, 4]`.
- **Lines 7-8:** Another for-loop modifies each element by multiplying it by 5. The array becomes `[5, 10, 15, 20]`.
- **Lines 10-12:** Finally, a for-loop prints each element of the array.
---
Because `ArrayList` is a Java class, we need `set` and `get` methods to modify the ArrayList. The `E` type refers to the base type of the `ArrayList`:
| Method (Parameters) | Return Value Type | Description |
|----------------------------|-------------------|-----------------------------------------------------------------------------|
| `add(E element)` | `boolean` | Appends the specified element to the end of this list. |
| `add(int index, E element)`| `void` | Inserts the specified element at the specified position in this list. |
| `get(int index)` | `E` | Returns the element at the specified position in this list. |
| `set(int index, E element)`| `E` | Replaces the element at the specified position in this list with the specified element. Returns the element previously at the specified position. |
| `size()` | `int` | Returns the number of elements in this list. |
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