### Java For-Loops and ArrayListsLet's examine the for-loops in the given Java program and discuss how to handle them when working with an `ArrayList`.**Java Program:**```javapublic 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]); } }}```#### Questions:**a) Which ArrayList method should you use to control the for-loop iterations?**To control the iterations of a for-loop when using an `ArrayList`, you should use the `size()` method. This method returns the number of elements in the `ArrayList`, which you can then use as the loop's endpoint.**Example:**```javaArrayList arrayList = new ArrayList<>();for (int i = 0; i < arrayList.size(); i++) { // Loop body}```**b) Explain why the first for-loop cannot be controlled by that ArrayList method (but the other two for-loops can).**The first for-loop cannot be controlled by the `size()` method because it initializes the array and assigns values to its elements. When you replace the array with an `ArrayList`, you must use the `add` method to add elements to the `ArrayList`. The size of the `ArrayList` would be zero initially, and using the `size()` method in the first loop would result in no iterations.**Example Modification:**- Replace `int[] basic = new int[4];` with `ArrayList basic = new ArrayList<>();`.- Use the `add` method to add elements in the first loop.```javafor (int i = 0; i < 4; i++) { basic.add(i + 1);}```**Quick Review of Array Access and Modification in Java:**| Method (Parameters) | Return Value Type | Description ||--------------------------------|-------------------|---------------------------------------------------------------|| `add(E element)`

Since, Array is replaced with ArrayList initially ArrayList object is created empty list, with…

5. Now examine the for-loops in the above Java program. (assume that we have the have replaced the array with an Array a) Which ArrayList method should you use to control the for-loop iterations? b) Explain why the first for-loop cannot be controlled by that ArrayList method (but the other two for-loops can). Here is a quick review of how array elements are modified and accessed: 1. public class BasicArray{ 2. public static void main(String[] args) 3. int] basic new int [4]; 4. for (int i=0; i

5. Now examine the for-loops in the above Java program. (assume that we have the have replaced the array with an Array a) Which ArrayList method should you use to control the for-loop iterations? b) Explain why the first for-loop cannot be controlled by that ArrayList method (but the other two for-loops can). Here is a quick review of how array elements are modified and accessed: 1. public class BasicArray{ 2. public static void main(String[] args) 3. int] basic new int [4]; 4. for (int i=0; i

Computer Networking: A Top-Down Approach (7th Edition)

7th Edition

ISBN:9780133594140

Author:James Kurose, Keith Ross

Publisher:James Kurose, Keith Ross

Chapter1: Computer Networks And The Internet

Section: Chapter Questions

Problem R1RQ: What is the difference between a host and an end system? List several different types of end...

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Question

### Java For-Loops and ArrayLists

Let's examine the for-loops in the given Java program and discuss how to handle them when working with an `ArrayList`.

**Java Program:**

```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]);
}
}
}
```

#### Questions:

**a) Which ArrayList method should you use to control the for-loop iterations?**

To control the iterations of a for-loop when using an `ArrayList`, you should use the `size()` method. This method returns the number of elements in the `ArrayList`, which you can then use as the loop's endpoint.

**Example:**
```java
ArrayList<Integer> arrayList = new ArrayList<>();
for (int i = 0; i < arrayList.size(); i++) {
// Loop body
}
```

**b) Explain why the first for-loop cannot be controlled by that ArrayList method (but the other two for-loops can).**

The first for-loop cannot be controlled by the `size()` method because it initializes the array and assigns values to its elements. When you replace the array with an `ArrayList`, you must use the `add` method to add elements to the `ArrayList`. The size of the `ArrayList` would be zero initially, and using the `size()` method in the first loop would result in no iterations.

**Example Modification:**
- Replace `int[] basic = new int[4];` with `ArrayList<Integer> basic = new ArrayList<>();`.
- Use the `add` method to add elements in the first loop.

```java
for (int i = 0; i < 4; i++) {
basic.add(i + 1);
}
```

**Quick Review of Array Access and Modification in Java:**

| Method (Parameters) | Return Value Type | Description |
|--------------------------------|-------------------|---------------------------------------------------------------|
| `add(E element)`

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