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...
Related questions
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)`](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F6cf78908-a1f9-4330-9ece-f4021df10613%2F0ed2db06-cbf1-49a2-b038-d5abcc012bd5%2Fj76opsb_processed.png&w=3840&q=75)
Transcribed Image Text:### 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)`
Expert Solution
This question has been solved!
Explore an expertly crafted, step-by-step solution for a thorough understanding of key concepts.
This is a popular solution!
Trending now
This is a popular solution!
Step by step
Solved in 2 steps
Recommended textbooks for you
Computer Networking: A Top-Down Approach (7th Edi…
Computer Engineering
ISBN:
9780133594140
Author:
James Kurose, Keith Ross
Publisher:
PEARSON
Computer Organization and Design MIPS Edition, Fi…
Computer Engineering
ISBN:
9780124077263
Author:
David A. Patterson, John L. Hennessy
Publisher:
Elsevier Science
Network+ Guide to Networks (MindTap Course List)
Computer Engineering
ISBN:
9781337569330
Author:
Jill West, Tamara Dean, Jean Andrews
Publisher:
Cengage Learning
Computer Networking: A Top-Down Approach (7th Edi…
Computer Engineering
ISBN:
9780133594140
Author:
James Kurose, Keith Ross
Publisher:
PEARSON
Computer Organization and Design MIPS Edition, Fi…
Computer Engineering
ISBN:
9780124077263
Author:
David A. Patterson, John L. Hennessy
Publisher:
Elsevier Science
Network+ Guide to Networks (MindTap Course List)
Computer Engineering
ISBN:
9781337569330
Author:
Jill West, Tamara Dean, Jean Andrews
Publisher:
Cengage Learning
Concepts of Database Management
Computer Engineering
ISBN:
9781337093422
Author:
Joy L. Starks, Philip J. Pratt, Mary Z. Last
Publisher:
Cengage Learning
Prelude to Programming
Computer Engineering
ISBN:
9780133750423
Author:
VENIT, Stewart
Publisher:
Pearson Education
Sc Business Data Communications and Networking, T…
Computer Engineering
ISBN:
9781119368830
Author:
FITZGERALD
Publisher:
WILEY