4. Say we wanted to get an iterator for an ArrayList and use it to loop over all items and print them to the console. What would the code look like for this?
4. Say we wanted to get an iterator for an ArrayList and use it to loop over all items and print them to the console. What would the code look like for this?
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
Section: Chapter Questions
Problem 1PE
Related questions
Question
![### Educational Content on ArrayList in Java
#### Question 4:
Say we wanted to get an iterator for an ArrayList and use it to loop over all items and print them to the console. What would the code look like for this?
**Example Code:**
```java
ArrayList<String> list = new ArrayList<String>();
list.add("Item 1");
list.add("Item 2");
list.add("Item 3");
Iterator<String> iterator = list.iterator();
while(iterator.hasNext()) {
System.out.println(iterator.next());
}
```
#### Question 5:
Write a method signature for a method called `foo` that takes an array as an argument. The return type is `void`.
**Method Signature:**
```java
void foo(int[] array);
```
#### Question 6:
What is the difference between `remove` and `clear` in ArrayLists?
**Explanation:**
- `remove`: This method deletes a single element from the ArrayList. You can remove an element by its index or by specifying the element itself if it exists.
**Example:**
```java
list.remove(0); // Removes the element at index 0
list.remove("Item 1"); // Removes the specified element
```
- `clear`: This method removes all elements from the ArrayList, effectively emptying the list.
**Example:**
```java
list.clear(); // All elements are removed, and the list is now empty
```](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F4f2e78f4-02a6-4843-ac83-b4141c1bc59d%2Fba7a6dc9-8806-420e-8102-a7ee34338c07%2Fcnpyhnu_processed.jpeg&w=3840&q=75)
Transcribed Image Text:### Educational Content on ArrayList in Java
#### Question 4:
Say we wanted to get an iterator for an ArrayList and use it to loop over all items and print them to the console. What would the code look like for this?
**Example Code:**
```java
ArrayList<String> list = new ArrayList<String>();
list.add("Item 1");
list.add("Item 2");
list.add("Item 3");
Iterator<String> iterator = list.iterator();
while(iterator.hasNext()) {
System.out.println(iterator.next());
}
```
#### Question 5:
Write a method signature for a method called `foo` that takes an array as an argument. The return type is `void`.
**Method Signature:**
```java
void foo(int[] array);
```
#### Question 6:
What is the difference between `remove` and `clear` in ArrayLists?
**Explanation:**
- `remove`: This method deletes a single element from the ArrayList. You can remove an element by its index or by specifying the element itself if it exists.
**Example:**
```java
list.remove(0); // Removes the element at index 0
list.remove("Item 1"); // Removes the specified element
```
- `clear`: This method removes all elements from the ArrayList, effectively emptying the list.
**Example:**
```java
list.clear(); // All elements are removed, and the list is now empty
```
Expert Solution
Step 1
The iterator can be used to iterate through the ArrayList.
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