Database System Concepts
Database System Concepts
7th Edition
ISBN: 9780078022159
Author: Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher: McGraw-Hill Education
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New JAVA code can only be added between lines 9 and 10, as seen in image.

**Instructions:**

Declare and initialize a reference variable for an `ArrayList` named `animalsList` that stores items of type `String`. Read integer `numAnimals` from input. Then, insert `numAnimals` "sheep" at the end of `animalsList`.

**Example:**
If the input is 3, then the output is:
```
sheep sheep sheep
```

**Code Explanation:**

```java
import java.util.Scanner;
import java.util.ArrayList;

public class MakeAnimalsList {
    public static void main(String[] args) {
        Scanner scnr = new Scanner(System.in);
        int numAnimals;
        int i;

        /* Variable declarations go here */

        /* Your code goes here */

        // Traversing a List using indexes
        for (i = 0; i < animalsList.size(); ++i) {
            System.out.print(animalsList.get(i) + " ");
        }
        System.out.println();
    }
}
```

**Key Components:**

1. **Imports:**
   - `java.util.Scanner`: Used for obtaining input from the user.
   - `java.util.ArrayList`: Provides the `ArrayList` class to create dynamic arrays.

2. **Main Class and Method:**
   - `MakeAnimalsList`: Class containing the main method.
   - `main(String[] args)`: The entry point for the program.

3. **Variables:**
   - `Scanner scnr`: For reading user input.
   - `int numAnimals`: Stores the number of animals.
   - `int i`: Loop counter.

4. **Comments:**
   - Placeholder comments indicate where the variable declarations and core logic should be placed.

5. **Loop:**
   - A `for` loop is used to traverse and print each element in `animalsList`.

This code snippet provides the structure, but the logic to read `numAnimals` and update `animalsList` is left for implementation. Fill in the necessary code under the indicated comment sections to complete the task.
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Transcribed Image Text:**Instructions:** Declare and initialize a reference variable for an `ArrayList` named `animalsList` that stores items of type `String`. Read integer `numAnimals` from input. Then, insert `numAnimals` "sheep" at the end of `animalsList`. **Example:** If the input is 3, then the output is: ``` sheep sheep sheep ``` **Code Explanation:** ```java import java.util.Scanner; import java.util.ArrayList; public class MakeAnimalsList { public static void main(String[] args) { Scanner scnr = new Scanner(System.in); int numAnimals; int i; /* Variable declarations go here */ /* Your code goes here */ // Traversing a List using indexes for (i = 0; i < animalsList.size(); ++i) { System.out.print(animalsList.get(i) + " "); } System.out.println(); } } ``` **Key Components:** 1. **Imports:** - `java.util.Scanner`: Used for obtaining input from the user. - `java.util.ArrayList`: Provides the `ArrayList` class to create dynamic arrays. 2. **Main Class and Method:** - `MakeAnimalsList`: Class containing the main method. - `main(String[] args)`: The entry point for the program. 3. **Variables:** - `Scanner scnr`: For reading user input. - `int numAnimals`: Stores the number of animals. - `int i`: Loop counter. 4. **Comments:** - Placeholder comments indicate where the variable declarations and core logic should be placed. 5. **Loop:** - A `for` loop is used to traverse and print each element in `animalsList`. This code snippet provides the structure, but the logic to read `numAnimals` and update `animalsList` is left for implementation. Fill in the necessary code under the indicated comment sections to complete the task.
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