
Database System Concepts
7th Edition
ISBN: 9780078022159
Author: Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher: McGraw-Hill Education
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Question
New JAVA Code can only be added between lines 24 and 26. All other lines can not be edited in any way. (As seen in Image).

Transcribed Image Text:```java
try {
coneWidth = scnr.nextInt();
if (coneWidth <= 0) {
throw new Exception("Cone's width (in cm) must be positive");
}
triesLeft = 0;
System.out.print("Valid input: ");
System.out.println("Cone's width (in cm) is " + coneWidth);
}
/* Your code goes here */
}
}
```
### Explanation
This Java code snippet demonstrates basic error checking for user input. It reads an integer value for `coneWidth` and ensures that it is positive. If the input is not positive, the program throws an exception with a message indicating that the cone's width must be positive. Upon receiving valid input, it prints a message confirming the cone's width.
- **Line 13-29**: The code is encapsulated in a try block to handle exceptions.
- **Line 14**: It reads an integer input from the user and assigns it to `coneWidth`.
- **Line 16-18**: It checks if `coneWidth` is less than or equal to zero, and if so, throws an exception with a descriptive message.
- **Line 20-22**: Once valid input is confirmed, it prints a validation message and the cone's width.
- **Line 25**: A comment indicates where additional code can be implemented.
This code is ideal for educational purposes, illustrating how to manage input validation and exception handling in Java.
![The while loop makes up to two attempts to read a positive integer from input into `coneWidth`. Use multiple exception handlers to:
- Catch an `InputMismatchException`, output "Unexpected input: The ConeWidth program quits", and assign `triesLeft` with 0.
- Catch an `Exception`, output the message of the Exception, and subtract 1 from `triesLeft`.
End each output with a newline.
**Example Outputs:**
1. **If the input is 23, then the output is:**
```
Tries left: 2
Valid input: Cone's width (in cm) is 23
```
2. **If the input is R, then the output is:**
```
Tries left: 2
Unexpected input: The ConeWidth program quits
```
3. **If the input is -28 23, then the output is:**
```
Tries left: 2
Cone's width (in cm) must be positive
Tries left: 1
Valid input: Cone's width (in cm) is 23
```
```java
1 import java.util.Scanner;
2 import java.util.InputMismatchException;
3
4 public class ConeWidth {
5 public static void main(String[] args) {
6 Scanner scnr = new Scanner(System.in);
7 int coneWidth;
8 int triesLeft = 2;
9
10 while (triesLeft > 0) {
11 System.out.println("Tries left: " + triesLeft);
12
13 try {
14 coneWidth = scnr.nextInt();
15
16 if (coneWidth <= 0) {
17 throw new Exception("Cone's width (in cm) must be positive");
18 }
```](https://content.bartleby.com/qna-images/question/0cc153ae-b205-4fb2-9991-7cf6a21d5016/14253146-b22c-47a0-98bb-7fe2661eb2ed/dow0z8s_thumbnail.png)
Transcribed Image Text:The while loop makes up to two attempts to read a positive integer from input into `coneWidth`. Use multiple exception handlers to:
- Catch an `InputMismatchException`, output "Unexpected input: The ConeWidth program quits", and assign `triesLeft` with 0.
- Catch an `Exception`, output the message of the Exception, and subtract 1 from `triesLeft`.
End each output with a newline.
**Example Outputs:**
1. **If the input is 23, then the output is:**
```
Tries left: 2
Valid input: Cone's width (in cm) is 23
```
2. **If the input is R, then the output is:**
```
Tries left: 2
Unexpected input: The ConeWidth program quits
```
3. **If the input is -28 23, then the output is:**
```
Tries left: 2
Cone's width (in cm) must be positive
Tries left: 1
Valid input: Cone's width (in cm) is 23
```
```java
1 import java.util.Scanner;
2 import java.util.InputMismatchException;
3
4 public class ConeWidth {
5 public static void main(String[] args) {
6 Scanner scnr = new Scanner(System.in);
7 int coneWidth;
8 int triesLeft = 2;
9
10 while (triesLeft > 0) {
11 System.out.println("Tries left: " + triesLeft);
12
13 try {
14 coneWidth = scnr.nextInt();
15
16 if (coneWidth <= 0) {
17 throw new Exception("Cone's width (in cm) must be positive");
18 }
```
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