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String cashewFileName is read from input. The try block opens a file named cashewFileName to read an integer into dataVal 1. Write an exception handler to catch a FileNotFoundException and assign hasErr with true. 2. After the catch block, close cashewScanner if cashewScanner is open. Ex: If the input is cashew2.txt, then the output is: Value read from cashew2.txt: 21 Ex: If the input is nothing.txt, then the output is: nothing.txt: File not found 1 import java.util.Scanner; 2 import java.io.FileNotFoundException; 3 // This program uses an overloaded FileInputStream Library to check for file closure 4 5 public class ReadInputFile { 6 7 8 9 10 11 12 13 14 15 4005 16 17 ReadinputFile.java public static void main(String[] args) { Scanner scnr = new Scanner(System.in); FileInputStream cashewInStream; Scanner cashewScanner = null; String cashewFileName; int dataValue = -1; boolean hasErr = false; cashewFileName try { cashew1.txt cashew2.txt cashew3.txt = scnr.next(); cashewInStream = new FileInputStream(cashewFileName);

String cashewFileName is read from input. The try block opens a file named cashewFileName to read an integer into dataVal 1. Write an exception handler to catch a FileNotFoundException and assign hasErr with true. 2. After the catch block, close cashewScanner if cashewScanner is open. Ex: If the input is cashew2.txt, then the output is: Value read from cashew2.txt: 21 Ex: If the input is nothing.txt, then the output is: nothing.txt: File not found 1 import java.util.Scanner; 2 import java.io.FileNotFoundException; 3 // This program uses an overloaded FileInputStream Library to check for file closure 4 5 public class ReadInputFile { 6 7 8 9 10 11 12 13 14 15 4005 16 17 ReadinputFile.java public static void main(String[] args) { Scanner scnr = new Scanner(System.in); FileInputStream cashewInStream; Scanner cashewScanner = null; String cashewFileName; int dataValue = -1; boolean hasErr = false; cashewFileName try { cashew1.txt cashew2.txt cashew3.txt = scnr.next(); cashewInStream = new FileInputStream(cashewFileName);

Database System Concepts
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
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ONLY ReadInputFile.java file can be edited with New JAVA CODE

ONLY new code can be added between 21 and 23 (as seen in image).

 

cashew1.txt

47

 

cashew2.txt

21

 

cashew3.txt

25

### Reading from a File in Java This example demonstrates how to read an integer from a file using Java, and how to properly handle exceptions such as `FileNotFoundException`. #### Key Steps 1. **Reading the File Name:** - The file name `cashewFileName` is read from user input. 2. **Exception Handling:** - Implement an exception handler to catch `FileNotFoundException` and set `hasErr` to true when an error occurs. - Ensure the file scanner (`cashewScanner`) is closed after reading. #### Examples - **Successful Reading:** - Input: `cashew2.txt` - Output: `Value read from cashew2.txt: 21` - **File Not Found:** - Input: `nothing.txt` - Output: `nothing.txt: File not found` #### Java Code Explanation Below is the Java code used to achieve the above functionality: ```java import java.util.Scanner; import java.io.FileNotFoundException; // This program uses an overLoaded FileInputStream Library to check for file closure public class ReadInputFile { public static void main(String[] args) { Scanner scnr = new Scanner(System.in); FileInputStream cashewInStream; Scanner cashewScanner = null; String cashewFileName; int dataValue = -1; boolean hasErr = false; cashewFileName = scnr.next(); try { cashewInStream = new FileInputStream(cashewFileName); ``` #### Diagram Overview The accompanying code provides the functionality to: - Take a file name input from the user. - Attempt to read from the specified file. - Handle errors gracefully, ensuring that resources are managed appropriately, such as closing the file scanner, if opened. The tabs below the code section suggest files (`cashew1.txt`, `cashew2.txt`, etc.) that might contain integer data to be read by the program.
Transcribed Image Text:### Reading from a File in Java This example demonstrates how to read an integer from a file using Java, and how to properly handle exceptions such as `FileNotFoundException`. #### Key Steps 1. **Reading the File Name:** - The file name `cashewFileName` is read from user input. 2. **Exception Handling:** - Implement an exception handler to catch `FileNotFoundException` and set `hasErr` to true when an error occurs. - Ensure the file scanner (`cashewScanner`) is closed after reading. #### Examples - **Successful Reading:** - Input: `cashew2.txt` - Output: `Value read from cashew2.txt: 21` - **File Not Found:** - Input: `nothing.txt` - Output: `nothing.txt: File not found` #### Java Code Explanation Below is the Java code used to achieve the above functionality: ```java import java.util.Scanner; import java.io.FileNotFoundException; // This program uses an overLoaded FileInputStream Library to check for file closure public class ReadInputFile { public static void main(String[] args) { Scanner scnr = new Scanner(System.in); FileInputStream cashewInStream; Scanner cashewScanner = null; String cashewFileName; int dataValue = -1; boolean hasErr = false; cashewFileName = scnr.next(); try { cashewInStream = new FileInputStream(cashewFileName); ``` #### Diagram Overview The accompanying code provides the functionality to: - Take a file name input from the user. - Attempt to read from the specified file. - Handle errors gracefully, ensuring that resources are managed appropriately, such as closing the file scanner, if opened. The tabs below the code section suggest files (`cashew1.txt`, `cashew2.txt`, etc.) that might contain integer data to be read by the program.
This image displays a code editor with a Java program named `ReadInputFile.java`. The editor also shows three text files: `cashew1.txt`, `cashew2.txt`, and `cashew3.txt`. Below is the transcribed code content visible in the image: ```java 15 try { 16 cashewInStream = new FileInputStream(cashewFileName); 17 cashewScanner = new Scanner(cashewInStream); 18 dataValue = cashewScanner.nextInt(); 19 } 20 /* Your code goes here */ 21 22 if (hasErr) { 23 System.out.println(cashewFileName + ": File not found"); 24 } 25 else { 26 System.out.println("Value read from " + cashewFileName + ": " + dataValue); 27 } 28 } 29 } ``` ### Explanation of Code Structure: - **Lines 15-19**: This block is a `try` block that attempts to open a file using a `FileInputStream` and reads an integer from it using a `Scanner`. - **Line 20**: A comment line indicating where to add additional code if necessary. - **Lines 22-27**: This section handles the condition `if (hasErr)` to check if an error, such as a file not being found, exists. If true, it prints a file not found message. Otherwise, it prints the value read from the file. This code is likely part of a program that reads integer values from specified text files and handles exceptions if the file is not found.
Transcribed Image Text:This image displays a code editor with a Java program named `ReadInputFile.java`. The editor also shows three text files: `cashew1.txt`, `cashew2.txt`, and `cashew3.txt`. Below is the transcribed code content visible in the image: ```java 15 try { 16 cashewInStream = new FileInputStream(cashewFileName); 17 cashewScanner = new Scanner(cashewInStream); 18 dataValue = cashewScanner.nextInt(); 19 } 20 /* Your code goes here */ 21 22 if (hasErr) { 23 System.out.println(cashewFileName + ": File not found"); 24 } 25 else { 26 System.out.println("Value read from " + cashewFileName + ": " + dataValue); 27 } 28 } 29 } ``` ### Explanation of Code Structure: - **Lines 15-19**: This block is a `try` block that attempts to open a file using a `FileInputStream` and reads an integer from it using a `Scanner`. - **Line 20**: A comment line indicating where to add additional code if necessary. - **Lines 22-27**: This section handles the condition `if (hasErr)` to check if an error, such as a file not being found, exists. If true, it prints a file not found message. Otherwise, it prints the value read from the file. This code is likely part of a program that reads integer values from specified text files and handles exceptions if the file is not found.
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