Hello Cheggs I need your guidance on a task I need to figure out. The book for t
ID: 3860589 • Letter: H
Question
Hello Cheggs I need your guidance on a task I need to figure out. The book for the class is Introduction to Java Programming, Comprehensive Version Y. Daniel Liang & Prentice Hall 11th Edition / 2018. We are currently working in Chapter 12. This chapers covers the followoing:
Exception Handling
Input Validation
File Class Input & Output
What issues do you find with the following code? Report back with line numbers and your fix for each issue you find.
1
2 File fileDir = new File("C: est");
3 File file = new File("C://test//test.txt");
4 if (fileDir.exists()) {
5 fileDir.mkdir();
6 System.out.println("The directory does not exist. Creating directory...");
7 } else {
8 System.out.printf("The directory does exist at this location: %s ", fileDir.getAbsolutePath());
9 }
10 if (file.exists()) {
11 System.out.println("The file does not exist. Creating file...");
12 file.createFile();
13 System.out.printf("The file now exists and is located here: %s ", file.getAbsolutePath());
14 } else {
15 System.out.printf("The file already exists and is located here: %s ", file.getAbsolutePath());
16 }
17
18 PrintWriter output = new PrintWriter(fileName);
19 double amount = 456.73;
20 for (int i = 1; i <= 10; i++) {
21 output.printf("Account %d: $%.2f" + System.getProperty("line.separator"), i, amount += 23.45);
22 }
23 output.close();
24
25 try (Scanner input = new Scanner(file)) {
26 System.out.println("The contents of the file are listed below:");
27 while (input.hasNext()) {
28 String line = input.nextLine();
29 System.out.println(line);
30 }
31 }
32 input.close();
33
Explanation / Answer
Line 2 :
File name is invalid, since in C: est will be interpreted as tabspace.
Line 4 checks for existence of the file. (fileDir.exists()). And creates a new file using mkDir. But file should only be created if it doesn't exist. Condition must be if(!fileDir.exists())
Line 10 : Condition must be !file.exists() instead of file.exists()
Line 12 : createFile() is not a valid method. It must be createNewFile()
Line 18: fileName string in the PrintWriter object must be defined
Line 32 : input object doesn't exist.
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