Question

Liệt kê các lỗi có trong chương

Answer 1

Answer:

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Explanation:

Create an object of the File class

 Pass it the name of the file to read in quotes

 Then create an object of the Scanner class

 Pass the constructor the new File object

 Then use Scanner methods such as:

 next()

 nextLine()

 hasNextLine()

 hasNext()

 nextDouble()

 nextInt()...

File inputFile = new File("input.txt");

while (in.hasNextLine())

{

String line = in.nextLine();

// Process line;

}

Scanner in = new Scanner(inputFile);

Text File Output

 Create an object of the PrintWriter class

 Pass it the name of the file to write in quotes

• If output.txt exists, it will be emptied

• If output.txt does not exist, it will create an empty file

PrintWriter is an enhanced version of PrintStream

• System.out is a PrintStream object!

PrintWriter out = new PrintWriter("output.txt");

out.println("Hello, World!");

out.printf("Total: %8.2f\n", totalPrice);

System.out.println(“Hello World!”);

 Then use PrintWriter methods such as:

 print()

 println()

 p