What are other uses of Scanner?

The Scanner class in Java is versatile and can be used for various input handling tasks. Here are some common uses:

1. Reading Different Data Types:

• String Input:

  String text = scanner.nextLine();

• Integer Input:

  int number = scanner.nextInt();

• Double Input:

  double decimal = scanner.nextDouble();

2. Reading from Files:

You can use Scanner to read data from files:

File file = new File("data.txt");
Scanner fileScanner = new Scanner(file);
while (fileScanner.hasNextLine()) {
    String line = fileScanner.nextLine();
    System.out.println(line);
}
fileScanner.close();

3. Tokenizing Input:

Scanner can break input into tokens based on specified delimiters (default is whitespace):

String input = "Java is fun";
Scanner tokenScanner = new Scanner(input);
while (tokenScanner.hasNext()) {
    System.out.println(tokenScanner.next());
}
tokenScanner.close();

4. Parsing Input:

You can use Scanner to parse formatted input:

String data = "John 25";
Scanner parseScanner = new Scanner(data);
String name = parseScanner.next();
int age = parseScanner.nextInt();
parseScanner.close();

5. Checking for Valid Input:

You can check if the next input is of a specific type before reading it:

if (scanner.hasNextInt()) {
    int value = scanner.nextInt();
} else {
    System.out.println("Not an integer!");
}

Summary:

The Scanner class is a powerful tool for handling user input, reading from files, and parsing data in Java applications. If you have more questions or need examples, feel free to ask!