Scanner class in java. #5 смотреть онлайн

In Java, the Scanner class is used to read input from various sources, such as the keyboard, a file, or a string. Here are some important notes on the Scanner class:

The Scanner class is part of the java.util package, so you need to import it at the beginning of your program with the statement "import java.util.Scanner;"

To use the Scanner class to read input from the keyboard, you can create an instance of the class using the following code:

Scanner scanner = new Scanner(System.in);
This creates a new Scanner object that reads input from the standard input stream (i.e., the keyboard).

To read input from the user, you can use the various methods of the Scanner class, such as next(), nextInt(), nextDouble(), etc. For example, to read a string input from the user, you can use the following code:

String input = scanner.next();

This reads the next word (i.e., a sequence of characters separated by whitespace) from the user's input and stores it in the "input" variable.

The Scanner class also provides methods to read input of other data types, such as integers and doubles. For example, to read an integer input from the user, you can use the following code:

int input = scanner.nextInt();

This reads the next integer from the user's input and stores it in the "input" variable.

The Scanner class also provides methods to check whether there is more input to be read, using methods such as hasNext() and hasNextLine().

It is important to close the Scanner object after you have finished reading input, using the close() method. This releases any system resources associated with the Scanner object.

These are some important notes on the Scanner class in Java. The Scanner class is a powerful tool for reading input in Java, and it is important to understand its methods and how to use them effectively.