What is scanner class in java with example

In Java, the Scanner class is part of the java.util package and provides a convenient way to read and parse user input from various sources, such as the console or files. It allows you to interact with the user by reading different types of data, such as integers, floating-point numbers, strings, and more. Here's an example that demonstrates the usage of the Scanner class:

java
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import java.util.Scanner;

public class ScannerExample {
public static void main(String[] args) {
// Creating a Scanner object to read user input from the console
Scanner scanner = new Scanner(System.in);

System.out.print("Enter your name: ");
String name = scanner.nextLine(); // Read a line of text from the user

System.out.print("Enter your age: ");
int age = scanner.nextInt(); // Read an integer from the user

System.out.print("Enter your GPA: ");
double gpa = scanner.nextDouble(); // Read a double from the user

// Displaying the user's input
System.out.println("Name: " + name);
System.out.println("Age: " + age);
System.out.println("GPA: " + gpa);

// Closing the scanner
scanner.close();
}
}
In the example above, we create a Scanner object by passing System.in as the input source, which represents the standard input (console). We use various methods provided by the Scanner class to read user input:

nextLine(): Reads a line of text from the user.
nextInt(): Reads an integer from the user.
nextDouble(): Reads a double from the user.
After reading the input, we display the user's entered values on the console. It's important to note that the Scanner class provides methods for reading various other types of data as well, such as nextBoolean(), nextFloat(), and next() for reading individual words.

Remember to close the Scanner object using the close() method to release system resources.

The Scanner class is versatile and can also be used to read input from files or other sources by passing the appropriate InputStream or File object as the input source when creating the Scanner object.