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What is scanner class in Java?
What is scanner class in Java?
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Rahul1995seven
1 post
Jun 05, 2023
9:33 PM
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In Java, the Scanner class is a part of the Java. util package and is used to read input from various sources, such as the keyboard or a file. It provides convenient methods for parsing and tokenizing input into different data types.
The Scanner class can be used to read input of different types, including primitive types (int, double, etc.), strings, and regular expressions. It allows you to break down the input into tokens and extract specific information from it.
To use the Scanner class, you need to create an instance of it and associate it with a specific input source. Here's a simple example that demonstrates the basic usage of a Scanner to read input from the keyboard:
javaCopy codeimport java.util.Scanner;
public class ScannerExample {
public static void main(String[] args) {
Scanner scanner = new Scanner(System.in);
Syst em.out.print("Enter your name: ");
String name = scanner.nextLine();
Sy stem.out.print("Enter your age: ");
int age = scanner.nextInt();
System.out.println("Hello, " + name + "! You are " + age + " years old.");
scanner.close();
}
}
In this example, Scanner is used to read a line of text and an integer from the keyboard. The nextLine() method is used to read the entire line of text, and the nextInt() method is used to read the integer value. Finally, the values are printed out.
Note that after you are done using the Scanner, it's important to close it using the close() method to release any underlying resources.
Apart from reading input from the keyboard, Scanner can also be used to read from files, strings, or other input sources by providing them as parameters during the instantiation of the Scanner object.
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1 post
Jun 05, 2023
10:58 PM
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JULIA777
77 posts
Jun 08, 2023
11:49 PM
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