In this page you are going to learn about :
- Reading User input
- Scanner Class
- Important Scanner Method
Reading User Input
To read the user input, Scanner class is used with a standard input stream System.in
Scanner Class
- Scanner class is defined in java.util package
- Java provides various ways to read input from the keyboard, the java.utl.Scanner class is one of them
- Scanner class is widely used to parse text for string and primitive types using a regular expression.
- Scanner breaks its input into tokens using a delimiter pattern
Syntax :
Scanner scanner ojbect = new Scanner(System.in);
Important Scanner Methods
- nextInt() -> Scans the next token of the input as an int.
- nextDouble() -> Scans the next token of the input as a double.
- nextLine() -> Advances this scanner past the current line and returns the input that was skipped
- next() -> Finds and returns the next complete token from this scanner.
- nextFloat() -> Scans the next token of the input as a float.
- hasNext() -> Returns true if this scanner has another token in its input
Example
public class UserInput {
public static void main(String[] args)
{
Scanner in = new Scanner(System.in);
//user input for string
System.out.println("Enter your name:");
String name = in.next();
System.out.println("Your name is: "+ name);
//user input for integer
System.out.println("What is your age?");
int age = in.nextInt();
System.out.println("Your age is : " + age);
}
}
