Java User Input

Java scanner class is provide few standard function to deal user inputs. scanner class are exist in java.util package so before use of this class we are need to import this package.

//import package for Scanner class
import java.util.Scanner;
public class Execution{

   
    public static void main(String[] args) {
        //make object of scanner class
        Scanner action=new Scanner(System.in);

        System.out.print("Enter your hobby : ");
        String hobby=action.nextLine();//get input from keyboards

        //display user input value
        System.out.println("\nYour hobby is :"+hobby);

    }
}

Output

Enter your hobby : Cricket 

Your hobby is :Cricket

nextLine() are fetch the user input value. and in this case assigned of this value to string variable.

Help of scanner class we can access all available standard method to user input mechanism. in this example, when execute this source code. nextLine() method are get input by keyboard. nextLine() method is used to input string value. there are following methods are also available to input other data type values.

For example.

//import package for Scanner class
import java.util.Scanner;
public class Execution{

   
    public static void main(String[] args) {
        //Make object of scanner class
        Scanner action=new Scanner(System.in);

        System.out.print("Enter Product Name : ");
        String product=action.nextLine(); //get string value

        System.out.print("Enter product quantity : ");
        int quntity=action.nextInt();

        System.out.print("Enter Price of each item: ");
        double price=action.nextFloat();

        //Display input value
        System.out.println("Product Name : "+product);
        System.out.println("Quntity      : "+quntity);
        System.out.println("Price        : "+price);
        System.out.println("Total Amount : "+(price*quntity));
     

    }
}

Output

Enter Product Name : apple iphone 8    
Enter product quantity : 3
Enter Price of each item: 60000
Product Name : apple iphone 8
Quntity      : 3
Price        : 60000.0
Total Amount : 180000.0

In this example trying to convert valid input value to relative data type such a case when if is not possible to convert input value to other data type format the compiler are produced an exception. And that is terminate program abnormally. You'll can handling this program using exception handling.

Scanner Class Public methods

There is various method which are accessible in java.util.Scanner class.