java.util.Scanner Class:

It is used to read input from keyboard. It breaks the input provided into tokens using a delimeter (Whitespace). It extends Object  class and implements Iterator & Closeable interface. To use Scanner class we have to import java.util.Scanner package.

Commonly used methods of Scanner class:

public String next() : returns the next token from the scanner.

public int nextInt():  scans the next token as an int value.

public float nextFloat(): scans the next token as a float value

public double nextDouble(): scans the next token as a double value.


Example:

   

 import java.util.Scanner;
    class ScannerDemo{
     public static void main(String args[]){
       Scanner scan=new Scanner(System.in);

       System.out.println("Enter your ID");
       int id=scan.nextInt();       // reading ID provided by user
       System.out.println("Enter your name");
       String name=scan.next();      // reading name provided by user
       System.out.println("Enter your Salary");
       double salary=scan.nextDouble();       // reading salary provided by user
       System.out.println("ID:"+id+" name:"+name+" salary:"+salary);
       scan.close();
     }
    }

  Output:

     

       Enter your ID
       101
       Enter your name
       Ajay
       Enter your Salary
       450000
       ID:101 name:Ajay Salary:15000