Java – Scanner Class – Ameerpet Technologies

Scanner Class:

Using java library class Scanner, we can read input like integers, characters, strings, double values from the user.
Different methods to read different values such as nextInt(), next(), nextDouble()…
We need to specify the Keyboard(System.in) while creating Scanner class object.
- Scanner scan = new Scanner(System.in);
We access all the methods using object reference name.

Reading integer value: nextInt() method read and returns an integer value

import java.util.Scanner;
public class Practice
{
          public static void main(String[] args)
          {
                        Scanner scan = new Scanner(System.in);
                        System.out.print(“Enter integer value : “);
                        int n = scan.nextInt();
                        System.out.println(“Input value is : ” + n);
          }
}

Reading int, double and boolean:

import java.util.Scanner;
public class Practice
{
          public static void main(String[] args)
          {
                        Scanner scan = new Scanner(System.in);
                        System.out.print(“Enter Emp ID : “);
                        int id = scan.nextInt();

                        System.out.print(“Enter Emp salary : “);
                        double salary = scan.nextDouble();

                        System.out.print(“Enter Emp maritual state : “);
                        boolean married = scan.nextBoolean();

                        System.out.println(“Emp details are : ” + id + ” , ” + salary + ” , ” + married);
          }
}

Reading String: using next() method we can read single word string from the user

import java.util.Scanner;
public class Practice
{
          public static void main(String[] args)
          {
                        Scanner scan = new Scanner(System.in);
                        System.out.print(“Enter your name : “);
                        String name = scan.next();

                        System.out.println(“Hello ” + name);
          }
}

Reading character: There is no method in Scanner class to read single character, hence we read first character of String to read single character as follows

import java.util.Scanner;
public class Practice
{
          public static void main(String[] args)
          {
                        Scanner scan = new Scanner(System.in);
                        System.out.print(“Enter character : “);
                        char ch = scan.next().charAt(0);

                        System.out.println(“Input character is : ” + ch);
          }
}

Reading Employee details:

import java.util.Scanner;
public class Practice
{
          public static void main(String[] args)
          {
                        Scanner scan = new Scanner(System.in);
                        System.out.print(“Enter emp details(id, name, gender, salary, married : “);

                        int id = scan.nextInt();
                        String name = scan.next();
                        char gender = scan.next().charAt(0);
                        double salary = scan.nextDouble();
                        boolean married = scan.nextBoolean();

                        System.out.println(“Details are : ” + id + “, ” + name + ” , ” + gender + ” , ” + salary + ” , ” + married);
          }
}

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