Scanner Class In Java

It allows reading input from the keyboard.
java.util package is used in scanner class 
e.g:

import java.util.*;

or

import java.util.Scanner;

System.in(keyboard): It represents the standard input stream

System.out(monitor): It represents the standard output stream

Methods of scanner class:

There are different types of predefined methods which are used in Scanner class like

public byte nextByte()

It is used to read a value of type byte

public short nextShort()

 It is used to read a value of type short

public long nextLong()

It is used to read a value of type long

public int nextInt()

 It is used to read a value of type int

public float nextFloat()

 It is used to read a value of type float

public double nextDouble()

 It is used to read a value of type double

public String next()

It returns the next token/word in the input as a string.

public String nextLine()

It is used to read strings.

charAt(0)
It returns the first character in that string.

next().charAt(0)

It is used to read a single character

Example 1:

import java.util.Scanner;

public class Add {

public static void main(String[] args) {

  Scanner sc = new Scanner(System.in);

  

  System.out.print("Input first number:\n ");

  int num1 = sc.nextInt();

  

  System.out.print("Input second number:\n ");

  int num2 = sc.nextInt();

  System.out.println("sum is:"+ (num1 + num2));

  }

 }

Output:

Input first number:

12

Input second number:

13

sum is:25

   Example 2:

    import java.util.Scanner;

    public class Student {

   public static void main(String[] args) {

   Scanner sc = new Scanner(System.in);

  

  System.out.print("Enter Name \n");

  String name = sc.next();

  System.out.print("Enter Age \n");

  int  age = sc.nextInt();

  System.out.print("Enter Gender(M OR F) \n");

  char gender= sc.next().charAt(0);

 System.out.print("Enter Mark \n");

  double marks = sc.nextDouble();

 System.out.println("Student information:\n"+"name :"+name+"\nage:"+age+"\ngender:"+ gender+"\nmarks"+marks);

 }

 }

Output:

Enter Name

Dev

Enter Age

25

Enter Gender(M OR F)

M

Enter Mark

67

Student information:

Name:Dev

Age:25

Gender:M

Marks:67