Technical Programming: Use Of Scanner Class For Reading Input Form Keyboard By Users.

Program To Input Or Read And Print Roll No. , Name and Percentage Marks For A Student Using Scanner Class.

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Why we use Input Stream ?
Input Stream class defines the following methods for reading bytes :
int read() throws IOException
int read(byte b[]) throws IOException
int read(byte b[], int offset, int length) throws IOException

Scanner Class : The Scanner Class is a class used for "scanning" primitive types and Strings.It can be used to get input from an Input Stream , to parse through a string of text or to read from a file.

Syntax :
1. The following code snippet shows how to read an integer from the keyboard :

                      Scanner scanner=new Scanner(System.in);
                      int i = scanner.nextInt();


2. The following code snippet shows how to read a String from the keyboard :

   String S;
                       Scanner scanner=new Scanner(System.in);
   System.out.println("Enter a string");
   S=scanner.next();

Program

import java.io.*;

import java util.*;

class Scan

{

public static void main(String args[]) throws IOException

{

Scanner obj=new Scanner(System.in);

int rno;

String name;

float percentage;

System.out.println("Enter a Roll No.");

rno= obj.nextInt();

System.out.println("Enter a Name");

name=obj.next();

System.out.println("Enter a percentage marks");

percentage=obj.nextFloat();

System.out.println("Roll No."+ rno);

System.out.println("Name"+ name);

System.out.println("Percentage Marks"+ percentage);

obj.close();

}

Output

Roll No. 1

Name Amir Khan

Percentage Marks 87%

Expert Review: This program will help you to read the input given by the users from keyboard as there are many methods but this method is the best and simplest , easy code as well as shorter codes which will be eas for you to remeber.

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