beginnersbook.com

  • Home
  • All Tutorials
    • Learn Servlet
    • Learn JSP
    • Learn JSTL
    • Learn C
    • Learn C++
    • Learn MongoDB
    • Learn XML
    • Learn Python
    • Learn Perl
    • Learn Kotlin
  • Core Java
  • OOPs
  • Collections
  • Java I/O
  • JSON
  • DBMS

Java Program to get input from user

By Chaitanya Singh | Filed Under: Java Examples

In this tutorial we are gonna see how to accept input from user. We are using Scanner class to get the input. In the below example we are getting input String, integer and a float number. For this we are using following methods:
1) public String nextLine(): For getting input String
2) public int nextInt(): For integer input
3) public float nextFloat(): For float input

Example:

import java.util.Scanner;

class GetInputData
{
  public static void main(String args[])
  {
     int num;
     float fnum;
     String str;
 
     Scanner in = new Scanner(System.in);
 
     //Get input String
     System.out.println("Enter a string: ");
     str = in.nextLine();
     System.out.println("Input String is: "+str);
 
     //Get input Integer
     System.out.println("Enter an integer: ");
     num = in.nextInt();
     System.out.println("Input Integer is: "+num);
 
     //Get input float number
     System.out.println("Enter a float number: ");
     fnum = in.nextFloat();
     System.out.println("Input Float number is: "+fnum); 
  }
}

Output:

Enter a string: 
Chaitanya
Input String is: Chaitanya
Enter an integer: 
27
Input Integer is: 27
Enter a float number: 
12.56
Input Float number is: 12.56

Reference:
Scanner Javadoc

Enjoyed this post? Try these related posts

  1. Java Program to Calculate Power of a Number
  2. Java program for linear search – Example
  3. Java program to calculate area of Square
  4. Java Program to Add Two Matrix using Multi-dimensional Arrays
  5. Java Program to find the Smallest of three numbers using Ternary Operator
  6. Java program to check prime number

Comments

  1. jocelyn says

    September 11, 2017 at 8:59 PM

    hi,
    why i use scanner.nextLine(), it doesnt seem to allow me to input the value but automatically read the space as the string thus print it out…
    could you please explain? thanks!

    System.out.println(“input the String:”);
    str = scanner.nextLine();
    System.out.println(“the String you input is: ” + str);

    Reply
    • Jafet says

      September 24, 2017 at 10:10 AM

      It will not work that way. You have to use “in” instead of scanner. e.g Scanner in = new Scanner(System.in);

      Therefore it will be like this to work:
      System.out.println(“input the String: “);
      str = in.next();
      System.out.println( ” the String you input is: ” + str);

      Reply

Leave a Reply Cancel reply

Your email address will not be published. Required fields are marked *

Programs

  • C Programs
  • Java Programs

Java Examples

  • Check Odd-even
  • Linear Search
  • Binary Search
  • Floyd's Triangle
  • Reverse number
  • Random Number
  • first n prime numbers
  • Disp prime Numbers
  • Check Prime number
  • Palindrome String
  • Find factorial
  • Sum of elements of Array
  • Area of rectangle
  • Area of Square
  • Area of Triangle
  • Circle

Tutorials

  • Java Tutorial
  • OOPs Concepts
  • Java String
  • Exception handling
  • Java Multithreading
  • Java I/O
  • Java Serialization
  • Java Regex
  • Java AWT
  • Java Swing
  • Java Enum
  • Java Annotations

Recently Added..

  • JSON Tutorial
  • Java Regular Expressions Tutorial
  • Java Enum Tutorial
  • Java Annotations Tutorial

Copyright © 2012 – 2021 BeginnersBook . Privacy Policy . Sitemap