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Learn Java by Example: Java Program to Print an Integer

By on Friday, April 16, 2021

Java Program to Print an Integer (Entered by the User)

In this program, you’ll learn to print a number entered by the user in Java. The integer is stored in a variable using System.in, and is displayed on the screen using System.out.

Example: How to Print an Integer entered by an user


import java.util.Scanner;

public class HelloWorld{

    public static void main(String[] args){

        // Creates a reader instance which takes
        // input from standard input - keyboard
        Scanner reader = new Scanner(System.in);
        System.out.print("Enter a number: ");

        // nextInt() reads the next integer from the keyboard
        int number = reader.nextInt();

        // println() prints the following line to the output screen
        System.out.println("You entered: " + number);
    }
}

Output

Enter a number: 10
You entered: 10

In this program, an object of Scanner class, reader  is created to take inputs from standard input, which is keyboard.

Then, Enter a number prompt is printed to give the user a visual cue as to what they should do next.

reader.nextInt()then reads all entered integers from the keyboard unless it encounters a new line character n (Enter). The entered integers are then saved to the integer variable number.

If you enter any character which is not an integer, the compiler will throw an InputMismatchException.

Finally, number is printed onto the standard output (System.out) – computer screen using the function println().

 

 

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Disclaimer: The information and code presented within this recipe/tutorial is only for educational and coaching purposes for beginners and developers. Anyone can practice and apply the recipe/tutorial presented here, but the reader is taking full responsibility for his/her actions. The author (content curator) of this recipe (code / program) has made every effort to ensure the accuracy of the information was correct at time of publication. The author (content curator) does not assume and hereby disclaims any liability to any party for any loss, damage, or disruption caused by errors or omissions, whether such errors or omissions result from accident, negligence, or any other cause. The information presented here could also be found in public knowledge domains.
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