Java Program to Print an Integer Entered by the User

Tutorialsrack 19/04/2021 Java

In this Java Program, you will learn how to print an Integer entered by the user. The integer is stored in a variable using System.in, and is displayed on the monitor display using System.out.

Java Program to Print an Integer Entered by the User

//Java Program to Print an Integer Entered by the User

import java.util.Scanner;

public class PrintInteger {

	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 the Number: " + number);
    }
}

Understand the Program

• In the above program, an object of Scanner class, the reader is created to take inputs from standard input, which is the 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 newline character \n using Enter Key. The entered integers are then saved to the integer variable number.
• If you enter any character which is not an integer, then the compiler will throw an exception which is InputMismatchException.

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

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