Java program to print an integer (input by the user)

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

Example: How to print the integer input by the user

import java.util.Scanner;
public class HelloWorld {
　　　　public static void main(String[] args) {
　　　　　　　　
　　　　　　　　//Create an instance of a reader
　　　　　　　　//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() will print the following line to the output screen
　　　　　　　　System.out.println("You entered: ",　+　number);
　　　　}
}

When the program is run, the output is:

Enter a number:　10
You entered:　10

In this program, an object of the Scanner class reader is created to obtain input from the standard input (i.e., the keyboard).

Then, 'Enter a number' will print a prompt to provide the user with a visual hint about the next operation.

Then, reader.nextInt() will read all the integers entered from the keyboard, unless a newline character \ n (Enter) is encountered. Then, the entered integers are saved to the integer variable number.

If the input character is not an integer, the compiler will throw an InputMismatchException.

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