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

Java Program to Print an Integer

(Entered by the User)

Printing an integer entered by a user is one of the most basic and fundamental operations in Java programming. In this article, we will discuss how to print an integer entered by a user in Java.

Before we begin, it is important to understand what an integer is in Java. An integer is a data type that is used to represent whole numbers, which can be either positive, negative, or zero. In Java, the int keyword is used to declare a variable of type integer.

Now, let us see how we can print an integer entered by a user in Java. There are several ways to achieve this, and we will discuss some of the most common methods.

Method 1: Using Scanner Class

The Scanner class is a widely used class in Java for reading user input. We can use this class to read an integer entered by a user and then print it on the console. Here is an example code snippet:

java

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import java.util.Scanner;

public class PrintInteger {

    public static void main(String[] args) {

        Scanner scanner = new Scanner(System.in);

        System.out.print("Enter an integer: ");

        int num = scanner.nextInt();

        System.out.println("You entered: " + num);

    }

}

In this code, we first import the Scanner class from the java.util package. We then create an object of the Scanner class and use it to read an integer entered by the user. The nextInt() method of the Scanner class is used to read the integer entered by the user. Finally, we print the integer on the console using the println() method.

Method 2: Using BufferedReader Class

The BufferedReader class is another commonly used class in Java for reading user input. We can use this class to read an integer entered by a user and then print it on the console. Here is an example code snippet:

java

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import java.io.BufferedReader;

import java.io.IOException;

import java.io.InputStreamReader;

public class PrintInteger {

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

        BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));

        System.out.print("Enter an integer: ");

        int num = Integer.parseInt(reader.readLine());

        System.out.println("You entered: " + num);

    }

}

In this code, we first import the BufferedReader and InputStreamReader classes from the java.io package. We then create an object of the BufferedReader class and use it to read an integer entered by the user. The readLine() method of the BufferedReader class is used to read the integer entered by the user as a string. We then use the parseInt() method of the Integer class to convert the string to an integer. Finally, we print the integer on the console using the println() method.

Method 3: Using Console Class

The Console class is another class in Java that can be used to read user input. However, this class is only available in Java 6 and later versions. Here is an example code snippet:

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public class PrintInteger {

    public static void main(String[] args) {

        Console console = System.console();

        if (console == null) {

            System.out.println("Console not available");

            return;

        }

        System.out.print("Enter an integer: ");

        int num = Integer.parseInt(console.readLine());

        System.out.println("You entered: " + num);

    }

}

In this code, we first create an object of the Console class using the System.console() method. We then check if the console object is null or not. If the console object is null, we print a message saying that the console is not available. If the console object is not null, we use it to read an integer entered by the user. We then use the parseInt() method of the Integer class to convert the string to an integer.

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