Home - News ( United States | United Kingdom | Italy | Germany ) - Football scores

Showing content from https://www.tutorialspoint.com/java/java_user_input.htm below:

Java - User Input

To take input from the user in Java, the Scanner class is used. The Scanner class a built-in class of java.util package.

Java Scanner class provides many built-in methods to take different types of user inputs from the users.

The following are the steps to use Scanner class for the user input in Java −

Fist you need to import the Scanner class to use its methods. To import the Scanner class, use the following import statement −

import java.util.Scanner 

After importing the Scanner class, you need to create its object to use its methods. To create an object of the Scanner class, invoke Scanner() constructor.

Below is the statement to create an object of Scanner class −

Scanner obj = new Scanner(System.in);

Scanner class provides a variety of methods which are useful to take user input of different types. For example, if you want to input an integer value, use nextInt() method.

The following is the statement to take user input in Java −

int age = obj.nextInt();

The above statement will wait for an integer input from the user. When user provides an integer value, that will be assign to "age" variable.

In the following example, we are reading two integers from the user, calculating, and printing their addition −

// Importing the class
import java.util.Scanner;

public class AddTwoNumbers {
   public static void main(String[] args) {
      // Creating an object of Scanner class
      Scanner sc = new Scanner(System.in);

      // Reading two Integer numbers
      // using nextInt() method
      System.out.print("Enter the first number: ");
      int num1 = sc.nextInt();

      System.out.print("Enter the second number: ");
      int num2 = sc.nextInt();

      // Calculating the sum
      int sum = num1 + num2;

      // Printing the su
      System.out.println("The sum of the two numbers is: " + sum);
   }
}

Enter the first number: 10
Enter the second number: 20
The sum of the two numbers is: 30

The Scanner class provides different methods for the different types of User inputs. To explore all methods for different user inputs, look at the table below −

The nextInt() method is used to take input of an integer from the user.

In the following example, we are taking an integer as an input −

// Importing the class
import java.util.Scanner;

public class IntegerInput {
   public static void main(String[] args) {
      // Creating an object of Scanner class
      Scanner sc = new Scanner(System.in);

      // Reading an Integer Input
      System.out.print("Input an integer value: ");
      int int_num = sc.nextInt();

      System.out.print("The input is : " + int_num);
   }
}

Input an integer value: 101
The input is : 101

The nextFloat() method is used to take input of a float value from the user.

In the following example, we are taking a float as an input −

// Importing the class
import java.util.Scanner;

public class IntegerInput {
   public static void main(String[] args) {
      // Creating an object of Scanner class
      Scanner sc = new Scanner(System.in);

      // Reading a Float Input
      System.out.print("Input a float value: ");
      float float_num = sc.nextFloat();

      System.out.print("The input is : " + float_num);
   }
}

Input a float value: 12.345
The input is : 12.345

The nextLine() method is used to take input of a string value from the user.

In the following example, we are taking a string as an input −

// Importing the class
import java.util.Scanner;

public class IntegerInput {
   public static void main(String[] args) {
      // Creating an object of Scanner class
      Scanner sc = new Scanner(System.in);

      // Reading a String Input
      System.out.print("Input a string value: ");
      String str = sc.nextLine();

      System.out.print("The input is : " + str);
   }
}

Input a string value: Hello World
The input is : Hello World

RetroSearch is an open source project built by @garambo | Open a GitHub Issue

Search and Browse the WWW like it's 1997 | Search results from DuckDuckGo

HTML: 3.2 | Encoding: UTF-8 | Version: 0.7.4