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Java User Input (Scanner)

Java User Input

The scanner class is used to find user input, and is available in the java.util package.

To use the scanner class, create a class object and use any of the methods available in the scanner class. In our example, we will use the following nextLine() method, which is used to read Cables:

Example

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

            class Main {
              public static void main(String[] args) {
                Scanner myObj = new Scanner(System.in);  // Create a Scanner object
                System.out.println("Enter username");
            
                String userName = myObj.nextLine();  // Read user input
                System.out.println("Username is: " + userName);  // Output user input
              }
            }

Input Types

In the example above, we used the following method nextLine(), which is used to read Strings. To learn more about the genres, see the table below:

Method	Description
`nextBoolean()`	Reads a `boolean` value from the user
`nextByte()`	Reads a `byte` value from the user
`nextDouble()`	Reads a `double` value from the user
`nextFloat()`	Reads a `float` value from the user
`nextInt()`	Reads a `int` value from the user
`nextLine()`	Reads a `String` value from the user
`nextLong()`	Reads a `long` value from the user
`nextShort()`	Reads a `short` value from the user

In the example below, we use a variety of methods to read data of different types:

Example

import java.util.Scanner;

            class Main {
              public static void main(String[] args) {
                Scanner myObj = new Scanner(System.in);
            
                System.out.println("Enter name, age and salary:");
            
                // String input
                String name = myObj.nextLine();
            
                // Numerical input
                int age = myObj.nextInt();
                double salary = myObj.nextDouble();
            
                // Output input by user
                System.out.println("Name: " + name);
                System.out.println("Age: " + age);
                System.out.println("Salary: " + salary);
              }
            }

Note: If you enter incorrect input (eg text in numerical input), you will get an error / error message (such as "InputMismatchException").

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Java User Input (Scanner)

Java User Input

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