Java User Input
The Scanner class is used to get user input, and it is found in the java.util package.
To use the Scanner class, create an object of the class and use any of the available methods found in the Scanner class documentation. In our example, we will use the nextLine() method, which is used to read Strings:
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
}
}If you don't know what a package is, read our Java Packages Tutorial .
Input Types
In the example above, we used the nextLine() method, which is used to read Strings. To read other types, look at the table below:
| Method | Description |
|---|
In the example below, we use different methods to read data of various 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 wrong input (e.g. text in a numerical input), you will get an exception/error message (like "InputMismatchException").
You can read more about exceptions and how to handle errors in the Exceptions chapter .