Java User Input

Java User Input

Use the Scanner class to read input typed by the user. It lives in the java.util package.

Create a Scanner

import java.util.Scanner;

Scanner myObj = new Scanner(System.in);

System.in is the keyboard input stream.

Read different types

Example: read a line

import java.util.Scanner;

class Main {
  public static void main(String[] args) {
    Scanner myObj = new Scanner(System.in);
    System.out.println("Enter username");

    String userName = myObj.nextLine();
    System.out.println("Username is: " + userName);
  }
}

Close the scanner

When you are done, close it to free resources:

myObj.close();

TL;DR

• Import java.util.Scanner and create new Scanner(System.in).
• nextLine(), nextInt(), nextDouble() read typed values.
• Close the scanner when finished.