How to read User Input from Console in Java? Scanner Example (original) (raw)

Apart from reading files, Scanner can also read user input from Console in Java. Just like in the case of reading files, we have provided File as a source for scanning, We need to provide System.in as a source to scan for user input in Console. Once you created and initialized java.util.Scanner, you can use its various read method to read input from users. If you want to read String, you can use nextLine(), if you want to read integer numbers, you can use nextInt().

Subsequently you can use nextFloat() to read float input, nextDouble() to read double input etc. Scanner class also allows you to define your own pattern and scan for that.

Reading User Input using Scanner in Java - Example

Let's see a complete code example of reading user input using the Scanner class. In this Java program, we are reading User Input in form of String using Scanner's nextLine() method and numbers particular integer using nextInt() method of Scanner.

The scanner is created by passing System.in which is an InputStream as a source which means it will scan input console for data. Check out these free Java Programming courses to learn more about Scanner and other fundamental Java classes.

How to read User Input from Console in Java? Scanner Example

And, here is our complete Java program to demonstrate how to read user input from the command prompt using the Scanner class in Java.

How to read user input using Scanner in Java with Example/**
*
* Java program to read input from the console using Scanner in Java
* We pass System.in as source to Scanner which then scans Console for user input
* @author
*/
public class UserInputExample {

public static void main(String args[]) {

//Creating Scanner instance to scan console for User input
Scanner console = new Scanner(System.in);

System.out.println("System is ready to accept input, please enter name : ");
String name = console.nextLine();
System.out.println("Hi " + name + ", Can you enter an int number now?");
int number = console.nextInt();
System.out.println("You have entered : " + number);
System.out.println("Thank you");

}

}

Output:
The system is ready to accept input, please enter the name :
John
Hi John, Can you enter an int number now?
56
You have entered: 56
Thank you

That's all on How to read user input using Scanner in Java program. The scanner allows you to read various types of input directly from the User without extra conversion e.g. you can read int, float, long, double, or String directly.

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