How Java uses the Scanner class to get user input

Editor to share with you how Java uses the Scanner class to get user input, I believe most people do not know much about it, so share this article for your reference, I hope you can learn a lot after reading this article, let's go to know it!

The basic syntax for creating a Scanner object:

Scanner s = new Scanner (System.in)

The next () method of the Scanner class

Import java.util.Scanner;class Test {public static void main (String [] args) {String s; Scanner userInput = new Scanner (System.in); System.out.print ("Input String:"); if (userInput.hasNext ()) {s = userInput.next (); System.out.println (s);} userInput.close ();}}

If you run the result as follows, you will find that the English after the space has not been printed:

PS C:\ Users\ admin\ Desktop\ java_code\ user input > java TestInput String: Hello WorldHelloPS C:\ Users\ admin\ Desktop\ java_code\ user input >

NextLine method of the Scanner class

Modify the code on the basis of the above:

Import java.util.Scanner;class Test {public static void main (String [] args) {String s; Scanner userInput = new Scanner (System.in); System.out.print ("Input String:"); if (userInput.hasNextLine ()) {s = userInput.nextLine (); System.out.println (s);} userInput.close ();}}

As a result, the English after the space can also be printed:

PS C:\ Users\ admin\ Desktop\ java_code\ user input > javac Test.javaPS C:\ Users\ admin\ Desktop\ java_code\ user input > java TestInput String: Hello WorldHello World

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