This question already has answers here:
What does Scanner input = new Scanner(System.in) actually mean?
(5 answers)
Closed 4 years ago.
Can anyone one tell what this statement exactly does?
Scanner input = new Scanner(System.in) ;
what is (input) a variable or an object.What is System.in?
Please someone tell me what is meaning of this whole statement
input
is a variable, more precisely an instance object of the class
Scanner
when you do
Scanner input = new Scanner(System.in);
you create a variable named input that is a Scanner instance and reads inputs from the standard console until you close it with
input.close();
note that you cannot reopen the instance if you close it, if you want to re-read inputs you have to recreate it with:
input = new Scanner(System.in);
Related
This question already has answers here:
Close a Scanner linked to System.in
(5 answers)
Scanner is never closed
(4 answers)
Closed 3 months ago.
sc function is never closed. What to do to avoid this error?
I tried to input integer data using scanner function in java, but the sc line is facing some error. Although the code runs properly. But I want to know why it showing error. Thanks in advance.
This question already has answers here:
Resource leak: 'in' is never closed
(14 answers)
Closed 8 months ago.
enter image description here
I just started learning java today. I am now stuck in this user input coding. I have tried many methods but I cannot run this user input code.
As the others already stated closing the scanner is best practice.
If you use Java 8 or higher you can do it the following way:
try(Scanner sc = new Scanner(System.in))
{
String name = sc.nextLine();
System.out.println(name);
}
Besides that your code already works! When you run the program it's waiting for input, so you need to write some text into the console-Window and press enter
This question already has answers here:
How to get the user input in Java?
(29 answers)
Closed 6 years ago.
I am an AP Computer Science student who is trying to write a console-based text editor. My teacher taught me how to read input using Scanner(System.in), but in a text-editor, you need to get input directly from the keyboard. How do I gain access to keystrokes without using the Scanner class, or a similar parallel? For example, BufferReader(new InputStreamReader(System.in))
EDIT: My point was how read without waiting for user to press enter (otherwise users couldn't add text in real time)
EDIT: Why are you saying my question is a duplicate of that question? I explicitly asked for a method of getting input without waiting fo ruser to press enter. The answers to that other question do not resolve that at all!
You can use this :
System.out.print("Please enter your String :\t");
String sentence = scanner.nextLine();
This question already has answers here:
How to get the user input in Java?
(29 answers)
Closed 8 years ago.
I am trying to build a program that talks to the user and I want it to know as much as possible. For that I need an ability to use what the user types in my programs code and not just in variables in a way that it is fully implemanted in to the code
Or if there is now way, you know of just Tell me and I will accept it.
The Scanner class can be used for input. Example:
Scanner scanner = new Scanner(System.in);
String age = "";
System.out.println("Please enter your age:");
age = scanner.next();
This code will get user input via the console.
This question already has answers here:
Java Scanner with InputStream not working
(2 answers)
Closed 8 years ago.
I am working on an android app so I need to use an InputStream() to read a txt file but I also have several methods that only work with Scanner() so I need a way to convert InputStream() to Scanner().
Thanks in advance.
You can open scanner for this input stream. Like that:
// inputStreamInstance - input stream you want to convert to scanner
Scanner scanner = new Scanner(inputStreamInstance);