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);
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.
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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:
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);
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:
I want to print any text without using Print function in java?
(5 answers)
Closed 8 years ago.
I have no idea how to start writing a java code to print
a string without using any inbuilt function like println etc.
Does anyone know how to write it?
I will not paste you all the article you can read here: http://luckytoilet.wordpress.com/2010/05/21/how-system-out-println-really-works/
But read it and look the repetition of "native" word.
Then you can jump to this other post : What is a native implementation in Java?
Then, you will have the presumption that you cannot write to process standard stream (or error) without using any native function, because you need something runnable on different OS... and that's the goal of the JVM.
You can write it using PrintWriter class
PrintWriter printWriter = new PrintWriter(System.out);
printWriter.write("Hello");
printWriter.flush();
printWriter.close();