如何使用Scanner.nextLine（）

Question

I use this code to input something in the String variable n, after I type what is asked, I don't want the program to print what I typed.

The code:

String n= Scanner.nextLine();

I feel is something you type after Scanner. , but I don't know what is it.

EDITED: Thanks for answer, but I don't know how to Close the Scanner. Here is the program...:

My program:

import java.util.Scanner;
public class A{
    public static void main(String args[]){
        String n;
        Scanner bananas=new Scanner(System.in); 
        System.out.println("First Digit: ");
        n=bananas.nextLine();
    }
}

When I run the program, on the screen appears: "First Digit:", then type, let's say I type "apple", the String n will be equals to "apple", it's ok, that is what I want, what I don't like is that the program prints on the screen the String n, I didn't want the program to do that, this is what happens:

First Digit: apples

What I want I the program to print is just: "First Digit: ", without showing what I typed, just keep it.

Thanks.

Answer 1

First, you have to instantiate the Scanner, like so:

Scanner scanner = new Scanner(System.in);  //if you want to read from the console

Then, you can receive your input.

String n = scanner.nextLine();

Make sure you close your scanner when you don't need it anymore:

scanner.close();

Answer 2

There is nothing tricky about it. You can do it like below and still your variable will hold your desired value.

import java.util.Scanner;
public class A{
    public static void main(String args[]){
        String n;
        Scanner bananas=new Scanner(System.in); 
        System.out.println("First Digit: ");
        n=bananas.nextLine();        // once you are done with input
        bananas.close();
    }
}

Even if you don't close scanner it won't make any difference as far as your code execution is concerned. Only a warning some where in your class will arise which doesn;t really affect your code. But still it is better to close the scanner once you are done with it. Its a good practice.