如何使用带整数的java.util.Scanner

Question

I just started learning java and I want to make a simple program where it requests the persons name, outputs the name then asks for the thier favorite number. It will then compare their number to the number 6 and will output something depending on if the number is larger or smaller than 6.

I am getting a "String to int convert" error in Netbeans which has to do with the scanner. Hopefully I am asking this correctly but how can I make the scanner pick-up integers? Thanks

package javaapplication2;
import java.util.Scanner;
import java.lang.String;

public class JavaApplication2 {
    public static void main(String[] args) {

        // Creating an instance of the scanner class.
        // Gets name and numbers.
        Scanner getName = new Scanner(System.in);
        Scanner getNumber = new Scanner(System.in);

        //Holds name and number
        String userName;
        int userNumber;

        // Asks for the users name.
        // Holds name in userName.
        System.out.println("What is your name?");
        userName = getName.nextLine();

        //Reponds with the users name.
        System.out.println("Hello" + userName + "!");

        //Asks for favorite number.
        // Holds number in userNumber.
        System.out.println("What is your favorite number?");
        userNumber = getNumber.nextLine();

        // Checks if users number is larger than 6.
        if (userNumber > 6) {
            // Stuff goes here.
        }       
    }

}

Answer 1

You should use only one Scanner for one input stream:

Scanner in = new Scanner(System.in);

And after that you should use it's methods to get integers:

String name = in.nextLine();
int number = in.nextInt();

To be sure, you should read the documentation for Scanner :

1. Scanner
2. Scanner::nextLine
3. Scanner::nextInt

Answer 2

这可能会有所帮助： Scanner的Javadoc页面 。