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Using two methods to get multiple user inputs in Java

I am working on some basic java skills are I am getting a NoSuchElementExemption when I am debugging. My goal is to ask two questions in two different methods and combine them in the main function. Could someone explain the rule that I am breaking?

The code is as follows:

import java.util.Scanner;

public class TwoInputs{

public static double test()
{
Scanner reader2 = new Scanner(System.in);
System.out.println("Enter a number ");

double n2 = reader2.nextDouble();
if (n2 %1 != 0) {
System.out.println("Number is invalid");

} else {
reader2.close();
System.out.println("You put the number " + n2);
}
return n2;
}

public static double test2()
{
Scanner reader1 = new Scanner(System.in);
System.out.println("Enter a number ");

double n1 = reader1.nextInt();
if (n1 %1 != 0) {
System.out.println("Number is invalid");

} else {
reader1.close();
System.out.println("You put the number " + n1);
}
return n1;
}

public static void main(String args) {

double sum = test();
double sum2 = test2();
System.out.println("You put the number " + sum+ "and"+ sum2);

}
}


1 Answer
1

I think by closing the reader, the inputstream will be closed, too. I.e. you can not open an other Scanner with System.in. Try it this way:

import java.util.Scanner;

public class Main {
public static double test(Scanner scanner)
{
System.out.println("Enter a number ");

double n2 = scanner.nextDouble();
if (n2 %1 != 0) {
System.out.println("Number is invalid");

} else {
System.out.println("You put the number " + n2);
}
return n2;
}

public static double test2(Scanner scanner)
{
System.out.println("Enter a number ");
double n1 = scanner.nextInt();
if (n1 %1 != 0) {
System.out.println("Number is invalid");

} else {
System.out.println("You put the number " + n1);
}
return n1;
}

public static void main(String args) {

Scanner scanner = new Scanner(System.in);
double sum = test(scanner);
double sum2 = test2(scanner);
System.out.println("You put the number " + sum+ "and"+ sum2);

}
}


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