Java Error after program runs -

my program want do, after it's done running error pops up. looking through code cannot find error occurs.

exception in thread "main" java.lang.illegalstateexception: scanner closed @ java.util.scanner.ensureopen(scanner.java:1070) @ java.util.scanner.next(scanner.java:1465) @ java.util.scanner.nextint(scanner.java:2117) @ java.util.scanner.nextint(scanner.java:2076) @ simplestatistics.simplestatistics.main(simplestatistics.java:102) 

input -> java result: 1 package simplestatistics;

import java.util.*; import java.lang.*; import java.util.inputmismatchexception;  public class simplestatistics {  public static double[] getuserinput(scanner sc) {      list<double> inputlist = new arraylist<double>();      system.out.println("please enter how many numbers inputing");     int numberofinputs = sc.nextint();      (int = 0; < numberofinputs; i++) {         system.out.println("please enter number");         double userinput = sc.nextdouble();         inputlist.add(userinput);     }     sc.close();      double[] arr = new double[inputlist.size()];     (int = 0; < arr.length; i++) {         arr[i] = inputlist.get(i);     }     return arr; }  public static double arithmeticmean(double[] nums) {      double mean = 0;     double sum = 0;      (int = 0; < nums.length; i++) {         sum = sum + nums[i];     }     mean = sum / nums.length;      return mean; }  public static double geometricmean(double[] nums) {      double gm = 1.0;     (int = 0; < nums.length; i++) {         gm *= nums[i];     }     gm = math.pow(gm, 1.0 / (double) nums.length);     return gm; }  public static double[] minandmax(double[] nums) {      double min = nums[0];     double max = nums[0];      (int = 1; < nums.length; i++) {         if (nums[i] < min) {             min = nums[i];         } else if (nums[i] > max) {             max = nums[i];         } else {          }     }      double[] minandmax = {min, max};     return minandmax; }  public static double[] scaleup(double[] nums, int factor) {      (int = 0; < nums.length; i++) {         nums[i] *= factor;     }     return nums; }  public static double[] scaledown(double[] nums, int factor) {      (int = 0; < nums.length; i++) {         nums[i] /= factor;     }     return nums; }  public static void main(string[] args) {     scanner sc = new scanner(system.in);      double[] input = {1, 2.8, 5.3, 100, -5, -6.5};      system.out.println("choose option 1-6");      boolean exit = false;     while (!exit) {         system.out.println();         system.out.println("1) arithmetic mean, 2) geometric mean, 3)  minandmax, 4)  scale up, 5)  scale down, 6)  quit");         system.out.print("input -> ");         int choice = sc.nextint();         system.out.println();          switch (choice) {             case 1: {                 // arithmetic mean                 system.out.println("arithmetic mean");                 system.out.println(arithmeticmean(getuserinput(sc)));                 break;             }             case 2: {                 // geometric mean                 system.out.println("geometric mean");                 system.out.println(arithmeticmean(getuserinput(sc)));                 break;             }             case 3: {                 // min , max                 system.out.println("min , max");                 (double : minandmax(getuserinput(sc))) {                     system.out.print(i + ", ");                 }                 break;             }             case 4: {                 // scale                 system.out.println("scale up");                 system.out.print("please enter factor want scale -> ");                 int factor = sc.nextint();                 (double : scaleup(input, factor)) {                     system.out.print(i + ", ");                 }                 break;             }              case 5: {                 // scale down                 system.out.println("scale down");                 system.out.print("please enter factor want scale -> ");                 int factor = sc.nextint();                 (double : scaledown(input, factor)) {                     system.out.print(i + ", ");                 }                 break;             }              case 6: {                 exit = true;                 break;             }          }     } } 

}

here's link code

https://gist.github.com/chunky1022/0775fba6692456ae1c8c#file-gistfile1-txt

at first call of getuserinput close scanner.

public static double[] getuserinput(scanner sc) {      ...      sc.close();      ... } 

simply remove sc.close line.

if want close it, close when sure won't use scanner anymore. however, don't see why close system.in.