Why does this error Exception in thread "main" java.util.NoSuchElementException:

Question

I've been stuck with this error anybody can figure this out? I keep getting an error right away. I'm thinking it is a simple fix, but I can't figure it out. I've been fixing this a while and I don't know where. Thank you for you help.

import java.util.Scanner;

public class Menu {
    boolean exit;
    public static void main(String[] args){
        
        Menu menu = new Menu();
        menu.runMenu();
   
    }
    
    public void runMenu(){
        printHeader();
        while(!exit){
            printMenu();
            int choice = getInput();
            performAction(choice);
        }
    }
    
    private void printHeader(){
        System.out.println("+----------------------------+");
        System.out.println("|     Area Plane of Shape    |");
        System.out.println("+----------------------------+");
    }
    
    private void printMenu(){
        System.out.println(" ");
        System.out.println("Please make selection: ");
        System.out.println(" ");
        System.out.println("1) Area of the Square");
        System.out.println("2) Area of the Rectangle");
        System.out.println("3) Area of the Triangle");
        System.out.println("4) Area of the Circle");
        System.out.println("0) Exit");
    }

    private int getInput(){
        Scanner input = new Scanner(System.in);
        int choice = -1;
        do{
            System.out.println(" ");
            System.out.println("Enter your choice: ");
            try {    
                choice = Integer.parseInt(input.nextLine());
            } catch(NumberFormatException e){
                System.out.println("Invalid Selection. Please try again.");
            }
        }while(choice < 0 || choice > 4);     
        return choice;
        //return 1;
        }
         
    private void performAction(int choice){
        switch(choice){
            case 0:
                exit = true;
                System.out.println("Thank you for using my application.");
                break;
            case 1:
                areaofSquare();
                break;
            case 2:
                areaofRectangle();
                break;
            case 3:
                areaofTriangle();
                break;
            case 4:
                areaofCircle();
                break;
            default:
                System.out.println("Invalid");
        }
    }
  
    private void areaofSquare(){
        System.out.println("+----------------------------+");
        System.out.println("|   **Area of the Square**   |");
        System.out.println("+----------------------------+");
        System.out.println(" ");
        try (Scanner scanner = new Scanner(System.in)) {
            System.out.println("Enter Side of Square: ");
            // Storing the captured value in a variable
            double side = scanner.nextDouble();
            // Area of Square = side*side
            double area = side * side;
            System.out.println("Area of Square is: " + area);
        }    
    }
    
    private void areaofRectangle(){
        System.out.println("+----------------------------+");
        System.out.println("|  **Area of the Rectangle** |");
        System.out.println("+----------------------------+");
        System.out.println(" ");
         try (Scanner scanner = new Scanner(System.in)) {
            System.out.println("Enter the length of Rectangle:");
            double length = scanner.nextDouble();
            System.out.println("Enter the width of Rectangle:");
            double width = scanner.nextDouble();
            // Area = length*width;
            double area = length * width;
            System.out.println("Area of Rectangle is: " + area);
            
         }
    }
    
    private void areaofTriangle(){
        System.out.println("+----------------------------+");
        System.out.println("|  **Area of the Triangle**  |");
        System.out.println("+----------------------------+");
        System.out.println(" ");
         try (Scanner scanner = new Scanner(System.in)) {
            System.out.println("Enter the width of the Triangle:");
            double base = scanner.nextDouble();

            System.out.println("Enter the height of the Triangle:");
            double height = scanner.nextDouble();

            // Area = (width*height)/2
            double area = (base * height) / 2;
            System.out.println("Area of Triangle is: " + area);
            
         }
    }
    
    private void areaofCircle(){
        System.out.println("+----------------------------+");
        System.out.println("|   **Area of the Circle**   |");
        System.out.println("+----------------------------+");
        System.out.println(" ");
        try(Scanner scanner = new Scanner(System.in)) {
        System.out.println("Enter the radius:");
         double r= scanner.nextDouble();
         double  area=(22*r*r)/7 ;
         System.out.println("Area of Circle is: " + area);
         
        }
    }
}

I've gone through research the error reports and the Java-docs and finding reports with similar problems. Please help.

I get this error

Exception in thread "main" java.util.NoSuchElementException: No line found
    at java.base/java.util.Scanner.nextLine(Scanner.java:1651)
    at Menu.getInput(Menu.java:50)
    at Menu.runMenu(Menu.java:20)
    at Menu.main(Menu.java:9)
Command execution failed.

This might help you - https://stackoverflow.com/questions/5032356/using-scanner-nextline — D George, Dec 10 '20 at 04:30

score 0 · Answer 1 · answered Dec 10 '20 at 04:25

0

In your getInput method, you are trying to call input.nextLine() and there is no next line, hence "no line found" in the error message. Try using an if (input.hasNextLine()) around the input.nextLine() to check if its there first.

answered Dec 10 '20 at 04:25

bdehmer

503
1
3
15

score 0 · Answer 2 · answered Dec 10 '20 at 05:21

Here is the code with fixes: you have not used scanner properly.

import javassist.bytecode.stackmap.BasicBlock;

import java.util.Scanner;

public class Menu {
    boolean exit;
    public static void main(String[] args){

        Menu menu = new Menu();
        menu.runMenu();

    }

    public void runMenu(){
        printHeader();
        while(!exit){
            printMenu();
            int choice = getInput();
            performAction(choice);
        }
    }

    private void printHeader(){
        System.out.println("+----------------------------+");
        System.out.println("|     Area Plane of Shape    |");
        System.out.println("+----------------------------+");
    }

    private void printMenu(){
        System.out.println(" ");
        System.out.println("Please make selection: ");
        System.out.println(" ");
        System.out.println("1) Area of the Square");
        System.out.println("2) Area of the Rectangle");
        System.out.println("3) Area of the Triangle");
        System.out.println("4) Area of the Circle");
        System.out.println("0) Exit");
    }

    private int getInput(){

        int choice = -1;
        do{
            Scanner input = new Scanner(System.in);
            System.out.println(" ");
            System.out.println("Enter your choice: ");
            try {
                choice = Integer.parseInt(input.nextLine());
            } catch(NumberFormatException e){
                System.out.println("Invalid Selection. Please try again.");
            }
        }while(choice < 0 || choice > 4);

        return choice;
        //return 1;
    }

    private void performAction(int choice){
        switch(choice){
            case 0:
                exit = true;
                System.out.println("Thank you for using my application.");
                break;
            case 1:
                areaofSquare();
                break;
            case 2:
                areaofRectangle();
                break;
            case 3:
                areaofTriangle();
                break;
            case 4:
                areaofCircle();
                break;
            default:
                System.out.println("Invalid");
        }
    }

    private void areaofSquare(){
        System.out.println("+----------------------------+");
        System.out.println("|   **Area of the Square**   |");
        System.out.println("+----------------------------+");
        System.out.println(" ");
        Scanner scanner = new Scanner(System.in);
        try  {

            System.out.println("Enter Side of Square: ");
            // Storing the captured value in a variable
            double side = scanner.nextDouble();
            // Area of Square = side*side
            double area = side * side;
            System.out.println("Area of Square is: " + area);
        }catch (Exception e){
            scanner.close();
        }
    }

    private void areaofRectangle(){
        System.out.println("+----------------------------+");
        System.out.println("|  **Area of the Rectangle** |");
        System.out.println("+----------------------------+");
        System.out.println(" ");
        Scanner scanner = new Scanner(System.in);
        try {
            System.out.println("Enter the length of Rectangle:");
            double length = scanner.nextDouble();
            System.out.println("Enter the width of Rectangle:");
            double width = scanner.nextDouble();
            // Area = length*width;
            double area = length * width;
            System.out.println("Area of Rectangle is: " + area);

        }catch (Exception e){
            scanner.close();
        }
    }

    private void areaofTriangle(){
        System.out.println("+----------------------------+");
        System.out.println("|  **Area of the Triangle**  |");
        System.out.println("+----------------------------+");
        System.out.println(" ");
        Scanner scanner = new Scanner(System.in);
        try {
            System.out.println("Enter the width of the Triangle:");
            double base = scanner.nextDouble();

            System.out.println("Enter the height of the Triangle:");
            double height = scanner.nextDouble();

            // Area = (width*height)/2
            double area = (base * height) / 2;
            System.out.println("Area of Triangle is: " + area);

        } catch (Exception e){
            scanner.close();
        }
    }

    private void areaofCircle(){
        System.out.println("+----------------------------+");
        System.out.println("|   **Area of the Circle**   |");
        System.out.println("+----------------------------+");
        System.out.println(" ");
        Scanner scanner = new Scanner(System.in);
        try {
            System.out.println("Enter the radius:");
            double r= scanner.nextDouble();
            double  area=(22*r*r)/7 ;
            System.out.println("Area of Circle is: " + area);

        }catch (Exception e){
            scanner.close();
        }
    }
}

Why does this error Exception in thread "main" java.util.NoSuchElementException:

2 Answers2