CODEWITHSUNDEEP
javaexceptionjava.util.scanner
Sam Venturina
Sam Venturina

Reputation: 21

Exception in thread "main" java.util.NoSuchElementException on my code?

What did i do wrong??

The errors are:

Exception in thread "main" java.util.NoSuchElementException
at java.util.Scanner.throwFor(Scanner.java:862)
at java.util.Scanner.next(Scanner.java:1485)
at java.util.Scanner.nextInt(Scanner.java:2117)
at java.util.Scanner.nextInt(Scanner.java:2076)
at MyClass.main(MyClass.java:14)

Here is the code:

import java.util.Scanner;
import java.util.Random;
public class MyClass {
public static Scanner scan = new Scanner(System.in);
public static void main(String args[]) {
    int person,ai,aiint;
    Scanner scan = new Scanner(System.in);
     Random rand = new Random(); 

   System.out.println("Let's Play rock paper scissors! press 1 for rock 2 for paper 3 for scissors ");
   System.out.println();
   aiint=rand.nextInt(3)+1;
   System.out.println("Enter your play: ");
    person=scan.nextInt();
    System.out.println("Computer play is: " +aiint);
    System.out.println("Your play is:" +person);
    if (person==aiint) {
        System.out.println("It's a tie!");
    }
    else if (person==1){
            if(aiint==2){
                System.out.println("Paper beats rock, you lose!");
            }
            else if(aiint==3){
                System.out.println("Rock beats scissors, you win!");
            }
        }
    else if (person==2){
            if(aiint==1){
                System.out.println("Paper beats rock, you win!");
            }
            else if (aiint==3){
                System.out.println("Scissors beats paper, you lose!");
            }
        }
    else if (person==3){
        if(aiint==1){
            System.out.println("Rock beats scissors, you lose!");
        }
        else if(aiint==2){
            System.out.println("Scissors beats paper. you win!");
        }
    }    
    }
}

Upvotes: 1

Views: 4020

Answers (1)

Nabin Bhandari
Nabin Bhandari

Reputation: 16379

Your code is working fine.

But since you mentioned NoSuchElementException, it is thrown when you try to read something form the Scanner but the Scanner do not have anything to be read.

From documentation of Scanner#nextInt()

@throws NoSuchElementException if input is exhausted

To prevent it you should check whether any element exists in the Scanner:

if(scan.hasNextInt()){
    person = scan.nextInt();
} else {
    //show error
    return;
}

Upvotes: 1

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