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AR Aljanabi
Front End Web Development Techdegree Student 10,794 Pointsstuck in the jar game android
when i run the project, it gives me that message: "Exception in thread "main" java.lang.NullPointerException at Game.main(Game.java:15)" So what should i do?? that's my code in java....
import java.io.Console;
import java.util.Scanner;
import java.util.Random;
public class Game {
public static void main(String[] args) {
// TODO Auto-generated method stub
int number = 0;
System.out.println("ADMINISTRATOR SETUP");
System.out.println("======================");
Console console = System.console();
Scanner in = new Scanner(System.in);
String nameOfItem = console.readLine("Name of items in the jar: ");
System.out.printf("Maximum number of %s in the jar: ", nameOfItem);
int numberOfItem = in.nextInt();
Random random = new Random();
int randomNumber = random.nextInt() + 1;
System.out.println("");
System.out.println("Player");
System.out.println("======================");
System.out.println("Your goal is to guess how many"+ nameOfItem +"are in the jar. Your guess sould be between 1 and " + numberOfItem);
System.out.println("");
System.out.println("Ready? ");
System.out.println("");
int guessedNumber;
do {
guessedNumber = in.nextInt();
System.out.printf("Guess: %d", guessedNumber);
number += 1;
} while(guessedNumber != randomNumber);
if (guessedNumber == randomNumber){
guessedNumber = randomNumber;
}
System.out.println("Congradulations - you guessed that there are"+ guessedNumber +" "+ nameOfItem +" in the jar! It took you "+ number +" guess(es) to get it right.");
}
}
1 Answer
Kristian Gausel
14,661 PointsI think your problem is from mixing console.readline and the scanner. The scanner probably never consumed the input from the readline. Java is not too simple when it comes to console input.