Thread: It won't display the invalid selection part

Hello I have a problem in my coding. This coding is a Quiz Game creator. Lets say I want to create 3 question in this game.
and when the game starts.. it will display the 3 question.

So at that selection of question I chose to do Number 5 when it only has 3. It should have displayed a message saying Invalid selection please try again. But instead the program display a Question 5 but with null data.

How can I make my program display that message? It doesnt seem to work when I try the IF statement it tends to skip that if statement or I typed something wrong but I don't see where it is.

 
/**
 * Write a description of class QuizGamePA3 here.
 * 
 * @author (your name) 
 * @version (a version number or a date)
 */
import java.util.*;
import java.io.*;
import java.util.Scanner;
public class QuizGamePA3
{
  public static void main(String[]args ) throws FileNotFoundException
{  
    Scanner input = new Scanner (System.in);
 
     String s = " ";
 
    int[] choice,answer,pick,pick2,numbers;
    choice = new int[5000];
    answer = new int[5000];
    numbers= new int[5000];
    pick = new int[5000];
    pick2= new int[5000];
     int alt = 1;
 
    String[] data,category,option,option2,option3,option4;
    data = new String[5000];
    category = new String[5000];
    option = new String[5000];
    option2= new String[5000];
    option3= new String[5000];
    option4= new String[5000];
 
    int Point=0;
 
    System.out.printf("\n%10s Welcome to Quiz Game Creator \n\n",s);
    System.out.printf("%16s How to do it?%n",s);
    System.out.printf("1] Specify number of question you want to do.\n");
    System.out.printf("2] Create the question CATEGORY\n");
    System.out.printf("3] Enter the QUESTION for each category.\n");
    System.out.printf("4] Enter the OPTION for each question.\n");
    System.out.printf("5] Provide the ANSWER for each question.\n");
    System.out.printf("6] Then your QUIZ GAME is ready to be play by your friends\n");
    System.out.println();
    System.out.println("-----------------------------------------------");
    System.out.println("Press the ENTER key to start creating the Quiz"); 
    System.out.println("-----------------------------------------------");
    input.nextLine();
 
    System.out.printf("\nHow many questions you want to create: ");
    choice[1] = input.nextInt(); // Input of how many questions to create
    System.out.println();
 
    System.out.print('\u000C'); 
    input.nextLine();
    System.out.println();
    System.out.println(" Please enter your question CATEGORY");
 
    for(int a=1; a<=choice[1];a++){
 
       System.out.print(numbers[1]+1+ "] ");
       data[a]=input.nextLine();
       numbers[1]++;       
 
      }
    System.out.print('\u000C'); 
    System.out.println();
    System.out.println(" Please enter your QUESTION");
 
    for(int b=1; b<=choice[1];b++){
       System.out.println();    
       System.out.println("Category: " +data[b]);
       System.out.printf(choice[3]+1+"] ");
       category[b] = input.nextLine();// Input of the questions for certain category
       choice[3]=choice[3]+1;
        }
    System.out.print('\u000C'); 
    System.out.println(); 
    System.out.println("Please enter your question OPTION");
 
    for(int c = 1; c<=choice[1];c++){
 
      System.out.println();
      System.out.println("Question : "+category[c]);// Storing of 4 options for each questions
      System.out.println();
 
      System.out.printf("1] ");
      option[c] = input.nextLine();
 
      System.out.printf("2] ");
      option2[c] = input.nextLine();
 
      System.out.printf("3] ");
      option3[c] = input.nextLine();
 
      System.out.printf("4] ");
      option4[c] = input.nextLine();  
 
      System.out.println();
      System.out.println("Please Set the answer to this question");
      System.out.print("The answer is: ");
      answer[c] = input.nextInt();// Chosen answer for each questions.
      input.nextLine();
      System.out.println();
     }
     System.out.println("Your Quiz Game is now READY. Press the ENTER key to start...");
     input.nextLine();
     System.out.print('\u000C'); 
 
     System.out.printf("%15s Welcome to the QUIZ GAME\n\n",s);
     System.out.printf("%8s Game Rule: 1] Select one topic.\n",s);
     System.out.printf("%18s 2] Answer the MCQ question.\n",s);
     System.out.printf("%18s 3] Each correct answer will be awarded 10 points.\n",s);
     System.out.printf("%18s 4] Each incorrect answer will be deducted 10 points.\n",s);
     System.out.printf("%18s 5] The game will be over once you answer the question wrongly.\n",s);
     System.out.println();
     System.out.printf("%10s Press the ENTER key to start the game...\n",s);
     input.nextLine();
     System.out.print('\u000C'); 
 
 
     for(int z=1; z<=choice[1];z++){
 
      System.out.println(" Your current point is: "+Point); // game currency
     for(int d=1; d<=choice[1];d++){
 
        System.out.println((d)+ "] "+data[d]);// display the categories of the questions
 
        }
       System.out.print("Please select question topic : ");
       pick[z]=input.nextInt();// This is where the user choose which category to answer
 
 
        if (pick2[z] > choice[1]) {
        System.out.println();
        System.out.println("Invalid number. Please re-select your selection");
        System.out.println();
 
         } 
      else if(pick2[z] <= choice[1]) {
          System.out.println("--------------------------------------");
            System.out.println();
        System.out.println("Category: "+data[pick[z]]);
        System.out.println("Question: "+ category[pick[z]]);
        System.out.println();
        System.out.println("1] "+option[pick[z]]);
        System.out.println("2] "+option2[pick[z]]);
        System.out.println("3] "+option3[pick[z]]);
        System.out.println("4] "+option4[pick[z]]);
        System.out.print("What is your answer: ");
        pick2[z]=input.nextInt();
          if (pick2[z] == answer[pick[z]]){
         Point=Point + 10;
         System.out.println();
         System.out.println("Your answer is correct! You earn 10 Points");
         System.out.println();
         System.out.println("------------------------------------------");
 
        }
 
        else{ 
          System.out.print('\u000C'); 
          Point=Point-10;
          System.out.println();
          System.out.println("Your answer is WRONG!");
          System.out.println("      GAME OVER!");
          System.out.println();
          System.out.println("Your final point is :"+Point+" Point");
          System.out.println();
          System.out.println(" Thanks your for playing");
          input.nextLine();
          System.exit(0);
        }
      } 
 
    }
  }
}

Originally Posted by Norm

There may be a problem using the Scannet class's methods. See this: Java Scanner not working, difference between next() and nextLine() | Rommel Rico

Sorry norm get rid of the System.out.print('\u000C');
Im using BlueJ

Originally Posted by Chris.Brown.SPE

Could you give some sample input/output so we can see how you got to the point of the error in your code?

here..
output.jpg

ah i see that's what i did wrong... no wonder it wont run as i wanted it to be.. thx for help.~ i had 2 pick var... it works fine now. thanks again.

Originally Posted by Norm

Could you explain how::

System.out.print('\u000C');

Fixes the Scanner problem
and provide a link to where you found that technique?

Other students can probably use that technique.

System.out.print('\u000C');

umm the code is just part of the coding inside Bluej that allows the user to clearscreen. I read it online here.

Bluej for ICSE Schools: Clearing the terminal