Array index out of bounds error in 2d array during linear search

Question

I'm writing a program which is suppose to acting like a ticket finder. It displays a chart of possible seating choices along with their prices and asking if the user would like to select a seat by number or by price. It works like it's suppose to on the seat by number, but when I try to find a seat by price I get an array index out of bounds error. I'm confused because it's suppose to be starting a linear search there at zero. I don't understand why this error is there.

import java.util.Scanner;

public class FindTicket{
  public static void main(String[] args){
    String answer="number";
    Scanner kb=new Scanner(System.in);
    int[][] seats= {
      {10,10,10,10,10,10,10,10,10,10},
      {10,10,10,10,10,10,10,10,10,10},
      {10,10,10,10,10,10,10,10,10,10}, 
      {10,10,20,20,20,20,20,20,10,10}, 
      {10,10,20,20,20,20,20,20,10,10}, 
      {10,10,20,20,20,20,20,20,10,10}, 
      {20,20,30,40,40,40,30,30,20,20}, 
      {20,30,30,40,50,50,40,30,30,20},
      {30,40,50,50,50,50,50,50,40,30}
    };

    printChart(seats);
    do{
      System.out.println("Would you like to choose a seat by number, price, or quit?");
      answer = kb.nextLine();
      if(answer.equals("price")){
        sellSeatbyPrice(seats);}
      if(answer.equals("number")){ 
        sellSeatbyNumber(seats);}
      printChart(seats);
    }while(!answer.equals("quit"));
  }

  public static void printChart(int[][] seats){
    for (int i=0; i<seats.length; i++)
    {
      for(int j=0; j<seats[0].length; j++)
      {
        System.out.printf("%8d", seats[i][j]);
      }
      System.out.println();
    }
  }

  public static int[][] sellSeatbyPrice(int[][] seats){
    Scanner kb=new Scanner(System.in);
    int ticketprice;
    int row = 0, col = 0;
    boolean found = false, seatavaliable=true;
    do{
      System.out.println("What is your prefered ticket price?");
      ticketprice=kb.nextInt();
      while (row<seats.length && !found){
        do{
          if(seats[row][col] == ticketprice){
            found = true;}
          else{
            col++; }  
        }while(col<seats[0].length &&!found);
        if(seats[row][col] == ticketprice){
          found = true;}
        else{
          row++;} 
      }
      if(found){
        seats[row][col] = 0; }
      else {
        System.out.println("Seat not found at specified price.");
        seatavaliable=false;}
    }while(seatavaliable==false);

    return seats;
  }

  public static int[][] sellSeatbyNumber(int[][] seats){
    Scanner kb=new Scanner(System.in);
    int row = 0, col = 0;
    int editedrow, editedcol;
    boolean seatavaliable = true;
    do{
      System.out.println("What is your prefered seat number?  Please enter row then column.");
      row=kb.nextInt();
      col=kb.nextInt();
      editedrow = 9-row;
      editedcol = col - 1;
      if(seats[editedrow][editedcol] > 0){
        seats[editedrow][editedcol] = 0;}
      else{
        System.out.println("Seat is not avaliable.");
        seatavaliable=false;}
    }while(seatavaliable==false);

    return seats;
  }

}

Answer 1

It's because of do...while.

When this block of code is done, col will be greater than the length of your array.

Look at the comments:

public static int[][] sellSeatbyPrice(int[][] seats){
    Scanner kb=new Scanner(System.in);
    int ticketprice;
    int row = 0, col = 0;
    boolean found = false, seatavaliable=true;
    do{
      System.out.println("What is your prefered ticket price?");
      ticketprice=kb.nextInt();
      while (row<seats.length && !found){
        do{
          if(seats[row][col] == ticketprice){
            found = true;}
          else{
            col++; }  // this line, in the last iteration, will make col=seats[0].length
        }while(col<seats[0].length &&!found);
        if(seats[row][col] == ticketprice){ //col with value greater than it should.
          found = true;}
        else{
          row++;} 
      }
      if(found){
        seats[row][col] = 0; }
      else {
        System.out.println("Seat not found at specified price.");
        seatavaliable=false;}
    }while(seatavaliable==false);

    return seats;
  }