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Thread: Stuck and can't get past it!

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    Default Stuck on 1D array problem!

    Hello everyone,

    I'm currently working on a java problem that does the following;
    1. There will be method getOn(String name).
    2. Method int findFirstEmpty() will find first empty seat. <-where it puts name in array
    3. print() //print all occupied seats.
    4. getOff(String name) //bus stops and kid leaves.
    5. swap(String name1, String name2) //if some kid misbehaves the driver will make him swap seats.
    6. In the main method submit with the following operations.
    7. anna comes in and finds first empty seat
    8. nancy comes in and finds first empty seat
    9. erica comes in and finds first empty seat
    10. karen comes in and finds first empty seat
    11. joe comes in and finds first empty seat
    12. print all //print message what you are printing "after loading kids"
    13. swap nancy and karen
    14. print all // print message what you are printing "after swapping kids"
    15. bus stops, erica leaves.
    16. bus stops, nancy leaves.
    17. Print all. //announce what you are printing "after nancy left"
    18. Bus stops, new kid (mike) is standing on the corner wants to take a ride, so give him first available seat in the bus.
    19. Print all in the above format. //announce what you are printing "after mike came on"


    It is a 1-d array with the size of 10 (representing 10 seats on a bus). I have to place each child in the first available seat, hence the findFirstEmpty function. The problem I'm having is mainly with the getOn portion and the findFirstEmpty portion;

     
    package schoolbus;  
    import java.util.*;
    import java.io.*;
     
    public class SchoolBus 
    {
     
        //Declare array for the schoolbus to use
        private String[] names = new String[10];
     
        /*
         * Description: This method sets the array to null, which will indicate where
         *              empty seats are later on.
         * Precondition: The array must have already been created.
         * Postcondition: The array will be filled with null.
         */
        public SchoolBus()
        {
            String names[] = null;
        }
     
        /*
         * Description: This method will allow the children to get on the bus and work with
         *              findFirstEmpty to place them in the first available seat.
         * Precondition: The bus array must already exist and have been set to null.
         * Postcondition:  The child will reside in the array (on the bus).
         */
        public void getOn(String name)
        {
            //Read the name into the method.
     
            //Use the findFirstEmpty to locate the first null seat and fill it.
            name.findFirstEmpty();
     
            //Return the seat with child in it.
     
     
        }
     
         /**
         * Description: This method will search for the first empty spot in the array 
         *  (the bus) and place the 'child' in that empty seat.
         * Precondition: The bus array must already exist and there must be at least
         *  one child on the bus.
         * Postcondition: There will now be one less empty spot since a 'child' will 
         *  be residing in the formerly empty location.
         */
        public int findFirstEmpty()
        {
             //Where it puts the name into the array
     
            //If there is nobody in the seat, put the child in that seat.
            String n;
            for (int i = 0; i < 100; i++)
    	{
    		if (names[i] != null)
    		{
    			n = names[i];
                            n.getOn(names);
     
    		}
                    else
                    {
     
                    }
    	}
            return names;
     
     
            //create string 'empty' and search for that
        }
     
     
        /**
         * Description: This method will print all of the occupied seats.
         * Precondition: The bus array must already exst and there must be at least
         *  one child on the bus.
         * Postcondition:  There will be a printout of all of the occupied seats and
         *  who is occupying them.
         */
        public void print()
        {
     
     
            //Print out the array and the position of the item in the array.
            for (int i = 0; i < names.length; i++)
            {
               if (names[i] != null)
               {
                   System.out.println();
               }
               else
               {
     
               }
            }
     
        }
     
     
        /**
         * Description: This method is when the bus stops and a child gets off, 
         *  freeing up a seat.
         * Precondition: The bus array must already exist and there must be at least
         *  one child on the bus.
         * Postcondition: There will be one more empty spot since the child that was
         *  residing in that spot got off at the bus stop.
         */
        public void getOff(String name)
        {
     
             //Change the child's name to 'empty' to signify their leaving the bus.
        }
     
     
        /**
         * Description: This method is used for when a 'child' is being too roudy and 
         *  has to switch seats with another to calm them down.
         * Precondition: The bus array must alraedy exist and there must be at least 
         *  two children on the bus.
         * Postcondition: The 'children' who were chosen for the swap will be 
         *  located in different seats.
         */
        public void swap(String name1, String name2)
        {
     
            String temp = name1;
            name1 = name2;
            name2 = temp;       
        }
     
        public static void main(String[] args) 
        {
            // initialize schoolbus class
     
            System.out.println("The bus pulls up and the children load onto it.");
     
            SchoolBus n1 = new SchoolBus();
     
     
            //Anna enters bus and sits in the first empty seat
     
     
            //Nancy enters the bus and sits in the first empty seat.
     
     
            //Erica enters the bus and sits in the first empty seat
     
     
            //Karen enters the bus and sits in the first empty seat.
     
            //Joe enters the bus and sits in the first empty seat.
     
     
            /**
            * Print the bus with the children in it, include the message "after 
            * loading kids, this is what the bus contains"
            */
            System.out.print("After loading the children onto the bus, this is who the bus contains: ");
     
            //Swap Nancy and Karen
     
     
            /**
            * Print the bus with the children in it, include the message "after 
            * swapping the children, this is what the bus contains"
            */
            System.out.print("After swapping Nancy and Karen's seats, this is what remains on the bus: ");
            System.out.println();
     
            //Erica exits the bus at her stop
     
     
            //Nancy exits the bus at her stop
     
     
            /**
            * Print the bus with the children in it, include the message "after 
            * Nancy left, this is what the bus contains" 
            * ASK IF WE NEED TO TYPE AFTER ERICA LEFT!!!!
            */
            System.out.print("After Nancy and Erica exited the bus, this is who remains: ");
            System.out.println();
     
            //New child, Mike, enters bus and takes the first available seat.
     
     
            /**
            * Print the bus with the children in it, include the message "after Mike
            * enters the bus, this is what the bus contains"
            */
            System.out.print("After Mike enters the bus, this is who the bus contains: ");
            System.out.println();
        }
    }

    I would really appreciate a nudge in the right direction, or an example of something similar(I learn well from related examples) Thank you all so much in advanced! I really just want to understand how this works!
    Last edited by Wonderlandslost; February 12th, 2012 at 12:59 AM.


  2. #2
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    Default Re: Stuck and can't get past it!

    do you get a NullPointer exception?

    as i look into your code, your SchoolBuss class Constructor sets the name array into null again, is that the problem you get?

    i mean this
    public SchoolBus()
        {
            String names[] = null;
        }
    Last edited by chronoz13; February 11th, 2012 at 02:08 AM.

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    Default Re: Stuck and can't get past it!

    You have two variables defined with the name: names
    One at the class level and one in the constructor.
    They should have different names or you should get rid of one of the definitions (remove the String[] part)

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    Default Re: Stuck and can't get past it!

    Quote Originally Posted by chronoz13 View Post
    do you get a NullPointer exception?

    as i look into your code, your SchoolBuss class Constructor sets the name array into null again, is that the problem you get?

    i mean this
    public SchoolBus()
        {
            String names[] = null;
        }
    Honestly, I haven't run the code yet, since I don't feel I have enough to do so. I am confused on that part though, which is why I added that. I know that I need some sort of array to hold the child's name as well as the seat number (since I need to print both; "0, Bob"), but I'm not sure how to indicate that the seat is empty. When my instructor did a small example, he ran his program by setting the array to null, like that, but I'm not sure what that does and why. So, would I need to do that, or is it set to null as is? I'm sorry if I sound ignorant, I just struggle with arrays. Stacks, queues, binary search trees...all those I understand, arrays; not so much. Thank you very much for such fast help! I really appreciate your taking the time to respond and assist me.

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    Default Re: Stuck and can't get past it!

    Quote Originally Posted by Norm View Post
    You have two variables defined with the name: names
    One at the class level and one in the constructor.
    They should have different names or you should get rid of one of the definitions (remove the String[] part)
    So, I'm assuming that you're referencing the beginning, correct? I've tried that, but I'm not sure if I did it right. Also, once I have that array, how do I got about using it? I'm really unsure, arrays are definitely not my thing.

    Below is a snippet with the change I made. I'm getting an error in public SchoolBus stating that a ';' is expected. By the way, thank you so much for helping and helping so quickly too! I really appreciate any ounce of help I can get!
     
    public class SchoolBus 
    {
     
        //Declare array for the schoolbus to use
        String names[] = new String[10];
     
        /*
         * Description: This method sets the array to null, which will indicate where
         *              empty seats are later on.
         * Precondition: The array must have already been created.
         * Postcondition: The array will be filled with null.
         */
        public SchoolBus()
        {
            names[] = null;
        }

    Edit: reread this after I posted and realized that it sounded somewhat like I was asking you to do it, I didn't mean it that way. I just don't understand why it's doing that nor what I should try to do to even go about fixing it (working on it now regardless). I find that getting explanations from someone who knows the information really well helps me look at it and figure out what to do. Thank you again!
    Last edited by Wonderlandslost; February 12th, 2012 at 12:53 AM.

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    Default Re: Stuck and can't get past it!

    Your logic does not make sense. You define an array: names and give it a value of 10 elements: String[10] and then immediately change its value to null. Why?
    You could set its value to null define it: String[] names = null;
    Most people code the [] with the data type not with the variable name.

    In the constructor the syntax of your assignment statement is wrong. Leave off the []:
    names = null;

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    Default Re: Stuck and can't get past it!

    Quote Originally Posted by Norm View Post
    Your logic does not make sense. You define an array: names and give it a value of 10 elements: String[10] and then immediately change its value to null. Why?
    You could set its value to null define it: String[] names = null;
    Most people code the [] with the data type not with the variable name.

    In the constructor the syntax of your assignment statement is wrong. Leave off the []:
    names = null;
    Okay, I see that, however in my class, they said you had to declare the array and then set it to null in order to find the empty seats and fill them. According the instructions I was given, it has to be a array of [10], hence why I set it to that. So, by declaring it in general as such, would it automatically be set to null or would I have to do something in order to do so? I'm sorry if the question seems silly, I'm just confused on what to do, since a lot of the things explained in class aren't working in real life application.

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    Default Re: Stuck and can't get past it!

    When you define an array of objects like String, it will initially contain null values. In your code, the names array will contain 10 null values when it is defined.

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    Default Re: Stuck and can't get past it!

    Quote Originally Posted by Norm View Post
    When you define an array of objects like String, it will initially contain null values. In your code, the names array will contain 10 null values when it is defined.
    Oh! Okay, that makes a lot more sense. Thank you so much! So I don't actually need to set it to null since it's already set to null. Now since it's set to null already, when I'm working with my firstEmptySeat method, I can just search for the first portion of the array that is null by using a for loop then setting it to the String name that was given by the instructor, correct? Then I would proceed to return the updated array names[] to the getOn method since the 'child' would now be residing on the bus. So, in order to enter the name into the array, since I have to declare the names in the main method, would it be advantageous to set a public String name in the beginning so that I can just reference that as the child's name in the individual methods? Or, could I just do something like;



       public int findFirstEmpty()
        {
             //Where it puts the name into the array
     
            //If there is nobody in the seat, put the child in that seat.
            String n;
            for (int i = 0; i < 100; i++)
    	{
    		if (names[i] != null)
    		{
    			n = names[i];
     
    		}
                    else
                    {
     
                    }
    	}
            return names;
     
        }

    where the for loop and if statement find the null and enter it in?

    Thank you again for your advice on this, I really appreciate it.

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    Default Re: Stuck and can't get past it!

    Does that code compile without errors? You should compile your code before posting it so you can include the compiler errors with the posted code and not have to do another post later with the text of the error messages.

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    Default Re: Stuck and can't get past it!

    Quote Originally Posted by Norm View Post
    Does that code compile without errors? You should compile your code before posting it so you can include the compiler errors with the posted code and not have to do another post later with the text of the error messages.

    Okay, got it, I'm new to doing this so wasn't sure. The portion of code doesn't compile and I am getting this error on my return statement;

    incompatible types, required int.

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    Default Re: Stuck and can't get past it!

    What type of value is the method the return statement in supposed to return?
    What is the data type of variable on the return statement.
    Hint: int[] is not the same as int

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    Default Re: Stuck and can't get past it!

    Quote Originally Posted by Norm View Post
    What type of value is the method the return statement in supposed to return?
    What is the data type of variable on the return statement.
    Hint: int[] is not the same as int
    I thought it was supposed to return a sting. However, looking at it, it seems as though it should be returning some sort of int. I had set it up to return the string array names, since I believed that once the array was altered it would need to be returned to the getOn statement.
    The data type of my variable now is a string. Since the method is int, and according to my initial directions has to be int, should my return statement be an int?

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    Default Re: Stuck and can't get past it!

    You need to decide what the method is supposed to do BEFORE you write the code.
    What is the function of the method? What does it do? What is it supposed to return?

    To help you keep that clear, you should write some comments just before the method that says what the method is supposed to do and what it is supposed to return.

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    Default Re: Stuck and can't get past it!

    The function, as far as I'm understanding, is to scan my array and find the first available null position.
    It then would place the name/string into that null position and fill it.
    As for the return, I believe that it should be returning the integer position that the name is located at in the array. That makes more sense to me since this method is an int method and I'm working with integers in order to solve it.
    I pieced those as comments into my code.

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    Default Re: Stuck and can't get past it!

    You're mixing the finding of the empty slot with putting a value in that slot.
    Those should be done in separate places. Keep the method simple: find and return the index of the empty slot.
    the method name: findFirstEmpty doesn't say it is going to put anything into the slot.

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    Default Re: Stuck and can't get past it!

    Alright, I see what you're saying there. I was under the impression that you had to find and place the string into the array in the findFirstEmpty. So, basically what you mean is that I will locate the portion null in the array in findFirstEmpty, then return the integer location to getOn, then place the name into the array in getOn, correct?
    Then my findFirstEmpty would for sure return an integer. Since names is a string array, should my if statement still place n = names[i]? I declared n as a String, but now, wouldn't it have to be an integer. Or, is it possible to just return i? I've tried something like this;


      public int findFirstEmpty()
        {
            /**
             * Function of this method is to scan the array for the first null 
             * position  
             */    
     
            String n;
            for (int i = 0; i < 100; i++)
    	{
                /**
                 * Scan the array by using int i to correspond to the position of the 
                 * 'seat' in the 'bus'
                 */
                if (names[i] != null)
                {
                        n = names[i];
                        return i;
     
                }
    	}
            //return the integer value where the empty seat is located
     
        }
    Which gives me the error that I'm missing the return statement. Is that sort of what you were implying?

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    Default Re: Stuck and can't get past it!

    What if there are no null entries? What will the code do then?
    The compiler sees that case and sees that you do not have a return statement for it.
    Decide what the code should do in a NO-FIND and return that. Many methods return a -1 to indicate no find.

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    Default Re: Stuck and can't get past it!

    Okay, so something like this;

    public int findFirstEmpty()
        {
            /**
             * Function of this method is to scan the array for the first null 
             * position  
             */    
     
           // String n;
            for (int i = 0; i < 100; i++)
    	{
                /**
                 * Scan the array by using int i to correspond to the position of the 
                 * 'seat' in the 'bus'
                 */
                if (names[i] != null)
                {
                        //n = names[i];
                        return i;
     
                }
                else
                {
                        return i = -1;
                }
    	}
            //return the integer value where the empty seat is located
     
        }
    Where the else statement returns -1, which indicates that there was a no-find, like you said in the last post. This is still giving the same error of missing the return statement. If I try to post a return statement outside of the for loop, then it eliminates that error. So, should my return statements be inside the for loop or outside? I'm not sure why it's giving that error now.

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    Default Re: Stuck and can't get past it!

    Look at the code and think about these two cases:
    If the first element in the array is not null, what will the code do?
    What if none of the elements in the array are null and the code exits the loop?

    return i = -1;
    Why are you assigning a value to i? The i variable goes away when execution exits from a method.
    return -1;
    willdo.

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    Default Re: Stuck and can't get past it!

    That makes sense, okay. So I moved the return -1; outside of the for loop altogether, which eliminated the error. Now, I also removed the String n; and the n = names[i];, which I think would be correct, since that was what I was using to set the name into the array.
    Since my findFirstEmpty method now will scan the array and locate the empty spot, I can use it in the getOn function. So would it make sense to do something like this (comment wise);

       public void getOn(String name)
        {
            //Read the name into the method.
     
     
            //Use the findFirstEmpty to locate the first null seat
            name.findFirstEmpty();
     
            //Take the empty seat and put the child in it
     
            //Return the seat with child in it.
     
     
        }
    From there, This is that I think I should do;
    I should have the string name carry over from the main method, since that's where the name is coming from. Then it should use the findFirstEmpty to return the empty location, then it should set that array location to the name. So, something like Name[x] = String name;?

    By the way, thank you again for all of your help, this is actually making sense, I'm not just typing random things and hoping they work, like a lot of my classes have been having us do.

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    Default Re: Stuck and can't get past it!

    When a method returns a value, when you call it you should assign that returned value to a variable:
    variable = aMethodThatReturnsValue();

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    Default Re: Stuck and can't get past it!

    So, in reference to my own code, it would be something along the lines of;
    name = findFirstEmpty();
    But, what I don't understand is whether or not the variable I need is an int or a String. Since findFirstEmpty works with integers, wouldn't I have to deal with integers in regards to the variable used, or is that not what you meant?

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    Default Re: Stuck and can't get past it!

    The variable must be the same type as what the method returns.

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    Wonderlandslost (February 12th, 2012)

  37. #25
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    Default Re: Stuck and can't get past it!

    Right, so

    int x = findFirstEmpty();

    is what it needs then.
    I'm confused how to take that variable and apply it to the array then. How do I use the string array with an integer?

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