Databases
StackOverflow2013
Postsdbo
POTrying to get java program to add items to an unaccepted ArrayList
 

Note that there are some explanatory texts on larger screens.

plurals
  1. POTrying to get java program to add items to an unaccepted ArrayList
    primarykey
    data
    text
    <p>I've written a java picnic game (very basic), the only thing I don't know how to do is get the program not to accept items of the same letter. I also want the program to list how many times the user entered a rejected item. Note that this allows any ordering of items, as long as no two items start with the same letter (dis- regarding case). An acceptable sequence of inputs would be mustard , ketchup , tofu , anchovies . However, mustard , ketchup , tofu , and Kettle corn would not work since \ Kettle corn " begins with the same letter as \ ketchup</p> <h2>" (ignoring case).</h2> <pre><code>import java.util.*; public class PlayPicnic { public static void main(String[] args) { Scanner scan = new Scanner(System.in); Picnic picnic = new Picnic(); ArrayList&lt;String&gt; unaccepted = new ArrayList&lt;&gt;();`enter code here` while (picnic.numberOfItems() &lt; 5) { System.out.print("What do you want to bring on the picnic? "); String item = scan.nextLine(); if (picnic.okayToBring(item)) { picnic.add(item); } else { if(!unaccepted.contains(item)) unaccepted.add(item); System.out.println("Sorry, you can't bring " + item); } } System.out.println("\nHere's what we'll have at the picnic:"); picnic.show(); System.out.println(Arrays.toString(unaccepted.toArray())); } } </code></pre> <hr> <h2>corresponding class</h2> <pre><code>import java.util.*; public class Picnic { // INSTANCE VARIABLES: private ArrayList&lt;String&gt; stuffToBring; // items to bring on the picnic // CONSTRUCTOR: //----------------------------------------------------- // Construct a new Picnic. //----------------------------------------------------- public Picnic() { stuffToBring = new ArrayList&lt;String&gt;(); // initialize list } //----------------------------------------------------- // Given an item s, see if it's okay to add it to the list. // Return true if it is, false otherwise: //----------------------------------------------------- public boolean okayToBring(String s) { // "Secret rule" -- s can't be an item already in the list: if (stuffToBring.contains(s)) // "contains" is in the ArrayList class { return false; } else { return true; } } //----------------------------------------------------- // Given an item s, add it to the list (if it's okay to add it) //----------------------------------------------------- public void add(String s) { if (okayToBring(s)) // this test keeps people from cheating! { stuffToBring.add(s); } } //----------------------------------------------------- // Print the items in the list //----------------------------------------------------- public void show() { for (int i = 0; i &lt; stuffToBring.size(); i++) { String s = stuffToBring.get(i); System.out.println(s); } } //----------------------------------------------------- // Returns the number of items in the list: //----------------------------------------------------- public int numberOfItems() { return stuffToBring.size(); } } </code></pre>
    singulars
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. PTQuestion
    1. This table or related slice is empty.
    1. USuser3013468
    plurals
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. PO
      singulars
      1. PTAnswer
    2. PO
      singulars
      1. PTAnswer
    3. PO
      singulars
      1. PTAnswer
    1. VO
      singulars
      1. POTrying to get java program to add items to an unaccepted ArrayList
      1. This table or related slice is empty.
      1. VTDownMod
    1. COCould you reduce this down to the bare minimum code? E.g.I'm guessing the scanner based input isn't necissary for the problem
      singulars
      1. POTrying to get java program to add items to an unaccepted ArrayList
      1. USRichard Tingle
    2. COAlso, wouldn't a simple way to do this be to keep a list of used first letters and then reject if the input's first letter is used?
      singulars
      1. POTrying to get java program to add items to an unaccepted ArrayList
      1. USRichard Tingle
    3. COcant afford to read all , please mention what is unaccepted ArrayList
      singulars
      1. POTrying to get java program to add items to an unaccepted ArrayList
      1. USHussain Akhtar Wahid 'Ghouri'
 

Querying!

 
Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload