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Thread: Method Adding elements to an array with certain restrictions

  1. #1
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    Default Method Adding elements to an array with certain restrictions

    import java.util.Scanner;

    class WordTest1
    {
    public static void main(String[] args)
    {
    Scanner input = new Scanner(System.in);
    WordGen.initialise(input);
    System.out.print("Enter the number of words you wish to generate: ");
    int n = input.nextInt();
    WordStore words = new WordStore(n);
    for(int i=0; i<n; i++)
    words.add(WordGen.make());
    String line = input.nextLine();
    System.out.println("Enter words to test, empty line to exit");
    line = input.nextLine();
    while(!line.equals(""))
    {
    String[] wordlist = line.split(" ");
    for(int i=0; i<wordlist.length; i++)
    {
    int count = words.count(wordlist[i]);
    System.out.print("\""+wordlist[i]+"\" ");
    if(count==0)
    System.out.println("NOT generated");
    else if(count==1)
    System.out.println("generated once");
    else
    System.out.println("generated "+count+" times ");
    }
    line = input.nextLine();
    }
    }
    }

    import java.util.*;

    class WordStore
    {

    public int a = 0;
    public WordStore(int n){
    a = n;

    }


    public String[] storewords = new String[a];
    public int count=0;

    public void add(String word){
    storewords[count] = word;
    count=count+1;
    }

    }

    WordGen.java just cretaes random words

    Why do i get an ArrayIndexOutOfBounds Exception: 0
    at WordStore.add(WordStore.java:20)
    at WordTest1.main(WordTest1.java:13)

    U cant change the code in WordTest1.java, but can change WordStore.java, but add method has to be declared

    public void add(String word)


  2. #2
    Super Moderator copeg's Avatar
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    Default Re: Method Adding elements to an array with certain restrictions

    Quote Originally Posted by Newoor View Post
    Why do i get an ArrayIndexOutOfBounds Exception: 0
    at WordStore.add(WordStore.java:20)
    at WordTest1.main(WordTest1.java:13)
    You receive this error because you are intialiizing the array storewords with zero (the initial value of a). A more appropriate way is to initialize the array in your constructor:


     
    public String[] storewords;
     
    public WordStore(int n){
        a = n;
        storeworkds = new String[a];
    }

  3. The Following User Says Thank You to copeg For This Useful Post:

    Newoor (December 13th, 2009)

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