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Thread: problem with deleting from an array

  1. #1
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    Default problem with deleting from an array

    Hi, I have a problem with a method from my work, which I can't seem to find.
    So here's the problem: - I have a method called deleteGroup(String name) and, as the name says it's supposed to delete a group from a given array, if the array isn't empty and if the group has the same name has the given one.
    Here's the code:

    public void deleteGroup(String nameG) {
    if (gCounter != 0) {
    if (groupExists(groups[0].getName(), nameG)) {
    this.groups = new Cgrupo[1];
    gCounter = 0;
    }
    throw new NonExistantGroupException();
    }
    throw new NonExistantGroupException();
    }

    (yes it's a one value array, since this is just the 1st phase of the work, next ones will be using maps and list, etc)

    well here's the groupExists method, since it appears to block there and throw the NonExistantGroupException:

    private boolean groupExists(String name1, String name2) {
    return name1.equalsIgnoreCase(name2);

    }

    So this is my problem, I'm pretty sure it must be an incredible stupid mistake. I hope any of you can point it out, because I have lost all hope in solving this.

    Kind regards and thanks for help.


  2. #2
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    Default Re: problem with deleting from an array

    Point out what? You haven't provided enough details of what your problem is.
    Improving the world one idiot at a time!

  3. #3
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    Default Re: problem with deleting from an array

    this if: if (groupExists(groups[0].getName(), nameG)), appears to be the problem, but I'm not quite sure what is wrong in there.

  4. #4
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    Default Re: problem with deleting from an array

    Neither are we unless you can provide more details. Do you say to your mechanic "my car doesn't work" and expect him to know what the problem is?
    Improving the world one idiot at a time!

  5. #5
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    Default Re: problem with deleting from an array

    The only thing I can do is put here all the pieces of code that affect or are affected by this method, because if I knew what the problem was I wouldn't be asking, I just know it doesn't delete the array as I wanted.

    Constructor:

    public class CsocialNet implements IsocialNet {

    private Iutilizador[] users;
    private Igrupo[] groups;
    private int uCounter;
    private int gCounter;

    public CsocialNet() {
    this.users = new Cutilizador[1];
    this.groups = new Cgrupo[1];
    this.uCounter = 0;
    this.gCounter = 0;
    }

    @Override
    public void deleteGroup(String nameG) {
    if (gCounter != 0) {
    if (groupExists(groups[0].getName(), nameG)) {
    this.groups = new Cgrupo[1];
    gCounter = 0;
    }
    throw new NonExistantGroupException();
    }
    throw new NonExistantGroupException();
    }

    private boolean groupExists(String name1, String name2) {
    return name1.equalsIgnoreCase(name2);

    }

    And here's the class that creates the object stored in the array:


    package gestorAmigos;

    public class Cgrupo implements Igrupo {

    private String name;
    private String description;

    // mudar para fase 2
    private String[] members;
    private int counter;

    public Cgrupo(String name, String description) {

    this.name = name;
    this.description = description;
    this.counter = 0;
    this.members = new String[1];
    }

    @Override
    public String getName() {
    return this.name;
    }

    @Override
    public String getDescription() {
    return this.description;
    }

    @Override
    public void addMember(String login) {
    if (counter == 0) {
    members[counter++] = login;
    } else {
    counter = 0;
    addMember(login);
    }
    }

    // mudar proxima fases.
    public String getMembers() {
    return members[0];
    }

    public String toString() {
    return this.name + "\n" + this.description + "\n";
    }

    // mudar para outras fases
    public boolean seekMember(String login) {
    return members[0].equalsIgnoreCase(login);

    }

    // mudar para outras fases
    @Override
    public void kickMember(String login) {
    if (members[counter].equalsIgnoreCase(login)) {
    this.counter = 0;
    this.members = new String[1];
    }
    }

    public boolean hasMembers() {
    if (counter == 0) {
    return false;
    }
    return true;
    }

    }

    EDIT: Here's the main call for this method, though I'm pretty sure it's not the problem:

    private static void deleteGroup(Scanner in, IsocialNet sc) {

    String name = "";

    try {

    name = in.next();
    sc.deleteGroup(name);
    System.out.println(MESSAGES.GROUPDELSUCC + "\n");

    } catch (NonExistantGroupException e) {
    System.out.println(MESSAGES.GHOSTGROUP + "\n");
    }
    }

  6. #6
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    Default Re: problem with deleting from an array

    You may not know what is causing your problem but you can explain/describe it.

    Do you get errors when you compile or run your code? Then post the exact message here.
    Does the program not behave as expected? Then post what your input was, what in correct output or behaviour you got and what you expected to happen instead.

    The more details you provide the easy it is for us to help you.
    Improving the world one idiot at a time!

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