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Thread: Possibly a noobish issue

  1. #1
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    Default Possibly a noobish issue

    Java Class

    package Aula_Teo;
     
    public class Contacto {
     
        private static class string {
     
            public string() {
            }
        }
     
        private int numero;
        private string nome;
        private int telefone;
        private boolean tipo;
     
    private static int numC=0;
     
     
    public Contacto(string nomeC, int telefoneC, boolean tipoT){
        this.numero=++numC;
        this.nome=nomeC;
        this.telefone=telefoneC;
        this.tipo=tipoT;
    }
     
    public int getNumero(){
        return this.numero;
    }
     
    public string getNome(){
        return this.nome;
    }
     
    public int getTelefone(){
        return this.telefone;
    }
     
    public boolean isMovel(){
        return this.tipo;
    }
     
    public void setNome(string nomeCont){
        this.nome=nomeCont;
    }
     
    public void setTelefone(int tel){
        this.telefone=tel;
    }
    public void setTipo(boolean t){
        this.tipo=t;
    }
    }

    Java Main Class

    package Aula_Teo;
     
    import java.util.Scanner;
     
     
    public class Agenda {
     
        static Scanner scan = new Scanner(System.in);
     
        public static void main(String[] args) {
            Contacto[]agenda=new Contacto[50];
     
            int conta=0;
     
            /*
             * agenda[0]=insereContacto();
             * agenda[1]=insereContacto();
             * agenda[2]=insereContacto();
             * agenda[3]=insereContacto();
             * agenda[4]=insereContacto();
            */
     
            for(int i=0;i<5;i++){
                agenda[i]=insereContacto();
                scan.nextLine();
                conta++;
            }
     
            for (int i=0;i<conta;i++)
                imprimeContacto(agenda[i]);
     
            //para inserir a pesquisa
     
            System.out.println("Introduza um número de telefone: ");
            int num=scan.nextInt();
            int pos=pesqTelefone(agenda, conta, num);
            if (pos==-1)
                System.out.println("O número não conta da listagem");
            else
                imprimeContacto(agenda[pos]);
     
        }
     
        private static Contacto insereContacto(){
     
            String nomeCont; int tel; boolean t;
            char op;
     
            System.out.println("Nome: ");
            nomeCont=scan.nextLine();
     
            do{
            System.out.println("Nº telefone: ");
            tel=scan.nextInt();
            }while(tel<100000000||tel>999999999);
     
            do{
                System.out.println("Tipo (movel/fixo): ");
                op=scan.nextLine().charAt(0);
            }while(op!='m'||op!='M'||op!='f'||op!='F');
     
            if (op=='m'||op=='M')
                t=true;
            else
                t=false;
     
            return new Contacto(nomeCont,tel,t);
        }
     
        private static void imprimeContacto(Contacto c){
     
            System.out.println("Numero:"+c.getNumero());
            System.out.println("Nome:"+c.getNome());
            System.out.println("Telefone:"+c.getTelefone());
            if (c.isMovel()==true)
                System.out.println("Movel");
            else
                System.out.println("Fixo");
        }
     
        //alínea ii
     
        private static int eliminaContacto(Contacto[] v,int pos,int nElem){
     
     
            v[pos]=v[nElem-1];
     
            return --nElem;
        }
     
        private static int pesqTelefone(Contacto[]v, int nElem, int numT){
     
            int i=0;
            while(i<nElem && numT!=v[i].getTelefone())
                i++;
            if (i<nElem)
                return i;
            else return -1;
        }
     
        private static int pesqNome(Contacto[]v, int nElem, String nomeP){
     
            int i=0;
            while(i<nElem && !nomeP.equalsIgnoreCase(v[i].getNome()))
                i++;
            return i;
        }
     
    }

    In the Java Main Class, where: return new Contacto(nomeCont,tel,t); appears I get an error which says:

    cannot find symbol
    symbol: constructor Contacto(java.lang.String,int,boolean)
    location: class Aula_Teo.Contacto

    which also causes an error here: while(i<nElem && !nomeP.equalsIgnoreCase(v[i].getNome()))

    I think this might be a noobish question, but hey, I'm just starting so...
    Thank you for any help you might give me


  2. #2
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    Default Re: Possibly a noobish issue

    Your inner class string does nothing.

    Does tipo mean type?

    conta was never defined as a variable in the main method, at least not before you used it, so it won't know what to do with it.

  3. #3
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    Default Re: Possibly a noobish issue

    scan.nextLine();

    This scans but doesn't set it to anything.

    String str = "";

    and then later

    str = scan.nextLine(); will at least set it to something

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    Default Re: Possibly a noobish issue

    for(int i=0;i<5;i++){
    agenda[i]=insereContacto();
    scan.nextLine();
    conta++;
    }

    do you mean i < 50?

    Otherwise, there will be 50 agenda, but only 5 will have values.

    if (pos==-1)

    should be replaced by

    if (pos >=0 && pos < agenda.length)

    else
    imprimeContacto(agenda[pos]);

    this won't work unless you have all 50 values as my if statement above will let it work and not get a compiler error,

    but if they enter like 30, you've got nothing in index 30 so it'll throw a Null Pointer Exception.

  5. #5
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    Default Re: Possibly a noobish issue

    Java already has a class called String, with a capital S. You don't need to write your own, unless you have to.

  6. #6
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    Default Re: Possibly a noobish issue

    if (c.isMovel()==true)

    Actually, boolean method can be written

    if (c.isMovel())

    if checking to see if true

    and

    if (!c.isMovel())

    if checking to see if false

  7. #7
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    Default Re: Possibly a noobish issue

     

    cannot find symbol
    symbol: constructor Contacto(java.lang.String,int,boolean)
    location: class Aula_Teo.Contacto




    I think this means that you had an inner class called string, and maybe you called it.

    You forgot to capitalize String.

    When it pass it a String,

    it expected a type of type "string".

  8. #8
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    Default Re: Possibly a noobish issue

    javapenguin is correct.... Delete your inner string class.... and then change the type in the constructor from string to String

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