Error while trying to add everything together through a Java class

Question

I’m doing a small project on expense control, I’m with a class called Expense which is an abstract class, and other classes called Transport,Feeding and Daily will inherit from it the total value of expenses and two other methods. And I also have a separate class called Expense manager with a method that will pass the class by parameter Expense and take the total value of all other classes, and sum the total value within a variable called total expenses. The problem is that when I calculate one of the three classes that are inheriting, Expense will go to all, being that I wanted to separate, the total value of each class and then the total sum of the three classes.

Class Expense manager :

public class GerenciadorDespesas {

    private int qtdeAlimentacao;
    private int qtdeTransporte;
    private int qtdeDiaria;
    private double totalAlimentacao;
    private double totalTransporte;
    private double totalDiaria;
    private double totalDespesas;

    public int getQtdeAlimentacao() {
        return qtdeAlimentacao;
    }
    public void setQtdeAlimentacao(int qtdeAlimentacao) {
        this.qtdeAlimentacao = qtdeAlimentacao;
    }
    public int getQtdeTransporte() {
        return qtdeTransporte;
    }
    public void setQtdeTransporte(int qtdeTransporte) {
        this.qtdeTransporte = qtdeTransporte;
    }
    public int getQtdeDiaria() {
        return qtdeDiaria;
    }
    public void setQtdeDiaria(int qtdeDiaria) {
        this.qtdeDiaria = qtdeDiaria;
    }
    public double getTotalAlimentacao() {
        return totalAlimentacao;
    }
    public void setTotalAlimentacao(double totalAlimentacao) {
        this.totalAlimentacao = totalAlimentacao;
    }
    public double getTotalTransporte() {
        return totalTransporte;
    }
    public void setTotalTransporte(double totalTransporte) {
        this.totalTransporte = totalTransporte;
    }
    public double getTotalDiaria() {
        return totalDiaria;
    }
    public void setTotalDiaria(double totalDiaria) {
        this.totalDiaria = totalDiaria;
    }
    public double getTotalDespesas() {
        return totalDespesas;
    }
    public void setTotalDespesas(double totalDespesas) {
        this.totalDespesas = totalDespesas;
    }

    public void analisarDespesas(Despesa despesa) {
    setTotalAlimentacao(despesa.getValorTotal());
    setTotalTransporte(despesa.getValorTotal());
    setTotalDiaria(despesa.getValorTotal());
    setTotalDespesas(getTotalAlimentacao() + getTotalTransporte() +
            getTotalDiaria());

    }


}

Expense Class :

import javax.swing.JOptionPane;

public abstract class Despesa {

    private String descricao;
    private double valorTotal;

    public String getDescricao() {
        return descricao;
    }
    public void setDescricao(String descricao) {
        this.descricao = descricao;
    }
    public double getValorTotal() {
        return valorTotal;
    }
    public void setValorTotal(double valorTotal) {
        this.valorTotal = valorTotal;
    }

    public void cadastrarDespesa() {
        setValorTotal(0);
        setDescricao(JOptionPane.showInputDialog("Digite a descrição da Despesa : "));
    }


    public abstract void calcularDespesa();
    public abstract void listarDespesa();

}

Excuse me, if the explanation of the problem has gotten too big or if the code has gotten too big, please,.

Answer 1

You spoke: "...Expense manager with a method that will pass the Expense class by parameter and take the value total of all other classes,and sum the total value within a variable called total expenses. The problem is that when I calculate one of the three classes that are inheriting,the total value of the Expense class will go to all,being that I wanted to separate,the total value of each class and then the total sum of the three classes."

The solution is to create a static Expense Arraylist within Expenses and every time a new "Expense" object is created add it to that Array. This way all objects created within the class are saved

import java.util.ArrayList;

import javax.swing.JOptionPane;

public abstract class Despesa {

private static ArrayList<Despesa> despesa=new ArrayList<Despesa>();

private String descricao;
private double valorTotal;

public String getDescricao() {
    return descricao;
}

public void setDescricao(String descricao) {
    this.descricao = descricao;
}

public double getValorTotal() {
    return valorTotal;
}

public void setValorTotal(double valorTotal) {
    this.valorTotal = valorTotal;
}
   public void cadastrarDespesa() {
        setValorTotal(0);
        setDescricao(JOptionPane.showInputDialog("Digite a descrição da Despesa : "));
    }


    public abstract void calcularDespesa();
    public abstract void listarDespesa();

    public static ArrayList<Despesa> getDespesa() {
        return despesa;
    }

}

To add all the Expenses in the Management If you want to add just one, that first method of yours works

PS:I just didn’t understand why you’re assigning the same value to power, transfer and daily... But vlw

public void analisarDespesas(Despesa desp) {
    double ali = 0;
    double trans = 0;
    double dia = 0;
    double total = 0;

    for (Despesa despesa : Despesa.getDespesa()) {
        ali += despesa.getValorTotal();
        trans += despesa.getValorTotal();
        dia += despesa.getValorTotal();
        total += ali + trans + dia;
    }
    setTotalAlimentacao(ali);
    setTotalTransporte(trans);
    setTotalDiaria(dia);
    setTotalDespesas(total);
}

Thank you for giving that UP in the reply :)