java program check

[ryamz]

Im beginning a java book and am having trouble on one of hte exercises.
The exercise is

1. Create a class named Household that includes data fields for the number of occupants and the annual income, as well as methods named setOccupants ( ), setIncome ( ), getOccupants ( ), and getIncome ( ) that set and return those values, respectively. Also, create a constructor that requires no arguments and automatically set the occupants field to 1 and the income field to 0. Name the program as Household.java.

and here's my code:

public class household
{


private int occupants;
private double income;

household house = new household();

public void setOccupants( int newOccupants)
{
occupants = newOccupants;
house.getOccupants();

}
public void setIncome( double income)
{
income = 0;
house.getIncome();


}
public int getOccupants()
{
return occupants;
house.setOccupants(16);

}
public double getIncome(double income)
{
return income;
house.setIncome(157.73);
}
public household()
{
occupants = 1;
income = 0;
}

}

and the problem is this:
buiLd output

C:\Documents and Settings\bLah\My Documents\household.java:20: getIncome(double) in household cannot be applied to ()
house.getIncome();
^
1 error

Process completed.

general output

java.lang.NoSuchMethodError: main
Exception in thread "main"
Process completed.

anyone can heLp me about this? :(

[mine0926]

Im a beginner but as I see your code to getIncome method is

    public double [b]getIncome(double income)[/b]
    {
        return income;
        house.setIncome(157.73);
    }

then you call your method like this

    public void setIncome( double income)
    {
        income = 0;
        [b]house.getIncome();[/b]
        ...

Good Luck,
geje

[Fubarable]

In this simple exercise, your getter method such as getIncome() should not take a parameter. Rather it should simply return the value held by the income field, nothing more.

setIncome on the other hand should take a value, the new income value, and you should use this parameter to set the income field, and do nothing more in that method. For instance:

public class SimpleEg {
   private int myValue;

   // all this method does is return the value held by the myValue field
   public int getMyValue() {
      return myValue;
   }

   // all this method does is set the value held by the myValue field
   public void setMyValue(int myValue) {
      this.myValue = myValue;
   }
   
   
}

[Fubarable]

Im a beginner but as I see your code to getIncome method is

    public double [b]getIncome(double income)[/b]
    {
        return income;
        house.setIncome(157.73);
    }

then you call your method like this

    public void setIncome( double income)
    {
        income = 0;
        [b]house.getIncome();[/b]
        ...

Good Luck,
geje

???

To the original poster: mine means well, but please ignore his post.

[Zack]

Actually mine0926 did raise a correct point; though he didn't state it well, he pointed out the fact that getIncome() was called with no parameters, but the function declaration was set up to accept one parameter.

In any case, Fubarable's post has the right information for you.