Question

I asked this same question on javaprogrammingforums.com but it seems their website is down right now. So I couldn’t see what responses (if any) I got. Anyways, I am badly stuck on this Java HW assignment. What I have so far looks good in terms of completion, now it’s just getting the right values to appear. Pretend I have this:

(This is only part of the 2nd class of the two with the constructor, the other is the “tester”)

//private variables
boolean myP;
boolean myPla;
boolean myGl;
boolean myCa;

double myPlot;
int myCrust;

double myReduct;
double myNet;
double myGross;

boolean [] trshIt = {myP, myPla, myGl, myCa};
double [] CO2TrashEmissions = {184.0, 25.6, 46.6, 165.8};

//constructor
CO2FromWaste(int crust, boolean p, boolean pl, boolean gl, boolean ca)
{
    myPlot = 1018.0;
    myCrust = crust;
    myP = p;
    myPl = pl;
    myGl = gl;
    myCa = ca;
}

My issue is that boolean array, trshIt. Since I am putting variables in the array that have not been initialized yet, it gives those variables default values of false. If I put it in the constructor first, then I get an error complaining that the variable trshIt can not be found; pointing to the instance that I am calling that variable. So I have tried different forms of it in different areas and I am like trapped in a maze right now trying to get that array to work properly. I need all the help I can get. Ideas?

Answer 1

Declare trshIt as a member of the class, but initialize it in the constructor, like this:

boolean [] trshIt;
double [] CO2TrashEmissions = {184.0, 25.6, 46.6, 165.8};

//constructor
CO2FromWaste(int crust, boolean p, boolean pl, boolean gl, boolean ca)
{
    myPlot = 1018.0;
    myCrust = crust;
    myP = p;
    myPl = pl;
    myGl = gl;
    myCa = ca;

    trshIt = new boolean[4];
    trshIt[0] = myP;
    trshIt[1] = myPla;
    trshIt[2] = myGl;
    trshIt[3] = myCa;
}