Should this method be static? - class

Question

I am fairly new to java and am currently debugging a program. So I have a class that has a simple method with a few calculations. Basically when I call this method from another class to use a variable (that happens to be part of an array where some of it is being calculated) I get the calculation I need. Then I call it once more in another class, it calculates again and my numbers become compromised. Is there a way to have this method take in some value, calculate and then stay put?
This is the array class. I need to instantiate this once and then have the values for the arrays be static when I call it again. Is there a way to make the method stay put while I just call the arrays?
In another class I use PlanMat pm = new PlanMat()
then something like pm.materials(fSi, fS, fO); and to call an array pm.rho0[48];
public class PlanMat {
Constants con = new Constants();
double GPa = con.GPascals;
Main m = new Main();
public int i ;
public int eos [ ];
public double rho0 [ ];
public double c [ ];
public double nn [ ];
public double Ks0 [ ];
public double Ksp [ ];
public void materials(double fSi, double fS, double fO)
{
i = 0;
eos = new int [ 51 ];
rho0 = new double [ 51 ];
c = new double [ 51 ];
nn = new double [ 51 ];
Ks0 = new double [ 51 ];
Ksp =new double [ 51 ];
double fFeS = ( ((con.M_Fe / con.M_S) + 1) * fS );
double fFeSi = ( ((con.M_Fe / con.M_Si) + 1) * fSi);
double fFeO = ( ((0.950 * con.M_Fe) + con.M_O) / (1.95 * con.M_O) * fO);
double fFe = 1.0 - fFeS - fFeSi - fFeO;
i = 48;
eos [ i ] = 1;
rho0 [ i ] = 1.0 / ( (fFe / rho0[3]) + (fFeSi / rho0[21])
+ (fFeO / rho0[22]) + (fFeS / rho0[13]) );
Ks0 [ i ] = fFe * Ks0[3] + fFeSi * Ks0[21] + fFeO * Ks0[22]
+ fFeS * Ks0[13];
Ksp [ i ] = fFe * Ks0[3] + fFeSi * Ks0[21] + fFeO * Ks0[22]
+ fFeS * Ks0[13];
c [ i ] = 0.0;
nn [ i ]= 0.0;
}
}

Answer 1

There are two wasys to acheive this:
First:
You should write set and get methods, call to set method to set the values and get method to get the values. You would be setting the values say in class1 you set the values and now if you want the same values in class2 to you would be calling your get method to get the values as an array and pass this array as an argument to the constructor of class2.
Second:
You can pass the whole object to the class2 constructor and use that object in that class your values will be same and data will not be compromised but for this you will have to implement the Serializable on your data class(That you are using in both.)

Answer 2

class a{
......
function()
{
a,b
}
}
class b{
...function(){
here u need your variable value.
call the function and store the variable value in new variable.
}
}
if u need to do same u can do
class c{
...function(){
here u need your variable value.
call the function and store the variable value in new variable.
}
}