Passing an int function to a while loop in java

I am implementing the three Missionary and Canniball problem.When implementing it works fine in c++ and python but gives an error in the while loop when implemented in java. The code in c++ is as follows:

/* Variables are as follows: * im and ic = initial missionaries and cannibal respectfully * fm and fc = final missionaries and cannibal respectfully * status = indicates what side we are on * select = used in solution() method to determine the boat grouping * flag = used to determine boat's current location * i = loop counter */

int im = 3, ic = 3, i, fm = 0, fc = 0, status = 0, flag = 0, select = 0;

void display(char bpass1, char bpass2)

{

cout << "\n\n\n";
for (int i = 0; i < fm; i++) 
    cout << " M "; 
for (int i = 0; i < fc; i++)
    cout << " C "; 

if (flag == 0)
    cout << "     ~~~~~WATER~~~~~<B0(" << bpass1 << "," << bpass2 << ")AT>  ";
else
    cout << "     <BO(" << bpass1 << "," << bpass2 << ")AT>~~~~~WATER~~~~~  ";
for (int i = 0; i < im; i++)
    cout << " M ";
for (int i = 0; i < ic; i++)
    cout << " C ";

}

int win()

{

return (fc == 3 && fm == 3) ? 0 : 1;

}

/** Basic algorithm is as follows: * 1 - Get boat's current location * 2 - Determine passenger grouping * 3 - Make trip * 4 - Determine if we won * 5 - Repeat until we won */

void solution()

{

while (win()) //In java gives me error here in my IDE. 

{

    if (!flag)
    {
        switch (select)
        {
            case 1: display('C', ' ');
                    ic++;
                    break;
            case 2: display('C', 'M');
                    ic++; im++;    
                    break;   
        }

        if (((im - 2) >= ic && (fm + 2) >= fc) || (im - 2) == 0)
        {
            im = im - 2;
            select = 1;
            display('M', 'M');
            flag = 1;
        }
        else if ((ic - 2) < im && (fm == 0 || (fc + 2) <= fm) || im == 0)
        {
            ic = ic - 2;
            select = 2;
            display('C', 'C');
            flag = 1;
        }

        else if ((ic--) <= (im--) && (fm++) >= (fc++))
        {
            ic = ic - 1;
            im = im - 1;
            select = 3;
            display('M', 'C');
            flag = 1;
        }
    }

    else
    {
        switch (select)
        {
            case 1: display('M', 'M');
                    fm = fm + 2;
                    break;

            case 2: display('C', 'C');
                    fc = fc + 2;
                    break;   

            case 3: display('M', 'C');
                    fc = fc + 1;
                    fm = fm + 1;
                    break;
        }

        if (win())
        {
            if (((fc > 1 && fm == 0) || im == 0))
            {
                fc--;
                select = 1;
                display('C', ' ');
                flag = 0;
            }

            else if ((ic + 2) > im)
            {
                fc--; fm--;
                select = 2;
                display('C', 'M');
                flag = 0;
            }
        }
    }
}

}

int main()

{

cout << "MISSIONARIES AND CANNIBAL SOLUTION";
display(' ', ' ');
solution();
display(' ', ' ');
return 0;

}

I don't know where am i going wrong.Any replacement of the code with same output(in java) or correction is appreciated.Thanks!!