[hardwired]

A good question. In this method signature

Code:

public myfunct(boolean mybool )

The argument "mybool" is a local variable which has scope limited to the body (curley braces) of the method. In this local scope it hides/shadows the member variable (in class scope) of the same name. So the expected answer is "no."
Let's test it:

Code:

import java.util.Random;

public class Test {
    static Random r = new Random();
    static boolean isItTrue = false;

    static private boolean howBoutThis(boolean isItTrue) {
        isItTrue = r.nextBoolean();
        return isItTrue;
    }

    public static void main(String[] args) {
        Random seed = new Random();
        for(int j = 0; j < 5; j++) {
            boolean b = seed.nextBoolean();
            System.out.printf("howBoutThis(%5b) = %5b  isItTrue = %b%n",
                               b, howBoutThis(b), isItTrue);
        }
    }
}