Java boolean value is always true

I'm having trouble with my school Java code - I'm trying to create a constructor that takes a boolean value, and then uses it later, but for some reason it's always true. Could anyone tell me what I'm doing wrong?

EDIT: I'm posting my entire code, I thought redacting it a little would make my problem clearer, but it seems it only created confusion.

        import java.util.*;
public class L3_Z6 {

public static void main(String[] args) {
    // TODO Auto-generated method stub

    class FunnyString{
        private boolean ascii;
        private String slowo;
        private char separator;


        public FunnyString (String slowo, char separator, boolean ascii){
            this.slowo=slowo;
            this.separator=separator;
            this.ascii=ascii;

        }
        public FunnyString (String slowo, char separator){
            this(slowo, separator, false);
        }
        public FunnyString (String slowo, boolean ascii){
            this(slowo,'-', ascii);
        }
        public FunnyString (String slowo){
            this(slowo,'-', false);
        }
        public void setAscii (boolean a){
            ascii=a;
        }
        public void setChar (char b){
            separator=b;
        }

        public String toString (){

            int dlugosc = slowo.length();
            int licznik = 0;
            String wynik="";
            do{
                if(ascii=false){
                wynik+=slowo.charAt(licznik);
                }
                if(ascii=true){
                    wynik+=(int)slowo.charAt(licznik);
                }
                if(licznik!=dlugosc-1)
                    wynik+=separator;
                licznik++;
            }while (licznik!=dlugosc);
            wynik+="\n";

            return wynik;
        }
    }
          FunnyString w1=new FunnyString("Kaktus");
          FunnyString w2=new FunnyString("Eukaliptus",'*');  
          FunnyString w3=new FunnyString("Yuka",true);

          System.out.println(w1);

          System.out.println(w2);

          System.out.println(w3);

          w1.setAscii(true);
          w1.setChar('*');
          System.out.println(w1);

          w3.setAscii(false);
          w3.setChar('!');
          System.out.println(w3);



}


}