Java: Incompatible Types (int/boolean) -

import java.io.*; public class adamhmwk4 {     public static void main(string [] args) throws ioexception {         bufferedreader br = new bufferedreader(new inputstreamreader(system.in));          int counter1;         int counter2;         int counter3;         string answer = "";          system.out.println("welcome adam's skip-counting program!");         system.out.println("please input number skip count by.");         counter1 = integer.parseint(br.readline());          system.out.println("please input number start at.");         counter2 = integer.parseint(br.readline());          system.out.println("please input number stop at.");         counter3 = integer.parseint(br.readline());          system.out.println("this skip counting by" + counter1 + ", starting at" + counter2  + "and ending at" + counter3 +":");          while (counter2 = counter3) {             counter2 = counter2 + counter1;             counter3 = counter2 + counter1;         }     } } 

i trying make skip-counting program. when compile code, line while(counter2 = counter3){ shows incompatible types error. compiler says found "int" requires "boolean". please keep in mind newbie, have not learned booleans in java class yet.

you can't compare values =, assignment operator. use == compare values. change

while(counter2 = counter3){ 

to

while(counter2 == counter3){ 

here's introductory page java operators.