How do i get rid of this space?

Question

okay, i'm having trouble with this method, i've tried so many ways to get rid of the single space before the "]" , if i do a "\b" anytime after the for statement is done, it just prints a small square.
   // prints out the prime numbers inside sieve
    public void printPrimeNumbers(){
        int n = 0;
        System.out.print("[");
        for(int i = 0; i < sieve.length - 1; i++){
            n++;
            if (sieve[i] == true && n != sieve.length - 1)
                System.out.print(i + " ");
        System.out.print("]");
    }for instance if i implement the following in client code
PrimeNumbers test = new PrimeNumbers (15);// new boolean array from 0-14
System.out.println( test ); // prints t or f if the index is a prime number
        System.out.println("There are " + test.getNumberPrimeNumbers(15) +
                           " prime nummbers in the sieve from 1 to 15");
        System.out.println("There are " + test.getNumberPrimeNumbers(25) +
                "  prime numbers in the resized sieve from 1 to 25"); // test is resized by a helper method
         test.printPrimeNumbers(); // prints the index of the array created inside the object if it is primehere is the output of the program:
[F F T T F T F T F F F T F T F F]
There are 6 prime nummbers in the sieve from 1 to 15
There are 9 prime numbers in the resized sieve from 1 to 25
[2 3 5 7 11 13 17 19 23 ]
my question is how do i get rid of the space in between the 23 and the ] , i've tried so many ways that have failed to do so.
Thanks

Answer 1

my question is how do i get rid of the space in between the 23 and the ] , i've tried
so many ways that have failed to do so.Just don't print it in the first place.public void printPrimeNumbers() {
    int n = 0;
    boolean first = true;
    System.out.print("[");
    for(int i = 0; i < sieve.length - 1; i++){
        n++;
        if(sieve[i] == true && n != sieve.length - 1) {
            if(first) first = false;
            else System.out.print(" ");
            System.out.print(i);
        System.out.print("]");
}[Edit] Too slow!