Find the Error in Class Code

Hello. I copying some code for a class from a text on Java. Even though I beleive I have gotten the code correct, I get error messages, Can anyone helps me resolve this?

The code:

Code:

---

public class Primefinder implements Runnable {
        public long target;
        public long prime;
        public boolean finished = false;
        private Thread runner;

        PrimeFinder(long inTarget) {
                target = inTarget;
                if (runner == null) {
                        runner = new Thread(this);
                        runner.start();
                }
        }

        public void run() {
                long numPrime = 0;
                long candidates = 2;
                while (numPrime < target) {
                        if (isPrime(candidate)) {
                                numPrimes++;
                                prime = candidate;
                        }
                        candidate++;
                }
                finished = true;
        }
       
        boolean isPrime(long checkNumber) {
                double root = Math.sqrt(checkNumber);
                for (int i =2; i <= root; i++) {
                        if (checkNumber % i == 0)
                                return false;
                }
                return true;
        }
}

---

The error messages on compiling:
"invalid method declaration; return type required"
"PrimeFinder(long inTarget) {'

Thank you.

Java is case sensitive - look at the class name and the constructor name.
The f is in a different case

Hi
you are declaring Primefinder class constructor PrimeFinder .F should be in small case i.e. exactly same as class name

Hello. Aha, I got it. Thank you for showing me what I did wrong. Bogie.