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import java.io.*;public class Assignment1 {    /**     * @param args the command line arguments     */    public static void main(String[] args) {        long timeBegin = System.nanoTime();        int limit = 10000000;                boolean[] isPrime = new boolean[limit+1]; // initializes as false                for(int i = 2; i*i <= limit; i++) {            if(!isPrime[i]) {                for(int j = i; j*i <= limit; j++)   // i^2 and multiples of it                    isPrime[i*j] = !false;            }        }                try {            // printwriter does not flush by default            PrintWriter out = new PrintWriter("primes.txt"); //new BufferedWriter(new FileWriter("primes.txt")));            int primes = 0;            for(int i = 2; i <= limit; i++) {                if(!isPrime[i]) {                    out.println(i);                    primes++;                }            }                    out.close(); // flush & close                } catch(IOException e) { }                long timeEnd = System.nanoTime();        System.out.println("Execution took " + ((timeEnd-timeBegin)/1000000) + " ms");    }}