package exercises;

import java.time.Duration;
import java.time.LocalTime;

/**
 *
 * @author Lefteris Moussiades
 */

public class PrimeNumber {
    private int value;
    
    PrimeNumber(int val) {
        if (!isPrime(val)) throw new RuntimeException();
        value=val;
    }
    static boolean isPrime(int val) {
        if (val<=1) return false;
        for (int i=2; i<=val/2; i++)
            if (val%i==0) return false;
        return true;
    }

    public int getValue() {
        return value;
    }

    public void setValue(int value) {
        this.value = value;
    }
    
    static int getNext(int val) {
        do {
            if (isPrime(++val)) return val;
        } while (true);
    }
    
    PrimeNumber getNext() {
        return new PrimeNumber(getNext(value));
    } 
    
    public String toString() {
        return String.valueOf(value);
    }
    
    static void prt100First() {
        LocalTime tArx=LocalTime.now();
        PrimeNumber prime=new PrimeNumber(getNext(0));
        int j=0;
        do {
            //System.out.println(j+" "+prime+" ");
            prime=prime.getNext();
        } while (j++<100000);
        LocalTime tTel=LocalTime.now();
        Duration d=Duration.between(tArx, tTel);
         System.out.println(d.getSeconds()+":"+d.getNano());
    }
    
    public static void main(String[] args) {
        /*
        System.out.println(isPrime(1));
        PrimeNumber p1=new PrimeNumber(7);
        int i=0;
        while (i<100) {
            i=PrimeNumber.getNext(i);
            System.out.print(i+" ");
        }
        System.out.println("---------------------------------");
        for (i=0; i<100; i++)
            if (isPrime(i)) System.out.print(i+", ");
        System.out.println();
        System.out.println("2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53, 59, 61, 67, 71, 73, 79, 83, 89, 97");
        */
        prt100First();
        
            
    }

}