PrimeNumbers.java

public class PrimeNumbers {

	public static void main(String[] args) {
		// TODO Auto-generated method stub

		primesUntil50();
		System.out.println("-----------------");
		firstPrimes50();
	}
	
	
	public static void primesUntil50() {
		
		int add=0;
		
		for(int i=2; i<50; i++)
			if(isPrime(i))   	
				add +=i;
							
		System.out.println("add " + add);			
	}
	
	public static void firstPrimes50() {
		
		int i=1, c=1;
		double add=0;
		
		while(c <= 50) {			
			if(isPrime(i)) { 
				add +=i;				
				c++;
			}
			i++;
		}
		System.out.println("add " + add);
	}
	
	private static boolean isPrime(int i) {
		int c= 0;
		for(int x=1; x<i; x++) 
			if(i%x == 0) c++;
		
		return (c==1) ? true : false; 		
	}	
}