public class Test{
	static boolean p(int numero){
		for(int i=2; i<numero; i++) {
		     if (numero % i == 0)
		    	 return false;
		    }
		return true;
	     }
    public static void main(String[] args){
        java.util.Scanner scanner = new java.util.Scanner(System.in);
        System.out.println("Numeros primos hasta N:");
        java.util.ArrayList<Integer> integers = new java.util.ArrayList<Integer>();
        int n = scanner.nextInt();
        	for(int index=2;index<=n;index++){{
        		if(p(index)){
        			integers.add(index);
        			}
        		}
        	}
        	System.out.println(integers);
    }
}

import java.util.Scanner;
public class Test {
	static void vi(int array[], int request){
		boolean found = false;
		for(int j=0;j<array.length;j++){
			if(array[j]==request){
				array[j] = 0; found = true;
				System.out.println("Is OK");
			}
		}
		if(!found){
			System.err.println("Not Found: "+request);
		}
	}
	public static final int MAX = 4;
	public static void main(String[] args) {
		final Scanner scanner = new Scanner(System.in);
		int []array = new int[MAX];
		for(int index=0;index<array.length;index++){
			System.out.print("Element Nro["+index+"]"+": ");
			array[index] = scanner.nextInt();
		}
		System.out.println("-------------------------------");
		System.out.print("Remove value: ");
		int request = scanner.nextInt();
		vi(array,request);		
	}
}

Element Nro[0]: 30
Element Nro[1]: 2
Element Nro[2]: 3
Element Nro[3]: 10
-------------------------------
Remove value: 10
Is OK