Java - ayuda java

package loteria;

import java.io.IOException;

import java.util.Arrays;

import java.util.Random;

import java.util.Scanner;

public class loteria4 {

public static void main(String[]args) throws IOException {

	Scanner in = new Scanner(System.in);

	int nr[];

	int n,i;

	Random r=new Random();

	do {

		System.out.println("Ingrese cantidad de numeros:");

		n=in.nextInt();

	}while(n<0 || n>50);

	nr=new int[n];

	   for(i=0; i<n; i++)

	     {

	       System.out.print(""+nr[i]+ "");

	       nr[i]=in.nextInt();

	     }

	     Arrays.sort(nr);

	     System.out.println("El orden de los numeros:");

	     for ( i=0; i<nr.length; i++){

	    	 System.out.println(""+ nr[i]+ "");

}

	     System.out.println("Numeros juntos -> " + nr [ r.nextInt ( 5) ]  + nr [ r.nextInt (  5) ] + nr [ r.nextInt (  5) ] );

}

}

import java.util.Scanner;

import java.util.Random;

public class Llenar3{

public static void main(String[]args){

Random random = new Random();

int [] arreglo = new int[7];

int [] comb = new int [3];

Scanner in = new Scanner(System.in);

int n;

System.out.println("ingrese nr");

for (int i=0; i<arreglo.length;i++){

	System.out.println("valor: " +(i+1));

 arreglo[i]=in.nextInt();

}

 System.out.println("combinacion");

        for(int i = 0; i < arreglo.length; i++){

				System.out.println(arreglo[i]);

                if(comb[i] == arreglo[i] ){

             }

         }

}

}