import java.util.*;
public class Duplicate{
    public static boolean readDataAndDuplicate(int[] x){
        Scanner input = new Scanner(System.in);
        int i;
        System.out.print("Enter from 1 up to " + x.length + " integers; ");
        System.out.println("end with -999");
        for (i = 0; i < x.length; i++){
            System.out.print("Enter next integer value: ");
            x[i] = input.nextInt();
            if (x[i] == -999) break;
        }
        if (i == 0){
            System.out.println("Error: you must enter at least 1 element");
            System.exit(0);
        }


 boolean duplicates=false;
for (int j=0;j<x.length;j++)
  for (int k=0;k<x.length;k++)
    if (x[k]==x[j]){
      duplicates=true;
     }
    return false;
    public static void main(String[] args){
     readDataAndDuplicate()
    }
}
}