How to get uniq value from array

package java_practice;

import java.util.Arrays;
import java.util.Set;
import java.util.TreeSet;

public class Uniqvaluesfromarray {

public static void main(String[] args) {
// TODO Auto-generated method stub
Integer[] numbers = {1, 1, 2, 1, 3, 4, 5};
Set<Integer> uniqKeys = new TreeSet<Integer>();
uniqKeys.addAll(Arrays.asList(numbers));
System.out.println("uniqKeys: " + uniqKeys);
}

}

Output: uniqKeys: [1, 2, 3, 4, 5]