Putting List In Sorted Order (Least To Greatest)

I am trying to make a code that takes a list and puts the list in sorted order (least to greatest).

public class SortedIntList {
static final int capacity = 10;
private int [] data;
private boolean unique;
private int size;
public SortedIntList(){
size =0;
data = new int [10];

[Code] ....

Here what the code produces.

Testing SortedIntList()
error when adding these values to list: 4 6 4
list should = [4, 4, 6]
actual list = [4, 6, 4]
was working properly prior to adding last value of 4