draw a line from a larger point to a smaller

[m2faridi]

getEntryIndex in class DataSet.java have bug

When I draw a line from a larger point to a smaller one, this function cannot work well

  ArrayList<Entry> entries = new ArrayList<>();
     entries.add(new Entry(30, 10));
     entries.add(new Entry(20, 10));
     entries.add(new Entry(10, 10));

How can this problem be solved?