Question

I am trying to get all the values in an array that are below the BigDecimal value specified by the user. This is what I have so far:

class MyClass {
    public static void mymethod(BigDecimal[] values, BigDecimal uservalues) {
          for (int i = 0; i < values.length(); i++) {
              System.out.prinln(String.valueof(list.get(i)));
          }
    }
}

I’m not understanding the logic of how to do this.

So lets say values has the following values:

24.50
23.58
24.68
21.68
2.05
48.36

USER INPUT: 23

2.05
21.68

Hopefully my question is clear. Could anyone provide any tips?

Answer 1

Use NavigableSet.headSet 🙂

Returns a view of the portion of this set whose elements are strictly less than toElement.

This is likely an easier solution than manually iterating and using compareTo.

/* use this in place of an array */
final NavigableSet<BigDecimal> values = new TreeSet<BigDecimal>();
/* read from the user e.g. Scanner.nextBigDecimal() */
final BigDecimal ceiling = ...;
for (final BigDecimal lower : values.headSet(ceiling)) {
  /* lower will be less than ceiling */
}