Match the most closest number

[jay lai]

I have a list of number, types is Double. I have a method to pass in the Double as params. I want to compare the input params with each of the values in the collection, if it matches the most closest value then return that value from the collection.

Collections<Double> list = new ArrayList<Double>();
list.add(89000.00);
list.add(78900.00);
list.add(56999.12);

so the method is like this

private Double getTheMatch(Double param) {
pseudo code:
for (Double d : list) {
if (param Match list.getNumber) {
return list.getNumber;
}
}
}

so if passing 88908.00 --> value will return will be 89000.00 , the most match value from the list

What API java class should I use? Thanks

[Jesper de Jong]

You can use a NavigableSet for this. Class TreeSet is an implementation of class NavigableSet. Example:

NavigableSet<Double> numbers = new TreeSet<Double>();
numbers.add(89000.0);
numbers.add(78900.0);
numbers.add(56999.12);

Double value = numbers.ceiling(88908.0);
System.out.println(value);

Note that the method ceiling returns the least element in the set greater than or equal to the given element (or null if there is no such element). There are other methods in the interface, such as floor, higher and lower. You'll have to read the documentation and decide which of these is appropriate for your application.