Reading all files within a directory Java ( assingning priroities to files )

Question

I am trying to read all files within a directory using java nio, i have the following directory structure

--dir1
  |
  -file1
  -file2
  -file3 

Now i need to make sure that file3 gets read first and then followed by file2 and then file1, ie i need to assign some priorities to the files and then read higher priority files first rather than the lower priority ones, how can i achieve this ?

Answer 1

You can use PriorityQueue as i have implimented that in simple way hope this solves your problem

public class Test
{
    public static void main(String[] args)
    {
        Comparator<String> comparator = new StringLengthComparator();
        PriorityQueue<String> queue = 
            new PriorityQueue<String>(10, comparator);
        queue.add("file3");
        queue.add("file1");
        queue.add("file2");
        while (queue.size() != 0)
        {
            System.out.println(queue.remove());
        }
    }
}

Hear i am comparing your condition using comparator

import java.util.Comparator;

    public class StringLengthComparator implements Comparator<String> {
        @Override
        public int compare(String x, String y) {
            if (x.equalsIgnoreCase("file3")) {
                return -1;
            }
            if (x.equalsIgnoreCase("file1")) {
                return 1;
            }
            return 0;
        }
    }

Assign your priorities as you like and read it .

Resulting

file3
file2
file1