CODEWITHSUNDEEP
javafilenio
kumarD
kumarD

Reputation: 594

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

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, i.e 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 ?

Upvotes: 0

Views: 69

Answers (1)

KishanCS
KishanCS

Reputation: 1377

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

Upvotes: 1

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