我必须设计代码以在 Java 中按升序和降序返回一组无序整数

Question

I just started to code in Java using Eclipse. I am brand new to coding and need help trouble shooting my code. I must sort a set of integers in ascending and then descending order. Eclipse keeps giving me an error message saying "fw is never closed". What does this mean and how do I close fw?

Thanks in advance for any help.

package square;

import java.io.*;

public class Integers 
{
    public static void main(String[] args) throws IOException {
        int[] setOfInts = {28,3,53,4,89};
        int i, j, temp;
        FileWriter fw;
        fw = new FileWriter("sort_log.txt");
        System.out.println("Sort a set of Ints");
        
        fw.write("Unsorted set of ints\n");
        for (i=0; i<setOfInts.length; i++)
        {
            fw.write(setOfInts[i] + " ");
        }
        
        fw.write('\n');
            for (j=0; j<setOfInts.length; j++);
            {
                for (i=0; i<setOfInts.length-1-j; i++)
                { 
                    if (setOfInts[i] > setOfInts[i+1]) {
                        temp = setOfInts[i];
                        setOfInts[i] = setOfInts[i+1];
                        setOfInts[i+1] = temp;
                    }
            }
    }
    
    fw.write("Sorted set of ints\n");
    for (i=0; i<setOfInts.length; i++)
    {
        fw.write(setOfInts[i] + " ");
    }
        fw.close(); 
    }
}

Answer 1

In intellij that work for me, so...

For you sort you can do this:

public class Integers
{
    public static void main(String[] args) throws IOException {
        Integer[] setOfInts = {28,3,53,4,89};
        int i, j, temp;
        FileWriter fw;
        fw = new FileWriter("sort_log.txt");
        System.out.println("Sort a set of Ints");

        fw.write("Unsorted set of ints\n");
        for (i=0; i<setOfInts.length; i++)
        {
            fw.write(setOfInts[i] + " ");
        }

        fw.write('\n');
        Arrays.sort(setOfInts);

        fw.write("asc\n");
        for (i=0; i<setOfInts.length; i++)
        {
            fw.write(setOfInts[i] + " ");
        }

        fw.write('\n');
        Arrays.sort(setOfInts, Collections.reverseOrder());

        fw.write("desc\n");
        for (i=0; i<setOfInts.length; i++)
        {
            fw.write(setOfInts[i] + " ");
        }

        fw.close();
    }
}

I give you an advice Use thing that already exist , for example here i use Arrays.sort