Я не понимаю в чем проблема
package com.javarush.task.task04.task0420;
import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.util.Arrays;
/*
Сортировка трех чисел
*/
public class Solution
{
public static void main(String[] args) throws Exception
{
BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));
int[] numbers = new int[3];
int i1 = Integer.parseInt(reader.readLine());
int i2 = Integer.parseInt(reader.readLine());
int i3 = Integer.parseInt(reader.readLine());
i1 = numbers[0];
i2 = numbers[1];
i3 = numbers[2];
Arrays.sort(numbers);
for (int i = numbers.length - 1; i >= 0; --i)
{
System.out.print(numbers[i] + " ");
}
}
}