Что-то тут совсем не так
package com.javarush.task.task07.task0713;
import java.util.ArrayList;
import java.io.*;
public class Solution {
private static ArrayList<Integer> big = new ArrayList<Integer>();
private static ArrayList<Integer> two = new ArrayList<Integer>();
private static ArrayList<Integer> three = new ArrayList<Integer>();
private static ArrayList<Integer> rest = new ArrayList<Integer>();
public static void main(String[] args) throws Exception {
BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));
for (int i = 0; i < 20; i++) {
big.add(Integer.parseInt(reader.readLine()));
}
for (int i = 0; i < 20; i++) {
if (big.get(i) % 3 == 0 && big.get(i) % 2 == 0) {
two.add(big.get(i));
three.add(big.get(i));
}
else if (big.get(i) % 3 == 0)
three.add(big.get(i));
else if (big.get(i) % 2 == 0)
two.add(big.get(i));
else
rest.add(big.get(i));
}
for (int i = 0; i < 20; i++){
System.out.println(big.get(i));
}
printList(three);
printList(two);
printList(rest);
}
public static void printList(ArrayList<Integer> list) {
int th = three.size();
int tw = two.size();
int rt = rest.size();
for (int i = 0; i < th; i++) {
System.out.println(three.get(i));
}
for (int i = 0; i < tw; i++) {
System.out.println(two.get(i));
}
for (int i = 0; i < rt; i++) {
System.out.println(rest.get(i));
}
}
}