Я что-то не так понял или делаю?)
package com.javarush.task.task07.task0713;
import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.util.ArrayList;
import java.util.Scanner;
/*
Играем в Jолушку
*/
public class Solution {
private static ArrayList<Integer> mainList = new ArrayList<>();
private static ArrayList<Integer> divedTwoList = new ArrayList<>();
private static ArrayList<Integer> divedThreeList = new ArrayList<>();
private static ArrayList<Integer> otherList = new ArrayList<>();
public static void main(String[] args) throws Exception {
Scanner scan = new Scanner(System.in);
for (int i = 0; i < 20; i++) {
mainList.add(i, scan.nextInt());
if(mainList.get(i) % 2 == 0) {
if(mainList.get(i) % 3 == 0) {
divedTwoList.add(mainList.get(i));
divedThreeList.add(mainList.get(i));
}else divedTwoList.add(mainList.get(i));
}
else if(mainList.get(i) % 3 == 0) divedThreeList.add(mainList.get(i));
else otherList.add(mainList.get(i));
}
printList(divedThreeList);
printList(divedTwoList);
printList(otherList);
}
public static void printList(ArrayList<Integer> list) {
for (Integer integer : list) {
System.out.println(integer);
}
}
}