Вроде все работает. Добавляет как надо и удаляет.
package com.javarush.task.task20.task2028;
import java.util.List;
public class Solution {
public static void main(String[] args) {
List<String> list = new CustomTree();
for (int i = 1; i < 16; i++) {
list.add(String.valueOf(i));
}
System.out.println("The list size is " + list.size());
System.out.println("The expected parent is 3. The actual parent is " + ((CustomTree) list).getParent("8"));
System.out.println("The expected parent is null. The actual parent is " + ((CustomTree) list).getParent("20"));
list.remove("3");
System.out.println("The expected parent is null. The actual parent is " + ((CustomTree) list).getParent("8"));
//for(int i = 0; i < list.size(); i++){
// System.out.println(list.get(i));
//}
// System.out.println(list.size());
list.add("16");
System.out.println("The expected parent is 9. The actual parent is " + ((CustomTree) list).getParent("16"));
list.remove("4");
list.remove("5");
list.remove("6");
// list.remove("1");
// list.remove("2");
// list.remove("4");
// list.remove("6");
System.out.println("Expected: true. Actual: " + list.add("20"));
System.out.println("The expected parent is 1. The actual parent is " + ((CustomTree) list).getParent("20"));
// System.out.println(list.size());
// list.add("21");
// System.out.println("The expected parent is 1. The actual parent is " + ((CustomTree) list).getParent("21"));
// list.add("22");
// System.out.println("The expected parent is 2. The actual parent is " + ((CustomTree) list).getParent("22"));
// list.add("23");
// System.out.println("The expected parent is 2. The actual parent is " + ((CustomTree) list).getParent("23"));
// list.add("24");
// System.out.println("The expected parent is 20. The actual parent is " + ((CustomTree) list).getParent("24"));
// list.add("25");
// System.out.println("The expected parent is 20. The actual parent is " + ((CustomTree) list).getParent("25"));
// list.add("26");
// System.out.println("The expected parent is 21. The actual parent is " + ((CustomTree) list).getParent("26"));
// for(int i = 0; i < list.size() + 1; i++){
// System.out.println(list.get(i));
// }
}
}
