Код тестировала
Все вроде добавляет верно, во всех случаях.
Что ему не нравится?
package com.javarush.task.task19.task1916;
import java.io.BufferedReader;
import java.io.FileReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.ArrayList;
import java.util.LinkedHashSet;
import java.util.List;
import java.util.Set;
/*
Отслеживаем изменения
*/
public class Solution {
public static List<LineItem> lines = new ArrayList<LineItem>();
public static void main(String[] args) throws IOException {
BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));
String filename1 = reader.readLine();
String filename2 = reader.readLine();
reader.close();
ArrayList <String> arrayList1 = new ArrayList<>();
ArrayList <String> arrayList2 = new ArrayList<>();
BufferedReader reader1 = new BufferedReader(new FileReader(filename1));
while (reader1.ready()) {
String s1 = reader1.readLine();
arrayList1.add(s1);
}
reader1.close();
BufferedReader reader2 = new BufferedReader(new FileReader(filename2));
while (reader2.ready()) {
String s2 = reader2.readLine();
arrayList2.add(s2);
}
reader2.close();
ArrayList<String> arrayList3 = new ArrayList<>();
for (int i = 0; i < arrayList1.size() ; i++) {
arrayList3.add(arrayList1.get(i));
}
for (int i = 0; i < arrayList2.size() ; i++) {
arrayList3.add(arrayList2.get(i));
}
Set<String> set = new LinkedHashSet<>(arrayList3);
for (String text: set) {
boolean isinList1 = false;
boolean isinList2 = false;
String element = text;
for (int j = 0; j < arrayList1.size() ; j++) {
if (arrayList1.get(j).equals(element))
isinList1 = true;
}
for (int j = 0; j < arrayList2.size() ; j++) {
if (arrayList2.get(j).equals(element))
isinList2 = true;
}
if ((isinList1 == true) && (isinList2 == true)) {
LineItem item = new LineItem(Type.SAME,element);
lines.add(item);
}
if ((isinList1 == false) && (isinList2 == true)) {
LineItem item = new LineItem(Type.ADDED,element);
lines.add(item);
}
if ((isinList1 == true) && (isinList2 == false)) {
LineItem item = new LineItem(Type.REMOVED,element);
lines.add(item);
}
}
}
public static enum Type {
ADDED, //добавлена новая строка
REMOVED, //удалена строка
SAME //без изменений
}
public static class LineItem {
public Type type;
public String line;
public LineItem(Type type, String line) {
this.type = type;
this.line = line;
}
}
}