Что с ним не так?
package com.javarush.task.task19.task1916;
import java.io.*;
import java.util.ArrayList;
import java.util.List;
/*
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 file1 = reader.readLine();
String file2 = reader.readLine();
BufferedReader freader1 = new BufferedReader(new FileReader(file1));
BufferedReader freader2 = new BufferedReader(new FileReader(file2));
reader.close();
ArrayList<String> A = new ArrayList<>();
ArrayList<String> B = new ArrayList<>();
while (freader1.ready()){
A.add(freader1.readLine());
}
freader1.close();
while (freader2.ready()){
B.add(freader2.readLine());
}
freader2.close();
while(true){
if(A.size()==0 || B.size()==0) break;
if(A.get(0).equals(B.get(0))){
lines.add((new LineItem(Type.SAME,A.get(0))));
A.remove(0);
B.remove(0);
if(A.size()==0 || B.size()==0) break;
}
if(!A.get(0).equals(B.get(0))){
if(A.get(1).equals(B.get(0))){
lines.add(new LineItem(Type.ADDED,A.get(0)));
A.remove(0);
if(A.size()==0) break;
}
}
if(A.get(0).equals(B.get(1))){
lines.add(new LineItem(Type.REMOVED, B.get(0)));
B.remove(0);
if(B.size()==0) break;
}
}
for(String a :A){
lines.add(new LineItem(Type.REMOVED,A.get(0)));
}
for(String b :B){
lines.add(new LineItem(Type.ADDED,B.get(0)));
}
}
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;
}
}
}