Код не самый изящный, но должен работать вроде.
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 Exception {
BufferedReader bf = new BufferedReader(new InputStreamReader(System.in));
String file1 = bf.readLine();
String file2 = bf.readLine();
bf.close();
try{ BufferedReader reader1 = new BufferedReader(new FileReader(file1));
BufferedReader reader2 = new BufferedReader(new FileReader(file2));
ArrayList<String> list1 = new ArrayList<>();
while (reader1.ready()) {
list1.add(reader1.readLine());
}
ArrayList<String> list2 = new ArrayList<>();
while (reader2.ready()) {
list2.add(reader2.readLine());
}
reader1.close();
reader2.close();
Solution.makeSRAVN(list1,list2);
for (LineItem i: lines) {
System.out.println(i.type+" "+i.line);
}
}catch(FileNotFoundException e) {e.printStackTrace();}
}
public static void makeSRAVN(ArrayList<String> a, ArrayList<String> b) {
int j =0;
for (int i = 0; i <a.size();) {
if (a.get(i).equals(b.get(j))) {
lines.add(new LineItem(Type.SAME, a.get(i)));
i ++;
j ++;
} else if (j<b.size()-1 && (a.get(i).equals(b.get(j+1)))) {
lines.add(new LineItem(Type.ADDED, b.get(j)));
j ++;
} else {
lines.add(new LineItem(Type.REMOVED, a.get(i)));
i ++;
}
}
}
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;
}
@Override
public String toString() {
return type + " "+
line;
}
}
}