Почему IndexOutOfBoundsException?
package com.javarush.task.task19.task1916;
import javax.swing.plaf.basic.BasicButtonUI;
import java.io.BufferedReader;
import java.io.FileReader;
import java.io.InputStreamReader;
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 reader=new BufferedReader(new InputStreamReader(System.in));
BufferedReader freader1=new BufferedReader(new FileReader(reader.readLine()));
BufferedReader freader2=new BufferedReader(new FileReader(reader.readLine()));
while(freader1.ready() && freader2.ready()){
String first=freader1.readLine();
String second=freader2.readLine();
if(first.equals(second)){
lines.add(new LineItem(Type.SAME,first));
}
else {
if(lines.get(1)!=null && lines.get(1).type==Type.REMOVED){
lines.add(new LineItem(Type.ADDED,second));
}
else if (lines.get(1)!=null && lines.get(1).type==Type.ADDED){
lines.add(new LineItem(Type.REMOVED,first));
}
else {
lines.add(new LineItem(Type.REMOVED,first));
}
}
}
reader.close();
freader1.close();
freader2.close();
}
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;
}
}
}