public static void main(String[] args) {
BufferedReader bf = null;
BufferedWriter bw = null;
try {
FileReader fr = new FileReader("File.txt");
FileWriter fw = new FileWriter("Output.txt");
bf = new BufferedReader(fr);
bw = new BufferedWriter(fw);
//Skip the first line
bf.readLine();
String line;
List<String> finalCheck = new ArrayList<String>();
//Read the file line by line and add the first number of each line (as a String) to the finalCheck List
while((line = bf.readLine()) != null){
String [] idArray = line.split(",");
String idCheck = idArray[0];
finalCheck.add(idCheck);
}
//Checking for any duplicates within the ID's and displaying them on
int i = 0;
int j = 0;
for (i = 0; i <= finalCheck.size(); i++) {
for (j = i + 1; j <= finalCheck.size(); j++) {
String [] array = new String[finalCheck.size()];
finalCheck.toArray(array);
if(array[i].equals(array[j])) { //This is Line 43
fw.write("Duplicate at line: " + array[i]);
}
}
}
} catch (FileNotFoundException e) {
e.printStackTrace();
System.err.println("File not found");
} catch (IOException e) {
System.err.println("Cannot read the file");
} finally {
try {
bf.close();
bw.flush();
bw.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
}
I keep getting the error message shown in the title, and I am not sure how to fix it. Any idea’s on what is going wrong to cause the issue? I added a note in the code to show exactly where Line 43 is, but if any additional information is needed please let me know and I will be more than happy to add it.
>Solution :
j <= finalCheck.size() should be j < finalCheck.size().
For an array of size x, In Java, the last index is x - 1 because arrays in Java start at index 0.