I am trying to skip the first and the last lines of a file and insert the rest of the information into an ArrayList. Here is what I have so farm to insert ALL elements from a file into an ArrayList.
CodonSequence cs = new CodonSequence();
try {
Scanner scanner = new Scanner(new File("testSequence.txt"));
while (scanner.hasNextLine()) {
cs.addNucleotide(scanner.nextLine());
}
} catch (FileNotFoundException e) {
e.printStackTrace();
}
Simply calling
scanner.nextLine();
once before any processing should do the trick.
At the end of your loop, do
Scanner.nextLine();
Easiest is probably to enclose your data collection inside an if statement to check if the scanner.next() is not null:
try {
Scanner scanner = new Scanner(new File("testSequence.txt"));
scanner.nextLine();//this would read the first line from the text file
while (scanner.hasNextLine()) {
if(!scanner.next().equals("")&&!scanner.next()==null){
cs.addNucleotide(scanner.nextLine());
}
}
} catch (FileNotFoundException e) {
e.printStackTrace();
}
ArrayList<String> arrayList = new ArrayList<String>();
BufferedReader reader = new BufferedReader(new FileReader(somepath));
reader.readLine(); // this will read the first line
String line1=null;
while ((line1 = reader.readLine()) != null){ //loop will run from 2nd line until the end
arrayList.add(scanner.nextLine());
}
Im not sure what your CodonSequence is, but if you stored the 2nd until the last line in an ArrayList, you just remove the last element:
arrayList.remove(arrayList.size() - 1);
A few searching won't hurt.
BufferedReader to skip first line
Java - remove last known item from ArrayList
Hope this helps.
I found a solution to my problem. I had to add:
scanner.nextLine();
before my while loop to skip the first line.