ArrayList, Getting values, from index() to index()
arraylist, java
Solution
Its easy done with a for-loop.
for(int i = startindex+1; i<endindex; i++) {
System.out.println(ArrayData.get(i));
}
This loop will print all objects in the arraylist that are between the given indices. But there is no method called get() which returns a collection of items that are between to given indices, you can only use the `subList(arg0, arg1)` method to creat a subcollection and then iterate over this subcollection. Take a look at the Docs http://docs.oracle.com/javase/6/docs/api/java/util/ArrayList.html#get%28int%29
Example:
List<String> al = new ArrayList<>();
al.add("a");
al.add("b");
al.add("c");
al.add("d");
List<String> sublist = al.subList(0, 3); //inclusive index 0, exclusive index 3
for(String s : sublist)
System.out.println(s);
Output: a, b, c
Problem
Hi everybody I am trying to get values from an ArrayList I created. I have some indexes, and I want to print the data ONLY between the indexes I want, so far I ave done this, but it does not seem to work. I think the get() is not valid for want I want... Any ideas? ``` public static void main(String[] args) throws Exception { Scanner dataSc = new Scanner(new FileReader("StudData1.txt")); ArrayList<String> ArrayData = new ArrayList<String>(); ArrayList<String> idData = new ArrayList<String>(); ArrayList<String> idIndex = new ArrayList<String>(); int b = 0; int a = 0; int i = 0; while (dataSc.hasNextLine()) { String data = dataSc.nextLine(); ArrayData.add(i, data); if (data.contains("ID: ")) { idData.add(a, data); idData.set(a, (idData.get(a).replaceAll("[\\D]", ""))); a++; b++; } i++; idIndex.add(b, Integer.toString(i)); } int idSt1 = Integer.parseInt(idData.get(0)); int idSt2 = Integer.parseInt(idData.get(1)); int idSt3 = Integer.parseInt(idData.get(2)); int idxID1 = Integer.parseInt(idIndex.get(0)); int idxID2 = Integer.parseInt(idIndex.get(1)); int idxId3 = Integer.parseInt(idIndex.get(2)); if (idSt1 < idSt2 && idSt2 < idSt3) { System.out.println(ArrayData.get(idxID1-3 , idxID2-3 );} } } ``` }