now using Stream and try-with-resources syntax

Sorting/RandomNumberFileReader.java

@@ -12,6 +12,17 @@ class RandomNumberFileReader{
 	private ArrayList<Integer> numbers = new ArrayList<Integer>();
 
 	public RandomNumberFileReader(String file){
+		//reads text from file of integers, one on each line
+		//uses try-with-resources loop to automatically close BufferedReader
+		//uses Stream operations instead of while loop
+		try(BufferedReader reader = Files.newBufferedReader(Path.of(file));){
+			reader.lines().mapToInt(Integer::parseInt).forEach(num -> numbers.add(num));
+		}catch (IOException ex){
+			System.err.println(ex);
+		}
+		
+		/*
+		//previous version retained for reference
 		//Reads in from a text file of integers, one on each line
 		try{
 			BufferedReader reader = Files.newBufferedReader(Path.of(file));
@@ -23,8 +34,9 @@ class RandomNumberFileReader{
 		} catch (IOException ex){
 			System.err.println(ex);
 		}
+		*/
 	}
-	
+
 	public ArrayList<Integer> getNumbers(){
 		return numbers;
 	}