Update code in lecture

src/se/edu/inclass/Main.java

@@ -9,43 +9,71 @@
 
 public class Main {
 
-    private TaskNameComparator taskNameComparator;
-
-    public static void main(String[] args) {
-        System.out.println("Welcome to Task (stream) manager\n");
-        DataManager dm = new DataManager("./data/data.txt");
-        ArrayList<Task> tasksData = dm.loadData();
-
-        printData(tasksData);
-        System.out.println();
-        System.out.println("Printing deadlines");
-        printDeadlines(tasksData);
-
-        System.out.println("Total number of deadlines: " + countDeadlines(tasksData));
-
-    }
-
-    private static int countDeadlines(ArrayList<Task> tasksData) {
-        int count = 0;
-        for (Task t : tasksData) {
-            if (t instanceof Deadline) {
-                count++;
-            }
-        }
-        return count;
-    }
-
-    public static void printData(ArrayList<Task> tasksData) {
-        for (Task t : tasksData) {
-            System.out.println(t);
-        }
-    }
-
-    public static void printDeadlines(ArrayList<Task> tasksData) {
-        for (Task t : tasksData) {
-            if (t instanceof Deadline) {
-                System.out.println(t);
-            }
-        }
-    }
+	private TaskNameComparator taskNameComparator;
+
+	public static void main(String[] args) {
+		System.out.println("Welcome to Task (stream) manager\n");
+		DataManager dm = new DataManager("./data/data.txt"); // data file
+		ArrayList<Task> tasksData = dm.loadData();//passing the file and put data in array list
+
+
+		System.out.println();
+		System.out.println("Printing deadlines");
+		printDeadlines(tasksData);
+
+		//System.out.println("Total number of deadlines: " + countDeadlines(tasksData));
+		System.out.println("Total number of deadlines using stream: " + countDeadlinesUsingStream(tasksData));
+		printData(tasksData);
+		printDataUsingStreams(tasksData);
+
+	}
+
+	private static int countDeadlines(ArrayList<Task> tasksData) {
+		int count = 0;
+		for (Task t : tasksData) {
+			if (t instanceof Deadline) {
+				count++;
+			}
+		}
+		return count;
+	}
+
+	private static int countDeadlinesUsingStream(ArrayList<Task> tasks){
+		int count = (int)tasks.stream() //instanceof Deadline - this is the checking point
+				.filter(t -> t instanceof Deadline)
+				.count();
+		return count;
+	}
+	public static void printData(ArrayList<Task> tasksData) {
+		System.out.println("Printing data using iteration");
+		for (Task t : tasksData) {
+			System.out.println(t);
+		}
+		//System.out.println(); sout
+	}
+
+	public static void printDataUsingStreams(ArrayList<Task> tasks) {
+		System.out.println("Printing data using stream");
+		tasks.stream()// convert in stream
+				.forEach(System.out::println); //referring the method and refer all the methods in the stream
+
+	}
+
+	public static void printDeadlines(ArrayList<Task> tasksData) {
+		System.out.println("print ddl using it.");
+		for (Task t : tasksData) {
+			if (t instanceof Deadline) {
+				System.out.println(t);
+			}
+		}
+	}
+
+	public static void printDeadlineUsingStream(ArrayList<Task> tasks){
+		System.out.println("Print DDL using stream");
+		tasks.stream() //instanceof Deadline - this is the checking point
+				.filter(t -> t instanceof Deadline) //predicate - boolean output //lamda function
+				.forEach(System.out::println);
+	}
 }
+
+

src/se/edu/inclass/data/DataManager.java

@@ -17,7 +17,7 @@ public class DataManager {
 
     public DataManager(String fileName) {
         dataFile = new File(fileName);
-    }
+    } //file class
 
     public File getDataFile() {
         return dataFile;
@@ -45,9 +45,10 @@ private ArrayList readFile() throws IOException {
         if (dataFile.length() == 0) {
             System.out.println("empty file");
             throw new IOException();
+            //
         }
         ArrayList<String> dataItems = (ArrayList) Files.readAllLines(dataFile.toPath(), Charset.defaultCharset());
-
+        //toPath() - get the file path // get all the line and close file
         return dataItems;
     }
 
@@ -57,7 +58,7 @@ public ArrayList<Task> loadData() {
             ArrayList<String> dataItems = readFile();
             taskList = parse(dataItems);
         } catch (IOException e) {
-            e.printStackTrace();
+            System.out.println("File access issues.");
         }
         return taskList;
     }