lab 13

2022-05-22 23:34:42 +08:00
parent d0416b02bd
commit a9f7967976
30 changed files with 904 additions and 0 deletions
--- a/lab/lab13/Question1/Model.java
+++ b/lab/lab13/Question1/Model.java
@@ -0,0 +1,106 @@
+import java.awt.Point;
+import java.util.ArrayList;
+import java.io.FileInputStream;
+import java.io.FileOutputStream;
+import java.io.IOException;
+import java.io.ObjectInputStream;
+import java.io.ObjectOutputStream;
+
+public class Model {
+	private ArrayList<Point> points;
+	private ArrayList<ModelListener> listeners;
+
+	public Model() {
+		points = new ArrayList<Point>();
+		listeners = new ArrayList<ModelListener>();
+
+		if (new java.io.File("points.bin").exists()) {
+			try {
+				FileInputStream fi = new FileInputStream("points.bin");
+				ObjectInputStream in = new ObjectInputStream(fi);
+				points = (ArrayList<Point>) in.readObject();
+				in.close();
+				fi.close();
+			} catch (IOException e) {
+				System.err.println(e.getMessage());
+				System.exit(1);
+			} catch (ClassNotFoundException e) {
+				System.err.println(e.getMessage());
+				System.exit(1);
+			}
+		}
+	}
+
+	public void addListener(ModelListener l) {
+		listeners.add(l);
+	}
+
+	public ArrayList<Point> getPoints() {
+		return points;
+	}
+
+	public void addPoint(Point p) {
+		points.add(p);
+		notifyListeners();
+	}
+
+	public void clearAllPoints() {
+		points.clear();
+		notifyListeners();
+	}
+
+	public void deleteLastPoint() {
+		if (points.size() > 0) {
+			points.remove(points.size() - 1);
+			notifyListeners();
+		}
+	}
+
+	private void notifyListeners() {
+		for (ModelListener l : listeners) {
+			l.update();
+		}
+	}
+
+	public int numberOfPoints() {
+		return points.size();
+	}
+
+	public void saveData() {
+
+		try {
+			FileOutputStream f = new FileOutputStream("points.bin");
+			ObjectOutputStream out = new ObjectOutputStream(f);
+			out.writeObject(points);
+			out.close();
+			f.close();
+		} catch (IOException e) {
+			System.err.println(e.getMessage());
+			System.exit(254);
+		}
+	}
+
+	public static void testModel() {
+		Model m = new Model();
+		m.addListener(new ModelListener() {
+			@Override
+			public void update() {
+				System.out.println(true + " (listener)");
+			}
+		});
+		System.out.println(m.getPoints() == m.points);
+		Point p1 = new Point(1, 2);
+		Point p2 = new Point(3, 4);
+		m.addPoint(p1);
+		m.addPoint(p2);
+		System.out.println(m.numberOfPoints() == 2);
+		System.out.println(m.points.get(0) == p1);
+		System.out.println(m.points.get(1) == p2);
+		m.deleteLastPoint();
+		System.out.println(m.numberOfPoints() == 1);
+		System.out.println(m.points.get(0) == p1);
+		m.clearAllPoints();
+		System.out.println(m.numberOfPoints() == 0);
+		m.notifyListeners();
+	}
+}