ЛР3. Задание 1

src/tse/LR_3.java

@@ -1,5 +1,7 @@
 package tse;
 
+import tse.lr3.LR_3_Tasks;
+
 /**
  * @author aNNiMON
  */
@@ -17,6 +19,7 @@ public class LR_3 implements ILabRab {
     public void execute(int index) {
         switch(index) {
             case 0:
+                LR_3_Tasks.getInstance().task1();
                 break;
             case 1:
                 break;

src/tse/lr2/Circle.java

@@ -1,12 +1,15 @@
 package tse.lr2;
 
 import java.awt.Point;
+import java.io.Serializable;
 
 /**
  *
  * @author aNNiMON
  */
-public class Circle extends Ellipse {
+public class Circle extends Ellipse implements Serializable {
+    
+    private static final long serialVersionUID = 1L;
     
     public Circle() {
         super();

src/tse/lr2/Ellipse.java

@@ -1,14 +1,16 @@
 package tse.lr2;
 
 import java.awt.Point;
+import java.io.Serializable;
 import java.util.Arrays;
 
 /**
  *
  * @author aNNiMON
  */
-public class Ellipse {
+public class Ellipse implements Serializable {
     
+    private static final long serialVersionUID = 1L;
     private static final int POINTS = 4;
     
     protected final Point[] points;
@@ -78,14 +80,14 @@ public class Ellipse {
 
     @Override
     public String toString() {
-        /*StringBuilder sb = new StringBuilder();
+        StringBuilder sb = new StringBuilder();
         for (int i = 0; i < POINTS; i++) {
             sb.append(points[i].toString()).append('\t');
         }
         sb.append("\nSquare: ").append(getSquare());
         sb.append("\nCenter: ").append(getCenterPoint().toString());
-        return sb.toString();*/
+        return sb.toString();
-        return "Я - Эллипс";
+        // return "Я - Эллипс";
     }
     
 }

src/tse/lr3/LR_3_Tasks.java

@@ -0,0 +1,106 @@
+package tse.lr3;
+
+import tse.lr2.*;
+import java.awt.Point;
+import java.io.FileInputStream;
+import java.io.FileOutputStream;
+import java.io.IOException;
+import java.io.ObjectInputStream;
+import java.io.ObjectOutputStream;
+import java.util.ArrayList;
+import java.util.List;
+
+/**
+ *
+ * @author aNNiMON
+ */
+public class LR_3_Tasks {
+    
+    private static LR_3_Tasks instance;
+    
+    public static synchronized LR_3_Tasks getInstance() {
+        if (instance == null) instance = new LR_3_Tasks();
+        return instance;
+    }
+    
+    private Ellipse ellipse1, ellipse2, ellipse3;
+    private Circle circle1, circle2;
+    
+    public void task1() {
+        makeObjects();
+        System.out.println("До сериализации");
+        System.out.println(ellipse1.toString());
+        serialize("t1_ellipse.ser", ellipse1);
+        
+        Ellipse el = (Ellipse) deserialize("t1_ellipse.ser");
+        if (el != null) {
+            System.out.println("После сериализации");
+            System.out.println(el.toString());
+        }
+        System.out.println("Готово!");
+    }
+
+    public void task2() {
+        makeObjects();
+        ArrayList<Ellipse> ellipses = new ArrayList<>();
+        ellipses.add(ellipse1);
+        ellipses.add(ellipse2);
+        ellipses.add(ellipse3);
+        ellipses.add(circle1);
+        ellipses.add(circle2);
+        printList(ellipses);
+    }
+    
+    public void task5() {
+        makeObjects();
+    }
+    
+    private void makeObjects() {
+        ellipse1 = new Ellipse(
+                new Point(2, 2), new Point(8, 2),
+                new Point(2, 6), new Point(8, 6)
+        );
+        ellipse2 = new Ellipse(
+                new Point(0, -4), new Point(20, -4),
+                new Point(0, 12), new Point(20, 12)
+        );
+        ellipse3 = new Ellipse(ellipse1);
+        
+        circle1 = new Circle( new Point(3, 3),  6 );
+        circle2 = new Circle( new Point(5, 4),  2 );
+    }
+    
+    private void serialize(String filename, Object object) {
+        try {
+            FileOutputStream fos = new FileOutputStream(filename);
+            ObjectOutputStream oos = new ObjectOutputStream(fos);
+            oos.writeObject(object);
+            oos.close();
+            fos.close();
+        } catch (IOException ex) {
+            ex.printStackTrace();
+        }
+    }
+    
+    private Object deserialize(String filename) {
+        Object object = null;
+        try {
+            FileInputStream fis = new FileInputStream(filename);
+            ObjectInputStream ois = new ObjectInputStream(fis);
+            object = ois.readObject();
+            ois.close();
+            fis.close();
+        } catch (IOException | ClassNotFoundException ex) {
+            ex.printStackTrace();
+        }
+        return object;
+    }
+    
+    private void printList(List<Ellipse> list) {
+        for (int i = 0; i < list.size(); i++) {
+            Ellipse ellipse = list.get(i);
+            System.out.println( String.format("%2d. %f", i + 1, ellipse.getSquare()) );
+        }
+    }
+
+}