OnJava8-Examples/serialization/AStoreCADState.java at master · CSapprenticeWT/OnJava8-Examples · GitHub

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// serialization/AStoreCADState.java

// We make no guarantees that this code is fit for any purpose.

// Visit http://OnJava8.com for more book information.

// Saving the state of a fictitious CAD system

import java.io.*;

import java.util.*;

import java.util.stream.*;

enum Color { RED, BLUE, GREEN }

abstract class Shape implements Serializable {

private int xPos, yPos, dimension;

Shape(int xVal, int yVal, int dim) {

xPos = xVal;

yPos = yVal;

dimension = dim;

}

public abstract void setColor(Color newColor);

public abstract Color getColor();

@Override public String toString() {

return "\n" + getClass() + " " + getColor() +

" xPos[" + xPos + "] yPos[" + yPos +

"] dim[" + dimension + "]";

}

private static Random rand = new Random(47);

private static int counter = 0;

public static Shape randomFactory() {

int xVal = rand.nextInt(100);

int yVal = rand.nextInt(100);

int dim = rand.nextInt(100);

switch(counter++ % 2) {

default:

case 0: return new Circle(xVal, yVal, dim);

case 1: return new Line(xVal, yVal, dim);

}

class Circle extends Shape {

Circle(int xVal, int yVal, int dim) {

super(xVal, yVal, dim);

}

private static Color color = Color.RED;

@Override public void setColor(Color newColor) {

color = newColor;

}

@Override public Color getColor() { return color; }

}

class Line extends Shape {

Line(int xVal, int yVal, int dim) {

super(xVal, yVal, dim);

}

private static Color color = Color.RED;

@Override public void setColor(Color newColor) {

color = newColor;

}

@Override public Color getColor() { return color; }

public static void

serializeStaticState(ObjectOutputStream os)

throws IOException {

os.writeObject(color);

}

public static void

deserializeStaticState(ObjectInputStream os)

throws IOException, ClassNotFoundException {

color = (Color)os.readObject();

}

public class AStoreCADState {

public static void main(String[] args) {

List<Class<? extends Shape>> shapeTypes =

Arrays.asList(Circle.class, Line.class);

List<Shape> shapes = IntStream.range(0, 5)

.mapToObj(i -> Shape.randomFactory())

.collect(Collectors.toList());

// Set all the static colors to GREEN:

shapes.forEach(s -> s.setColor(Color.GREEN));

// Serialize everything to CADState.dat:

try(

ObjectOutputStream out =

new ObjectOutputStream(

new FileOutputStream("CADState.dat"))

) {

out.writeObject(shapeTypes);

Line.serializeStaticState(out);

out.writeObject(shapes);

} catch(IOException e) {

throw new RuntimeException(e);

}

// Display the shapes:

System.out.println(shapes);

}

/* Output:

[

class Circle GREEN xPos[58] yPos[55] dim[93],

class Line GREEN xPos[61] yPos[61] dim[29],

class Circle GREEN xPos[68] yPos[0] dim[22],

class Line GREEN xPos[7] yPos[88] dim[28],

class Circle GREEN xPos[51] yPos[89] dim[9]]

OnJava8-Examples/serialization/AStoreCADState.java at master · CSapprenticeWT/OnJava8-Examples · GitHub

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