107 lines
3.3 KiB
Java
107 lines
3.3 KiB
Java
//: io/AStoreCADState.java
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// Saving the state of a pretend CAD system.
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import java.io.*;
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import java.util.*;
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abstract class Shape implements Serializable {
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public static final int RED = 1, BLUE = 2, GREEN = 3;
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private int xPos, yPos, dimension;
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private static Random rand = new Random(47);
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private static int counter = 0;
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public abstract void setColor(int newColor);
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public abstract int getColor();
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public Shape(int xVal, int yVal, int dim) {
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xPos = xVal;
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yPos = yVal;
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dimension = dim;
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}
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public String toString() {
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return getClass() +
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"color[" + getColor() + "] xPos[" + xPos +
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"] yPos[" + yPos + "] dim[" + dimension + "]\n";
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}
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public static Shape randomFactory() {
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int xVal = rand.nextInt(100);
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int yVal = rand.nextInt(100);
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int dim = rand.nextInt(100);
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switch(counter++ % 3) {
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default:
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case 0: return new Circle(xVal, yVal, dim);
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case 1: return new Square(xVal, yVal, dim);
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case 2: return new Line(xVal, yVal, dim);
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}
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}
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}
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class Circle extends Shape {
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private static int color = RED;
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public Circle(int xVal, int yVal, int dim) {
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super(xVal, yVal, dim);
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}
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public void setColor(int newColor) { color = newColor; }
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public int getColor() { return color; }
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}
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class Square extends Shape {
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private static int color;
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public Square(int xVal, int yVal, int dim) {
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super(xVal, yVal, dim);
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color = RED;
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}
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public void setColor(int newColor) { color = newColor; }
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public int getColor() { return color; }
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}
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class Line extends Shape {
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private static int color = RED;
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public static void
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serializeStaticState(ObjectOutputStream os)
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throws IOException { os.writeInt(color); }
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public static void
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deserializeStaticState(ObjectInputStream os)
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throws IOException { color = os.readInt(); }
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public Line(int xVal, int yVal, int dim) {
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super(xVal, yVal, dim);
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}
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public void setColor(int newColor) { color = newColor; }
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public int getColor() { return color; }
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}
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public class AStoreCADState {
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public static void main(String[] args) throws Exception {
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List<Class<? extends Shape>> shapeTypes =
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new ArrayList<>();
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// Add references to the class objects:
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shapeTypes.add(Circle.class);
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shapeTypes.add(Square.class);
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shapeTypes.add(Line.class);
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List<Shape> shapes = new ArrayList<>();
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// Make some shapes:
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for(int i = 0; i < 10; i++)
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shapes.add(Shape.randomFactory());
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// Set all the static colors to GREEN:
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for(int i = 0; i < 10; i++)
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((Shape)shapes.get(i)).setColor(Shape.GREEN);
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// Save the state vector:
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ObjectOutputStream out = new ObjectOutputStream(
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new FileOutputStream("CADState.out"));
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out.writeObject(shapeTypes);
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Line.serializeStaticState(out);
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out.writeObject(shapes);
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// Display the shapes:
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System.out.println(shapes);
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}
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} /* Output:
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[class Circlecolor[3] xPos[58] yPos[55] dim[93]
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, class Squarecolor[3] xPos[61] yPos[61] dim[29]
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, class Linecolor[3] xPos[68] yPos[0] dim[22]
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, class Circlecolor[3] xPos[7] yPos[88] dim[28]
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, class Squarecolor[3] xPos[51] yPos[89] dim[9]
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, class Linecolor[3] xPos[78] yPos[98] dim[61]
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, class Circlecolor[3] xPos[20] yPos[58] dim[16]
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, class Squarecolor[3] xPos[40] yPos[11] dim[22]
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, class Linecolor[3] xPos[4] yPos[83] dim[6]
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, class Circlecolor[3] xPos[75] yPos[10] dim[42]
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]
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*///:~
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