Shape.java Source code

Introduction

Here is the source code for Shape.java

Source

// : c12:CADState.java
// Saving and restoring the state of a pretend CAD system.
// {Clean: CADState.out}
//package c12;
// From 'Thinking in Java, 3rd ed.' (c) Bruce Eckel 2002
// www.BruceEckel.com. See copyright notice in CopyRight.txt.

import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.Serializable;
import java.util.ArrayList;
import java.util.List;
import java.util.Random;

abstract class Shape implements Serializable {
    public static final int RED = 1, BLUE = 2, GREEN = 3;

    private int xPos, yPos, dimension;

    private static Random r = new Random();

    private static int counter = 0;

    public abstract void setColor(int newColor);

    public abstract int getColor();

    public Shape(int xVal, int yVal, int dim) {
        xPos = xVal;
        yPos = yVal;
        dimension = dim;
    }

    public String toString() {
        return getClass() + "color[" + getColor() + "] xPos[" + xPos + "] yPos[" + yPos + "] dim[" + dimension
                + "]\n";
    }

    public static Shape randomFactory() {
        int xVal = r.nextInt(100);
        int yVal = r.nextInt(100);
        int dim = r.nextInt(100);
        switch (counter++ % 3) {
        default:
        case 0:
            return new Circle(xVal, yVal, dim);
        case 1:
            return new Square(xVal, yVal, dim);
        case 2:
            return new Line(xVal, yVal, dim);
        }
    }
}

class Circle extends Shape {
    private static int color = RED;

    public Circle(int xVal, int yVal, int dim) {
        super(xVal, yVal, dim);
    }

    public void setColor(int newColor) {
        color = newColor;
    }

    public int getColor() {
        return color;
    }
}

class Square extends Shape {
    private static int color;

    public Square(int xVal, int yVal, int dim) {
        super(xVal, yVal, dim);
        color = RED;
    }

    public void setColor(int newColor) {
        color = newColor;
    }

    public int getColor() {
        return color;
    }
}

class Line extends Shape {
    private static int color = RED;

    public static void serializeStaticState(ObjectOutputStream os) throws IOException {
        os.writeInt(color);
    }

    public static void deserializeStaticState(ObjectInputStream os) throws IOException {
        color = os.readInt();
    }

    public Line(int xVal, int yVal, int dim) {
        super(xVal, yVal, dim);
    }

    public void setColor(int newColor) {
        color = newColor;
    }

    public int getColor() {
        return color;
    }
}

public class CADState {
    public static void main(String[] args) throws Exception {
        List shapeTypes, shapes;
        if (args.length == 0) {
            shapeTypes = new ArrayList();
            shapes = new ArrayList();
            // Add references to the class objects:
            shapeTypes.add(Circle.class);
            shapeTypes.add(Square.class);
            shapeTypes.add(Line.class);
            // Make some shapes:
            for (int i = 0; i < 10; i++)
                shapes.add(Shape.randomFactory());
            // Set all the static colors to GREEN:
            for (int i = 0; i < 10; i++)
                ((Shape) shapes.get(i)).setColor(Shape.GREEN);
            // Save the state vector:
            ObjectOutputStream out = new ObjectOutputStream(new FileOutputStream("CADState.out"));
            out.writeObject(shapeTypes);
            Line.serializeStaticState(out);
            out.writeObject(shapes);
        } else { // There's a command-line argument
            ObjectInputStream in = new ObjectInputStream(new FileInputStream(args[0]));
            // Read in the same order they were written:
            shapeTypes = (List) in.readObject();
            Line.deserializeStaticState(in);
            shapes = (List) in.readObject();
        }
        // Display the shapes:
        System.out.println(shapes);
    }
} ///:~