入門 - 第2ステップ

// House.java という名前で保存
package com.foo;

import java.util.Arrays;
import java.util.LinkendList;
import java.util.List;

public class House {

	private Color			color;
	private Door			door;
	private List<IWindow>	windows	= new LinkendList<IWindow>();

	public House(Color color, Door door, IWindow... windows) {
		this.color = color;
		this.door = door;
		this.windows.addAll(Arrays.asList(windows));
	}

	public void repaint() {
		swapDoorHouseColor();
	}

	private void swapDoorHouseColor() {
		Color doorColor = door.getColor();
		door.repaint(color);
		color = doorColor;
	}

	public void addWindow(IWindow window) {
		windows.add(window);
	}

	public void replaceDoor(Door newDoor) {
		this.door = newDoor;
	}

	@Override
	public String toString() {
		return String.format(
				"This is a house painted in %s, has a %s door, and %d windows",
				color.getDescr(), door.getColor().getDescr(), windows.size());
	}
}

package com.foo;

public class HouseFactory {

	public static House basicHouse() {
		Door door = new Door(Color.WHITE);
		IWindow window = new RectangularWindow(2, 0.8);
		return new House(Color.WHITE, door, window);
	}

	public static House flashyHouse() {
		Door door = new Door(Color.random());
		IWindow window = new CircularWindow(1.2);
		return new House(Color.random(), door, window);
	}
}

package com.foo;

import java.util.Random;

public enum Color {

	BLACK("black"), BLUE("blue"), BROWN("brown"), GREEN("green"),
	ORANGE("orange"), RED("red"), WHITE("white"), YELLOW("yellow");

	public String	descr;

	private Color(String s) {
		descr = s;
	}

	public String getDescr() {
		return descr;
	}

	public static Color random() {
		Color[] allColors = values();
		return allColors[new Random().nextInt(values().length)];
	}
}

package com.foo;

public class Door {

	private Color	color;

	public Door(Color color) {
		this.color = color;
	}

	public Color getColor() {
		return color;
	}

	public void repaint(Color newColor) {
		color = newColor;
	}
}

package com.foo;

public interface IWindow {

	double getWindowArea();

}

package com.foo;

public class RectangularWindow implements IWindow {

	double	length;
	double	width;

	public RectangularWindow(double length, double width) {
		this.length = length;
		this.width = width;
	}

	public double getWindowArea() {
		return length * width;
	}
}

package com.foo;

public class CircularWindow implements IWindow {

	double	radius;

	public CircularWindow(double radius) {
		this.radius = radius;
	}

	public double getWindowArea() {
		return Math.PI * radius * radius;
	}
}

// この例はScilabディストリビューションに含まれます.
directory=SCI+"/modules/external_objects_java/examples/com/foo/"
// これらを全てコンパイルします
jcompile(ls(directory + "/*.java"))