الگوی سازنده

public class StreetMap {
	private final Point origin;
	private final Point destination;

	private final Color waterColor;
	private final Color landColor;
	private final Color highTrafficColor;
	private final Color mediumTrafficColor;
	private final Color lowTrafficColor;
	
	public StreetMap(Point origin, Point destination, Color waterColor, Color landColor, Color highTrafficColor, Color mediumTrafficColor, Color lowTrafficColor) {
		// Required parameters
		this.origin      = origin;
		this.destination = destination;

		// Optional parameters
		this.waterColor         = waterColor;
		this.landColor          = landColor;
		this.highTrafficColor   = highTrafficColor;
		this.mediumTrafficColor = mediumTrafficColor;
		this.lowTrafficColor    = lowTrafficColor;
	}

	public static void main(String args[]) {
		
		StreetMap map = new StreetMap(new Point(50, 50), new Point(100, 100), Color.BLUE, Color.GRAY, Color.RED, Color.YELLOW, Color.GREEN);
	}
}

public class StreetMap {
	private final Point origin;
	private final Point destination;

	private final Color waterColor;
	private final Color landColor;
	private final Color highTrafficColor;
	private final Color mediumTrafficColor;
	private final Color lowTrafficColor;

	public static class Builder {
		// Required parameters
		private final Point origin;
		private final Point destination;

		// Optional parameters - initialize with default values
		private Color waterColor         = Color.BLUE;
		private Color landColor          = new Color(30, 30, 30);
		private Color highTrafficColor   = Color.RED;
		private Color mediumTrafficColor = Color.YELLOW;
		private Color lowTrafficColor    = Color.GREEN;

		public Builder(Point origin, Point destination) {
			this.origin      = origin;
			this.destination = destination;
		}

		public Builder waterColor(Color color) {
			waterColor = color;
			return this;
		}

		public Builder landColor(Color color) {
			landColor = color;
			return this;
		}

		public Builder highTrafficColor(Color color) {
			highTrafficColor = color;
			return this;
		}

		public Builder mediumTrafficColor(Color color) {
			mediumTrafficColor = color;
			return this;
		}

		public Builder lowTrafficColor(Color color) {
			lowTrafficColor = color;
			return this;
		}

		public StreetMap build() {
			return new StreetMap(this);
		}

	}

	private StreetMap(Builder builder) {
		// Required parameters
		origin      = builder.origin;
		destination = builder.destination;

		// Optional parameters
		waterColor         = builder.waterColor;
		landColor          = builder.landColor;
		highTrafficColor   = builder.highTrafficColor;
		mediumTrafficColor = builder.mediumTrafficColor;
		lowTrafficColor    = builder.lowTrafficColor;
	}

	public static void main(String args[]) {
		StreetMap map = new StreetMap.Builder(new Point(50, 50), new Point(100,
				100)).landColor(Color.GRAY).waterColor(Color.BLUE.brighter())
				.build();
	}
}