public abstract class Rule {
	protected Software software;

	public void setSoftware(Software software) {
		this.software = software;
	}

	public static Rule getDefault(Software software) {
		MonthRule rule = new MonthRule();
		rule.setSoftware(software);
		return rule;
	}

	public abstract Buy getBuy();
}

public interface Buy {
	public void buy();
}

class NewlyRule extends Rule {
	public NewlyRule(Software software){
		this.software=software;
	}
	@Override
	public Buy getBuy() {
		if (software.isNewly()) {
			return new FreeRule(software).getBuy();
		} else {
			return new DateOffRule(software).getBuy();
		}
	}
}
class MonthRule extends Rule {
	@Override
	public Buy getBuy() {
		if (software.isMonth()) {
			return Buys.getBuy(Buys.IMMEDIATE);
		} else {
			return new NewlyRule(software).getBuy();
		}
	}
}
class FreeRule extends Rule {
	public FreeRule(Software software) {
		this.software = software;
	}

	public Buy getBuy() {
		if (software.isFree()) {
			return Buys.getBuy(Buys.IMMEDIATE);
		} else {
			return Buys.getBuy(Buys.NEW);
		}
	}
}
class DateOffRule extends Rule {
	public DateOffRule(Software software) {
		this.software = software;
	}
	@Override
	public Buy getBuy() {
		if (software.isDateOff()) {
			return Buys.getBuy(Buys.DATEOFF);
		} else {
			return Buys.getBuy(Buys.CONTINUE);
		}
	}
}

public class ContinueBuy implements Buy {
	public void buy() {
		System.out.println("还没到期,续订吗?");
	}
}
public class DateOffBuy implements Buy {
	public void buy() {
		System.out.println("你过期了,快续订");
	}
}
public class DefaultBuy implements Buy {
	public void buy() {
		System.out.println("这是默认处理");
	}
}
public class ImmediateBuy implements Buy {
	public void buy() {
		System.out.println("中奖了!直接开通!");
	}
}
public class NewBuy implements Buy {
	public void buy() {
		System.out.println("去新办手续吧");
	}
}

public static final String CONTINUE = "CONTINUE";
	public static final String DATEOFF = "DATEOFF";
	public static final String IMMEDIATE = "IMMEDIATE";
	public static final String NEW = "NEW";

	public static Buy getBuy(String type) {}

public class Software {
	private boolean free;
	private boolean month;
	private boolean newly;
	private boolean dateOff;
	//get/set
}

public class TestSoftware {
	@Test
	public void test() {
		Software software = new Software();
		Rule rule = Rule.getDefault(software);
		rule.getBuy().buy();
	}
}