Java-examples

Phone.java

<geshi lang="java"> public class Phone { private double credit; Phone(double inCredit) { credit = inCredit; } public double getCredit() { return credit; } public void setCredit(double credit) { this.credit = credit; } public void call(double minute) { credit -= callCost(minute); } protected double callCost(double minute) { return 0; } } </geshi>

PrepaidPhone.java

public class PrepaidPhone extends Phone {

	PrepaidPhone(double inCredit) {
		super(inCredit);
	}

	protected double callCost(double minute) {
		if(minute <= 1)
			return 1;
		else
			return 1 + (minute - 1) * 0.5;
	}
}

PostpaidPhone.java

public class PostpaidPhone extends Phone {

	PostpaidPhone(double inCredit) {
		super(inCredit);
	}

	public double callCost(double minute) {
		return minute * 0.25;
	}
}