detergent.java

Java例程

//: Detergent.java
// Inheritance syntax & properties

class Cleanser {
	private String s = new String("Cleanser");
	public void append(String a) { s += a; }
	public void dilute() { append(" dilute()"); }
	public void apply() { append(" apply()"); }
	public void scrub() { append(" scrub()"); }
	public void print() { System.out.println(s); }
	public static void main(String[] args) {
		Cleanser x = new Cleanser();
		x.dilute();
		x.apply();
		x.scrub();
		x.print();
	}
}

public class Detergent extends Cleanser {
	//	Change a method:
	public void scrub() {
		append(" Detergent.scrub()");
		super.scrub();		//	call base-class version
	}
	//	Add methods to the interface:
	public void foam() { append(" foam()"); }
	//	Test the new class
	public static void main(String[] args) {
		Detergent x = new Detergent();
		x.dilute();
		x.apply();
		x.scrub();
		x.foam();
		x.print();
		System.out.println("Testing base class:");
		Cleanser.main(args);
	}
}