// reuse/Detergent.java

// (c)2021 MindView LLC: see Copyright.txt

// We make no guarantees that this code is fit for any purpose.

// Visit http://OnJava8.com for more book information.

// Inheritance syntax & properties

class Cleanser {

private String s = "Cleanser";

public static void main(String[] args) {

Cleanser x = new Cleanser();

x.dilute();

x.apply();

x.scrub();

System.out.println(x);

}

public void append(String a) {

s += a;

}

public void dilute() {

append(" dilute()");

}

public void apply() {

append(" apply()");

}

public void scrub() {

append(" scrub()");

}

@Override

public String toString() {

return s;

}

}

public class Detergent extends Cleanser {

// Test the new class:

public static void main(String[] args) {

Detergent x = new Detergent();

x.dilute();

x.apply();

x.scrub();

x.foam();

System.out.println(x);

System.out.println("Testing base class:");

Cleanser.main(args);

}

// Change a method:

@Override

public void scrub() {

append(" Detergent.scrub()");

super.scrub(); // Call base-class version

}

// Add methods to the interface:

public void foam() {

append(" foam()");

}

}

/* Output:

Cleanser dilute() apply() Detergent.scrub() scrub()

foam()

Testing base class:

Cleanser dilute() apply() scrub()

*/