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ThinkingInJava/reusingClasses/Exercise2.java at main · viktorvoltz/ThinkingInJava · GitHub

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class Cleanser {

private String s = "Cleanser";

public void append(String a) {

s += a;

}

public void dilute() {

append(" dilute()");

}

public void apply() {

append(" apply()");

}

public void scrub() {

append(" scrub()");

}

public String toString() {

return s;

}

public static void main(String[] args) {

Cleanser x = new Cleanser();

x.dilute();

x.apply();

x.scrub();

System.out.println(x);

}

}

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();

System.out.println(x);

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

Cleanser.main(args);

}

}

class Sterilizer extends Detergent {

public void scrub() {

append(" Sterilizer.scrub()");

super.scrub(); // calling base class

}

public void sterilize() {

append(" sterilize()");

}

public static void main(String[] args) {

Sterilizer x = new Sterilizer();

x.dilute();

x.apply();

x.scrub();

x.foam();

x.sterilize();

System.out.println(x);

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

Detergent.main(args);

}

}

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