thinking_in_java/Detergent.java at master · java-tester-x/thinking_in_java · GitHub

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public class Detergent extends Cleanser {

    public void scrub() {
        append(" Detergent.scrub()");
        super.scrub();
    }

    public void foam() {
        append(" foam()");
    }

    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("Check the base class");
        Cleanser.main(args);
    }
}


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);
    }
}