49 lines
1.3 KiB
Java
49 lines
1.3 KiB
Java
// reuse/Detergent.java
|
|
// (c)2017 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 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 static void main(String[] args) {
|
|
Cleanser x = new Cleanser();
|
|
x.dilute(); x.apply(); x.scrub();
|
|
System.out.println(x);
|
|
}
|
|
}
|
|
|
|
public class Detergent extends Cleanser {
|
|
// 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()"); }
|
|
// 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);
|
|
}
|
|
}
|
|
/* Output:
|
|
Cleanser dilute() apply() Detergent.scrub() scrub()
|
|
foam()
|
|
Testing base class:
|
|
Cleanser dilute() apply() scrub()
|
|
*/
|