43 lines
1.1 KiB
Java
43 lines
1.1 KiB
Java
//: reusing/Detergent.java
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// Inheritance syntax & properties.
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import static net.mindview.util.Print.*;
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class Cleanser {
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private String s = "Cleanser";
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public void append(String a) { s += a; }
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public void dilute() { append(" dilute()"); }
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public void apply() { append(" apply()"); }
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public void scrub() { append(" scrub()"); }
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public String toString() { return s; }
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public static void main(String[] args) {
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Cleanser x = new Cleanser();
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x.dilute(); x.apply(); x.scrub();
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print(x);
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}
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}
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public class Detergent extends Cleanser {
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// Change a method:
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public void scrub() {
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append(" Detergent.scrub()");
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super.scrub(); // Call base-class version
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}
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// Add methods to the interface:
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public void foam() { append(" foam()"); }
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// Test the new class:
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public static void main(String[] args) {
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Detergent x = new Detergent();
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x.dilute();
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x.apply();
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x.scrub();
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x.foam();
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print(x);
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print("Testing base class:");
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Cleanser.main(args);
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}
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} /* Output:
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Cleanser dilute() apply() Detergent.scrub() scrub() foam()
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Testing base class:
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Cleanser dilute() apply() scrub()
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*///:~
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