?? cycles.java
字號:
// interfaces/Cycles.java
// TIJ4 Chapter Interfaces, Exercise 18, page 342
/* Create a Cycle interface, with implementations Unicycle, Bicycle and
* Tricycle. Create factories for each type of Cycle, and code that uses
* these factories.
*/
import static org.greggordon.tools.Print.*;
interface Cycle {
void ride();
}
interface CycleFactory {
Cycle getCycle();
}
class Unicycle implements Cycle {
public void ride() { println("Ride Unicycle"); }
}
class UnicycleFactory implements CycleFactory {
public Cycle getCycle() {
return new Unicycle();
}
}
class Bicycle implements Cycle {
public void ride() { println("Ride Bicycle"); }
}
class BicycleFactory implements CycleFactory {
public Cycle getCycle() {
return new Bicycle();
}
}
class Tricycle implements Cycle {
Tricycle() { println("Tricycle()"); }
public void ride() { println("Ride Tricycle"); }
}
class TricycleFactory implements CycleFactory {
public Cycle getCycle() {
return new Tricycle();
}
}
public class Cycles {
public static void rideCycle(CycleFactory factory) {
Cycle c = factory.getCycle();
c.ride();
}
public static void main(String [] args) {
rideCycle(new UnicycleFactory());
rideCycle(new BicycleFactory());
rideCycle(new TricycleFactory());
}
}
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