Java 多态 polymorphic 枚举 练习
2021/7/9 17:12:44
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package ersatz; public class Car { private double temperature; public Car(double temperature) { this.temperature = temperature; } private class Air { public void tune() { if (temperature >= 40) { System.out.println("cold air"); } else if (temperature < 0) { System.out.println("warm air"); } else { System.out.println("nothing"); } } } public Air getAir() { return new Air(); } public static void main(String[] args) { final Car car = new Car(50); car.getAir().tune(); final Car car1 = new Car(-5); car1.getAir().tune(); final Car car2 = new Car(33); car2.getAir().tune(); } }
package ersatz; public class Car { private double temperature; public Car(double temperature) { this.temperature = temperature; } private class Air { public void tune() { if (temperature >= 40) { System.out.println("cold air"); } else if (temperature < 0) { System.out.println("warm air"); } else { System.out.println("nothing"); } } } public void regulate() { new Air().tune(); } public static void main(String[] args) { final Car car = new Car(50); car.regulate(); final Car car1 = new Car(-5); car1.regulate(); final Car car2 = new Car(33); car2.regulate(); } }
Vehicle.java
package com.gibe; public interface Vehicle { public abstract void work(); }
Horse.java
package com.gibe; public class Horse implements Vehicle{ @Override public void work(){ System.out.println("use horse"); } }
Boat.java
package com.gibe; public class Boat implements Vehicle{ @Override public void work(){ System.out.println("use boat"); } }
Plane.java
package com.gibe; public class Plane implements Vehicle{ @Override public void work() { System.out.println("use plane"); } }
VehicleFactory.java
package com.gibe; public class VehicleFactory { private static Horse horse = null; private static final Boat boat = new Boat(); private VehicleFactory() { } public static Horse getHorse() { if (horse == null) { horse = new Horse(); } return horse; } public static Boat getBoat() { return boat; } public static Plane getPlane() { return new Plane(); } }
Person.java
package com.gibe; public class Person { private String name; private Vehicle vehicle; public Person(String name, Vehicle vehicle) { this.name = name; this.vehicle = vehicle; } public void river() { if (!(this.vehicle instanceof Boat)) { vehicle = VehicleFactory.getBoat(); } vehicle.work(); } public void land() { if (!(vehicle instanceof Horse)) { vehicle = VehicleFactory.getHorse(); } vehicle.work(); } public void fire() { if (!(vehicle instanceof Plane)) { vehicle = VehicleFactory.getPlane(); } vehicle.work(); } }
Test
package ersatz; import com.gibe.Person; import com.gibe.VehicleFactory; public class Ersatz { @SuppressWarnings({"SpellCheckingInspection"}) public static void main(String[] args) { final Person bb = new Person("bb", VehicleFactory.getHorse()); bb.land(); bb.river(); bb.fire(); bb.river(); } }
package com.gibe; public class Ersatz { public static void main(String[] args) { Color green = Color.GREEN; green.show(); switch (green) { case YELLOW: System.out.println("yellow"); break; case BLACK: System.out.println("black"); break; default: System.out.println("none"); break; } } } enum Color implements Interface { RED(255, 0, 0), BLUE(0, 0, 255), BLACK(0, 0, 0), YELLOW(255, 255, 0), GREEN(0, 255, 0); private final int red; private final int green; private final int blue; private Color(int red, int green, int blue) { this.red = red; this.green = green; this.blue = blue; } @Override public void show() { System.out.println("red=" + red + ", green=" + green + ", blue=" + blue); } } interface Interface { public abstract void show(); }
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