planecs.java

java入门经典教程 java入门经典教程 java入门经典教程

// 例 2.7.2 PlaneCS.java
abstract class Plane
{
	private String model;  // 飞机型号
	protected abstract void fly();  // 起飞
	protected abstract void land();  // 降落
	protected void setModel(String model)  // 设置飞机型号
	{
		this.model = model;
	}
	protected String getModel()  // 获得飞机型号
	{
		return model;
	}
}
class Jet extends Plane
{
	protected Jet(String model)   // 初始化直升机的飞机型号
	{
		super.setModel(model);
	}
	protected void fly()  //  直升机起飞
	{
		System.out.println("Jet start to fly");
	}
	protected void land()  // 直升机降落
	{
		System.out.println("Jet prepare to land");
	}
}
class Copter extends Plane
{
	protected Copter(String model)  // 初始化喷气式飞机的型号
	{
		super.setModel(model);
	}
	protected void fly()   // 喷气式飞机起飞
	{
		System.out.println("Copter start to fly");
	}
	protected void land()  // 喷气式飞机降落
	{
		System.out.println("Copter prepare to land");
	}
}
public class PlaneCS  // Plane Control System
{
	static void controlFly(Plane plane)  // 控制飞机起飞的接口
	{
		plane.fly();
	}
	static void controlLand(Plane plane)  // 控制飞机降落的接口
	{
		plane.land();
	}
	static void printType(String model)
	{
		System.out.println("Type of plane is flying: "+model);
	}

	public static void main(String[] args)
	{
		Jet jet = new Jet("Jet0001");
		PlaneCS.controlFly(jet);
		PlaneCS.printType(jet.getModel());

		Copter copter = new Copter("Copter0006");
		PlaneCS.controlFly(copter);
		PlaneCS.printType(copter.getModel());

	    PlaneCS.controlLand(jet);
		PlaneCS.controlLand(copter);
	}
}