Java範例程式 : 界面的多重繼承

類別 Car 實現界面 iVehicle 及 iMaterial, 類別 Plane 實現界面 iVehicle 及 iMaterial.

程式碼

interface iVehicle
{
 void vShow();
}

interface iMaterial
{
 void mShow();
}

class Car implements iVehicle,iMaterial
{
 private int num;
 private double gas;

 public Car(int n, double g)
 {
  num = n;
  gas = g;
  System.out.println("生產了編號 " + num + " 油量 " + gas + " 的汽車");
 }

 public void vShow()
 {
  System.out.print("這是編號 " + num + " 油量 " + gas + " 的汽車");
 }

 public void mShow()
 {
  System.out.print("材質是鋼鐵");
 }

 public void move(){
  System.out.print("在路上奔跑");
 }

 public String toString()
 {
  return "這是編號 " + num + " 油量 " + gas + " 的汽車 材質是鋼鐵";
 }
}

class Plane implements iVehicle,iMaterial
{
 private int flight;

 public Plane(int f)
 {
  flight = f;
  System.out.println("生產了編號 " + flight + " 的飛機");
 }

 public void vShow()
 {
  System.out.print("這是編號 " + flight + " 的飛機");
 }

 public void mShow()
 {
  System.out.print("材料是鋁合金");
 }

 public void move()
 {
  System.out.print("在天空飛行");
 }

 public String toString()
 {
  return "這是編號 " + flight + " 的飛機 材料是鋁合金";
 }
}

class C12P297
{
 public static void main(String[] args)
 {
  Car[] icar = new Car[3];
  for(int i = 0; i < icar.length; i++){
   icar[i] = new Car(i+1, 2000.0);
  }

  Plane[] iplane = new Plane[3];
  for(int i = 0; i < iplane.length; i++){
   iplane[i] = new Plane(i+1);
  }

  System.out.println("\n查詢生產成果");
  for(int i = 0; i < icar.length; i++){
   System.out.print("序號 " + i + "  ");
   icar[i].vShow();
   icar[i].mShow();
   System.out.print(" 移動方式 ");
   icar[i].move();
   System.out.print("\n");
   System.out.println("\t" + icar[i]);
   System.out.println("\t### " + icar[i].getClass() + " ### ");
  }

  for(int i = 0; i < iplane.length; i++){
   System.out.print("序號 " + i + "  ");
   iplane[i].vShow();
   iplane[i].mShow();
   System.out.print(" 移動方式 ");
   iplane[i].move();
   System.out.print("\n");
   System.out.println("\t" + iplane[i]);
   System.out.println("\t### " + iplane[i].getClass() + " ### ");
  }
 }
}