JAVA 範例 ch09 Sample4

呼叫建構式

/*呼叫建構式*/
//車子類別
class Car
{
 private int num;
 private double gas;
 
 public Car()   //這是建構式的定義
 {
  num=0;
  gas=0;
  System.out.println("生產了車子。");
 }
 public void show()
 {
  System.out.println("車號是" + num + "。");
  System.out.println("汽油量是" + gas + "。");
 }
}

class Sample4
{
 public static void main(String[] args)
 {
  Car car1=new Car();   //只要建立新物件，就會自動呼叫建構式
  
  car1.show();
 }
}