构造器的调用顺序

class Meal{
Meal(){
System.out.println("Meal()");
}
}
class Bread{
Bread(){
System.out.println("Bread()");
}
}
class Cheese{
Cheese(){
System.out.println("Cheese()");
}
}
class Lettuce{
Lettuce(){
System.out.println("Lettuce()");
}
}
class Lunch extends Meal{
Lunch(){
System.out.println("Lunch()");
}
}
class PortableLunch extends Lunch{
PortableLunch(){
System.out.println("PortableLunch()");
}
}
public class Sandwich extends PortableLunch{
Bread b = new Bread();
Cheese c = new Cheese();
Lettuce l = new Lettuce();
Sandwich(){
System.out.println("Sandwich()");
}
public static void main(String[] args) {
new Sandwich();
}

}

结果：

Meal()
Lunch()
PortableLunch()
Bread()
Cheese()
Lettuce()
Sandwich()