public class Plate {
   public Plate(int i){
           System.out.println("Plate constructor");     } }

public class DinnerPlate extends Plate {
   public DinnerPlate(int i){
   super(i);         System.out.println("DinnerPlage constructor");     } }

public class Utensil {
   public Utensil(int i){
           System.out.println("Utensil constructor");     } }

public class Spoon extends Utensil {
   public Spoon(int i){
   super(i);         System.out.println("Spoon constructor");     } }

public class Fork extends Utensil {
   public Fork(int i){
   super(i);         System.out.println("Fork constructor");     } }

public class Knife extends Utensil {
   public Knife(int i){
   super(i);         System.out.println("Knife constructor");     } }

public class Custom {
   public Custom(int i){
           System.out.println("Custom constructor");     } }

public class PlaceSetting extends Custom {
   //继承     Spoon spoon;//组合     Knife knife;//组合     Fork fork;//组合     DinnerPlate dPlate;//组合     public PlaceSetting(int i){
   super(i + 2);//先初始化父类                 spoon = new Spoon(i + 3);//再初始化组合类         knife = new Knife(i + 4);//再初始化组合类         fork = new Fork(i + 5);//再初始化组合类         dPlate = new DinnerPlate(i + 6);//再初始化组合类                 System.out.println("PlaceSetting constructor");     } public static void main(String args[]){
   new PlaceSetting(666);     } } //总之，先初始化父类，再初始化组合类，如果组合类同样有父类，也会先初始化，最后初始化自己