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                  @Component({
                      selector: 'base-listbox',
                      template: `
                      `,
                      host: {
                        '(keydown)': 'handleKey($event)',
                      },
                    })
                    export class ListboxBase {
                      @Input() value: string;
                      handleKey(event: KeyboardEvent) {
                      }
                    }
                    @Component({
                      selector: 'custom-listbox',
                      template: `
                      `,
                      host: {
                        '(click)': 'focusActiveOption()',
                      },
                    })
                    export class CustomListbox extends ListboxBase {
                      @Input() disabled = false;
                      focusActiveOption() {
                      }
                    }
                    @Component({
                      selector: 'base-listbox',
                      template: `
                      `,
                      host: {
                        '(keydown)': 'handleKey($event)',
                      },
                    })
                    export class ListboxBase {
                      @Input() value: string;
                      handleKey(event: KeyboardEvent) {
                      }
                    }
                    @Component({
                      selector: 'custom-listbox',
                      template: `
                      `,
                      host: {
                        '(click)': 'focusActiveOption()',
                      },
                    })
                    export class CustomListbox extends ListboxBase {
                      @Input() disabled = false;
                      focusActiveOption() {
                      }
                    }
          
          
      
      

          

            
              package Cloudin;

              import java.util.ArrayList;
              import java.util.List;

              public class DecoratorExample {

                  public static void main(String[] args) {
                      List items = new ArrayList<>();
                      items.add("Item1");
                      items.add("Item2");
                      items.add("Item3");

                      ShoppingCart cart = new ShoppingCart();
                      for (String item : items) {
                          cart.addItem(new Product(item, 10.0));
                      }

                      System.out.println("Total price: $" + cart.calculateTotal());

                      cart.setDiscount(new PercentageDiscount(10));
                      System.out.println("Total price after discount: $" + cart.calculateTotal());
                  }
              }

              class Product {
                  private String name;
                  private double price;

                  public Product(String name, double price) {
                      this.name = name;
                      this.price = price;
                  }

                  public double getPrice() {
                      return price;
                  }
              }

              class ShoppingCart {
                  private List items;
                  private Discount discount;

                  public ShoppingCart() {
                      items = new ArrayList<>();
                  }

                  public void addItem(Product product) {
                      items.add(product);
                  }

                  public void setDiscount(Discount discount) {
                      this.discount = discount;
                  }

                  public double calculateTotal() {
                      double total = 0.0;
                      for (Product item : items) {
                          total += item.getPrice();
                      }

                      if (discount != null) {
                          total -= discount.applyDiscount(total);
                      }

                      return total;
                  }
              }

              interface Discount {
                  double applyDiscount(double totalAmount);
              }

              class PercentageDiscount implements Discount {
                  private double percentage;

                  public PercentageDiscount(double percentage) {
                      this.percentage = percentage;
                  }

                  @Override
                  public double applyDiscount(double totalAmount) {
                      return totalAmount * (percentage / 100);
                  }
              }

          
          
        
  

走出传统的框架，定制我们的未来。

Breaking from tradition, crafting our future.

伝統的な枠組みを超え、未来をカスタマイズする。