Template範例圖 by shumi

List1 AbstractDisplay類別

public abstract class AbstractDisplay{

   public abstract void open();

   public abstract void print();

   public abstract void close();

   public final void display(){
      open();
      for(int i = 0; i < 5; i++){
         print();
      }
      close();
   }
}

List2 CharDisplay類別

public class CharDisplay extends AbstractDisplay{
   private char ch;

   public CharDisplay(char ch){
      this.ch = ch;
   }

   public void open(){
      System.out.print("<<");
   }

   public void print(){
      System.out.print(ch);
   }

   public void close(){
      System.out.println(">>");
   }
}

List3 StringDisplay類別

public class StringDisplay extends AbstractDisplay{
   private String string;
   private int width;

   public StringDisplay(String string){
      this.string = string;
      this.width = string.getBytes().length;
   }

   public void open(){
      printLine();
   }

   public void print(){
      System.out.println("|" + string + "|");
   }

   public void close(){
      printLine();
   }

   private void printLine(){
      System.out.print("+");
      for(int i = 0; i < width; i++){
         System.out.print("-");
      }
      System.out.println("+");
   }
}

List4 Main類別

public class Main{

   public static void main(String[] args){
      AbstractDisplay d1 = new CharDisplay('H');
      AbstractDisplay d2 = new StringDisplay("Hello, world.");
      AbstractDisplay d3 = new StringDisplay("您好。");
      d1.display();
      d2.display();
      d3.display();
   }
}