java语言描述 用抽象类模拟咖啡机的工作

 import java.util.Scanner;
 class Test {

     public static void main(String[] args) {
         coffee per = new coffee();
         per.shaoshui();
         per.receipt();
         per.custom();
         per.jiaoban();
         per.dicha();
     }
 }

     abstract  class beverage{
        private  void shaoshui(){
             System.out.println("烧开水");
     }
         abstract  void receipt();
       private  void jiaoban(){
             System.out.println("搅拌饮料");
         }

         void dicha(){
             System.out.println("给大佬递饮料");
         }
     }
     class coffee extends beverage{
           void shaoshui(){
             System.out.println("烧开水");

         }
          void receipt() {
              System.out.println("加一包秘制咖啡粉");
          }

          public static boolean custom(){

             System.out.println("需要加牛奶吗？");
             Scanner scanner=new Scanner(System.in);
             String str=scanner.nextLine();
             if(str.equalsIgnoreCase("y")){
                 System.out.println("加一包牛奶");
                 return true;
             }
             else if (str.equalsIgnoreCase("n")){
                 System.out.println("客户不需要加牛奶");
                 return false;
             }
             else{
                 System.out.println("非法输入");
                 return false;
             }

         }
         void jiaoban(){
             System.out.println("搅拌饮料");
         }
         void dicha(){
             System.out.println("给大佬递咖啡");
         }
     }

运行结果：