使用用户输入来创建新对象[JAVA]

使用您提供的限制信息，我尝试解决此问题：

1. 我没有在Desktop和Laptop类中添加任何属性，在两个类中都覆盖了toString方法，即

    public class Laptop {        public String toString() { return "Laptop [getClass()=" + getClass() + ", hashCode()="         + hashCode() + ", toString()=" + super.toString() + "]";        }    }    public class Desktop {        public String toString() { return "Desktop [getClass()=" + getClass() + ", hashCode()="         + hashCode() + ", toString()=" + super.toString() + "]";        }    }

您的Main方法如下所示：

public static void main (String args[])     {        String input;        Scanner scanner = new Scanner(System.in);        List<Object> listOfObject = new ArrayList<>();        do        { System.out.println("Computer Menu");   System.out.println("1. Add a new Desktop Information"); System.out.println("2. Add a new Laptop Information"); System.out.println("3. Display all Computer Information"); System.out.println("4. Quit"); System.out.print("Please enter either 1 to 4: ");  input =(scanner.nextLine()); if (input.equals("1")){     Desktop desktop1 = new Desktop();     listOfObject.add(desktop1); }else if (input.equals("2")){     Laptop laptop1 = new Laptop();     listOfObject.add(laptop1);  }else if(input.equals("3")){      for(Object obj : listOfObject){          if(obj instanceof Desktop){  Desktop d1 = (Desktop)obj;  System.out.println(d1.toString());          }else if(obj instanceof Laptop){   Laptop l1 = (Laptop)obj;   System.out.println(l1.toString());          }      }  }        }while(!input.equals("4"));    }