Question

我只是Java的初学者，我正在尝试创建一个程序，显示多个对象的名称，年龄和出生年份。是否可以使用switch语句来获得这两个对象的出生年份？请把你的答案作为我的基本答案。谢谢。这是我的代码;

package PackageOne;
public class NewClass {

 static String name;
 static int age = 0;
  static int currentYear = 2015;
 static int birth;

 public static void main (String []args){

      NewClass person1 = new NewClass("Ichiro ", 15);
      NewClass person2 = new NewClass("Marie ", 21);
      person1.getInfo();
      person2.getInfo();
     birth = currentYear - age;

switch(birth){
    case 1: birth = 2000;
        break;
    case 2: birth = 2001; break;
    case 3: birth = 2002;break;
    default: System.out.println(birth);break;

}
 }
public NewClass(String x, int y){
   this.name = x;
   this.age = y;
}
public void getInfo(){
    System.out.println(name + age);
}
 }

Answer 1

你说这一切都错了......你的变量，类，包都应该是可读的和有代表性的。您也想使用封装和适当的方法。此外，您正在存储一个易于计算的字段。我真的不确定switch语句试图实现什么。

此外，使用类中的控制台将其绑定到输出，而是返回一个String并从main打印。

package com.denmark16;


public class Person {

      // Fields are private, and thus encapsulated
      private static String _name;
      private static int _age;


      // I'd put main in another class to make it tidier, but it's ok here
      public static void main (String []args){

          //By using a list, you can add as many people as you wish
          ArrayList<Person> people = new ArrayList<Person>();

          people.add(new Person("Ichiro ", 15));
          people.add(new Person("Marie ", 21));


      for (Person person in people) {
               System.Console.writeLine(getDetails(new DateTime().year()));
          }

     }


    // Not sure why you'd store age, I'm guessing it's an exercise, but really it should be Date of Birth
    public Person(String name, DateTime age){
       _name = name;
       _age = age;
    }


    // This should probably be a toString with hashCode
    public string getAllDetails(int year){
        return _name + " " + _age + " " + getYearOfBirth(new DateTime().getYear());
    }


    // This is flaky as really, we should store and calculate against the Date of Birth
    public int getYearOfBirth(int year) {
        return year - _age;     

    }

}

一个交换机中的多个对象;可能吗？

1 个答案: