有没有办法从另一个文件中声明私有 object？

Question

好吧，我真的找不到用语言表达的好方法。 有没有办法在公共 class 中声明所有内容，但在不知道所有对象是什么的情况下在另一个文件/类中私下声明？ 这是一个例子。

SetOfThings.java

public class SetOfThings {
   // For the sake of the question, say these can change
   // from time to time
   public int someNumber = 1;
   public string someString = "Java is kinda challenging sometimes...";
   public Joystick example = new Joystick(someNumber);
}

SomeOtherFile.java

public class SomeOtherFile {
   /** Some way to recreate all the public objects from 
    * SetOfThings with the same values, but private 
    * (perhaps final, too?) and without having to 
    * know what all the objects in SetOfThings are.
    */
}

我已经四处搜索，但正如我所说，我无法弄清楚如何在不过于具体的情况下用它来表达。 目前，我必须编辑每个文件来更新我正在调用的单独使用的内容。

Answer 1

你可以做的是在SomeOtherFile.java的构造函数中添加一个私有变量SetOfThings things; 你的代码看起来像这样

SetOfThings.java

    public class SetOfThings {
   // For the sake of the question, say these can change
   // from time to time
   public int someNumber = 1;
   public string someString = "Java is kinda challenging sometimes...";
   public Joystick example = new Joystick(someNumber);
}

SomeOtherFile.java

    public class SomeOtherFile {
           private SetOfThings setOfThings; //this is so you can access all the SetOfThings variables
           public SomeOtherFile(SetOfThings things){
                this.setOfThings=things //attribute things to the private variable
           }
    }

像这样，您可以访问SomeOtherFile.java中的SetOfThings.java 。 如果您的值没有改变，您还可以选择在SomeOtherFile中简单地声明一个SetOfThing object

SetOfThing myObjectInOtherClass=new SetOfThing();