有沒有辦法從另一個文件中聲明私有 object？

Question

好吧，我真的找不到用語言表達的好方法。 有沒有辦法在公共 class 中聲明所有內容，但在不知道所有對象是什么的情況下在另一個文件/類中私下聲明？ 這是一個例子。

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.
    */
}

我已經四處搜索，但正如我所說，我無法弄清楚如何在不過於具體的情況下用它來表達。 目前，我必須編輯每個文件來更新我正在調用的單獨使用的內容。

Answer 1

你可以做的是在SomeOtherFile.java的構造函數中添加一個私有變量SetOfThings things; 你的代碼看起來像這樣

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
           }
    }

像這樣，您可以訪問SomeOtherFile.java中的SetOfThings.java 。 如果您的值沒有改變，您還可以選擇在SomeOtherFile中簡單地聲明一個SetOfThing object

SetOfThing myObjectInOtherClass=new SetOfThing();