字符串作为新类的唯一私有字段

发布于 2024-10-15 14:59:54 字数 143 浏览 6 评论 0原文

这里的一般问题:如果我正在创建一个新类,并且它的唯一私有字段是一个字符串,我可以在构造函数中执行类似 this.privateString = argumentIn; 的操作来设置该私有字段吗?我只是累了,因为我不擅长 java 的整个引用部分。

General question here: If I'm making a new class, and it's only private field is a string, can I do something like this.privateString = argumentIn; in the constructor to set that private field? I'm just weary since I'm not good with the whole referencing part of java.

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下壹個目標 2024-10-22 14:59:54

,因此私有字段的定义只能从类本身内部访问。

作为提示,如果没有任何访问器,这可能会使此类的对象几乎毫无用处。

Yes, and thus the definition of a private field being only accessible from within the class itself.

And as a tip, without any accessors, this may render your objects of this class mostly useless.

記憶穿過時間隧道 2024-10-22 14:59:54

确实。考虑这个例子。我添加了一些基本的防御性复制练习。

/**
* MyClass is an immutable class, since there is no way to change
* its state after construction.
*/

public final class MyClass{

private final String myString;

public MyClass(String myString){
   this.myString = myString;
}

 /**
  * Returns an immutable object. String is immutable.
  *
  */

public String getMyString(){
   return myString;
}

//no need to provide a setter to keep myString as immutable after initial state
}

考虑阅读 Joshua Bloch 撰写的关于字段的防御性复制。

Definitely. Consider this example. I have added some basic defensive copying practice.

/**
* MyClass is an immutable class, since there is no way to change
* its state after construction.
*/

public final class MyClass{

private final String myString;

public MyClass(String myString){
   this.myString = myString;
}

 /**
  * Returns an immutable object. String is immutable.
  *
  */

public String getMyString(){
   return myString;
}

//no need to provide a setter to keep myString as immutable after initial state
}

Consider reading this post by Joshua Bloch on defensive copying of fields.

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