创建不可变的Java对象 [英] Make immutable Java object

问题描述

我的目标是使Java对象不可变。我有一个班级学生。我用以下方式对其进行编码以实现不变性：

My goal is to make a Java object immutable. I have a class Student. I coded it in the following way to achieve immutability:

public final class Student {

private String name;
private String age;

public Student(String name, String age) {
    this.name = name;
    this.age = age;
}

public String getName() {
    return name;
}

public String getAge() {
    return age;
}

}

我的问题是，什么是实现学生课程的不变性的最佳方法？

My question is, what is the best way to achieve immutability for the Student class?

推荐答案

严格来说，你的类不是一成不变的，它只是有效的一成不变的。要使其不可变，您需要使用 final ：

Your class is not immutable strictly speaking, it is only effectively immutable. To make it immutable, you need to use final:

private final String name;
private final String age;

虽然差异可能看似微妙，但它可以在多线程上下文中产生重大影响。不可变类本质上是线程安全的，只有在安全发布时，有效不可变类才是线程安全的。

Although the difference might seem subtle, it can make a significant difference in a multi-threaded context. An immutable class is inherently thread-safe, an effectively immutable class is thread safe only if it is safely published.

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