可以在Java中使用C#样式对象初始化吗? [英] Can C# style object initialization be used in Java?

问题描述

在C#中，可以编写:

MyClass obj = new MyClass()
{
    field1 = "hello",
    field2 = "world",
    field3 = new MyOtherClass()
    {
        etc....
    }
}

我可以看到可以以类似的方式完成数组初始化，但也可以在Java中完成与上面类似的操作，如果可以，语法是什么?

I can see that array initialization can be done in a similar way but can something similar to the above be done in Java too, and if so, what's the syntax?

推荐答案

Java中不存在初始化语法 .

That initialization syntax is not present in Java.

一种类似的方法是使用双括号初始化，在其中创建带有初始化程序块的匿名内部子类:

A similar approach is to use double brace initialization, where you create an anonymous inner sub class with an initializer block:

MyClass obj = new MyClass() {{
  // in Java these would be more like this: setFieldX(value);
  field1 = "hello";
  field2 = "world";
  field3 = new MyOtherClass() ...
}};

请注意，您实际上是在创建子类.

Be aware though, that you're actually creating a subclass.

另一种方法是为 MyClass 创建一个构建器，并使用如下代码:

Another approach is to create a builder for MyClass, and have code like this:

MyClass obj = new MyClassBuilder().
  withField1("hello").
  withField2("world").
  withField3(new MyOtherClass()).
  build();

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