Java中是否提供C＃样式对象初始值设定项 [英] Are C# style object initializers available in Java

问题描述

喜欢这个吗？ http://weblogs.asp.net/ dwahlin / archive / 2007/09/09 / c-3-0-features-object-initializers.aspx

Person p = new Person()
{
    FirstName = "John",
    LastName = "Doe",
    Address = new Address()
    {
        Street = "1234 St.",
        City = "Phoenix"
    }
};

推荐答案

实际上，有！

Person p = new Person()
{{
    setFirstName("John");
    setLastName("Doe");
    setAddress(new Address()
    {{
        setStreet("1234 St.");
        setCity("Phoenix");
    }});
}};

甚至：

Person p = new Person()
{{
    firstName = "John";
    lastName = "Doe";
    address = new Address()
    {{
        street = "1234 St.";
        city = "Phoenix";
    }});
}};

这称为双括号初始化。但是，我会避免这种习惯用法，因为它有一些意想不到的副作用，例如：这个语法实际上创建了一个匿名内部类 Person $ 1 和 Address $ 。

This is called double brace initialization. However I would avoid this idiom as it has some unexpected side-effects, e.g. this syntax actually creates an anonymous inner class Person$1 and Address$.

• 什么是双在Java中进行大括号初始化？


• Double Brace Initialization

• What is Double Brace initialization in Java?
• Double Brace Initialization

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