java - C# 风格的对象初始化器在 Java 中是否可用

Question

喜欢这个？ 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"
    }
};

Answer 1

其实有!

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。但是我会避免这个成语，因为它有一些意想不到的副作用，例如这种语法实际上创建了一个匿名内部类 Person$1 和 Address$。

另见

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