Java中的本地范围 [英] local scope in Java

问题描述

为什么花括号没有在Java中定义单独的本地作用域?我期望这是主要花括号语言(C，C ++，Java，C#)所共有的功能.

Why is it that curly braces do not define a separate local scope in Java? I was expecting this to be a feature common to the main curly brace languages (C, C++, Java, C#).

class LocalScopeTester
{
    public static void main(String... args)
    {
        Dog mine = new Dog("fido");
        if (mine.getName().equals("ace"))
        {
            Dog mine = new Dog("spot"); // error: duplicate local
        }
        else
        {
            Dog mine = new Dog("barkley"); // error: duplicate local
            {
                Dog mine = new Dog("boy"); // error: duplicate local
            }
        }
    }
}

推荐答案

它们确实定义了单独的局部作用域，但是您仍然不能从父作用域中屏蔽局部变量(但是您当然可以屏蔽实例变量).

They do define a separate local scope, but you still cannot mask local variables from a parent scope (but you can of course mask instance variables).

但是您可以定义新变量(使用不同的名称)，并且它们的范围将限于括号内.

But you can define new variables (with different names) and their scope will be limited to within the braces.

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