问题描述
据我所知，array 由固定数量的元素组成，而 可变长度参数 接受与您传递的参数(相同类型)一样多的参数.但它们是一样的吗?我可以在另一个预期的地方通过一个吗?
As I understand an array consists of fixed number of elements and a variable length argument takes as many number of arguments as you pass (of the same type). But are they same? Can I pass one where the other is expected?
推荐答案
是的，如果您有一个带有 varargs 参数的方法，如下所示:
Yes, if you have a method with a varargs parameter like this:
public void foo(String... names)
你这样称呼它:
foo("x", "y", "z");
然后编译器将其转换为:
then the compiler just converts that into:
foo(new String[] { "x", "y", "z"});
names 参数的类型是 String[]，可以像任何其他数组变量一样使用.注意它可能仍然是null:
The type of the names parameter is String[], and can be used just like any other array variable. Note that it could still be null:
String[] nullNames = null;
foo(nullNames);
请参阅有关可变参数的文档更多信息.
这不是意味着可变参数可以与数组互换 - 您仍然需要声明接受可变参数的方法.例如，如果您的方法声明为:
This does not mean that varargs are interchangeable with arrays - you still need to declare the method to accept varargs. For example, if your method were declared as:
public void foo(String[] names)
那么第一种调用方式将无法编译.
then the first way of calling it would not compile.
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