为什么不是Java通INT []以可变参数？ [英] Why won't Java pass int[] to vararg?

问题描述

为什么不这样编译？

public class PrimitiveVarArgs
{
    public static void main(String[] args)
    {
        int[] ints = new int[]{1, 2, 3, 4, 5};
        prints(ints);
    }

    void prints(int... ints)
    {
        for(int i : ints)
            System.out.println(i);
    }
}

据抱怨线5条，他说：

It complains about line 5, saying:

method prints in class PrimitiveVarArgs cannot be applied to given types;
  required: int[]
  found: int[]
  reason: varargs mismatch; int[] cannot be converted to int

但据我（等人对SO ）知道， INT ... 相同 INT [] 。这工作，如果它是一个非基本类型，如字符串，但不能在原语。

but as far as I (and others on SO) know, int... is the same as int[]. This works if it's a non-primitive type, like String, but not on primitives.

我甚至无法添加此方法：

I can't even add this method:

void prints(int[] ints)
{
    for(int i : ints)
        System.out.println(i);
}

因为编译器说：

name clash: prints(int[]) and prints(int...) have the same erasure

cannot declare both prints(int[]) and prints(int...) in PrimitiveVarArgs

所以，为什么不是Java让你通过本地阵列一个可变参数的方法？同时，如果请你，给我一个方法来解决这个问题（即提供了一种方法来传递可变参数或数组此方法）。

so, why doesn't Java let you pass a native array to a varargs method? Also, if you would please, offer me a way to solve this issue (i.e. provide a way to pass variable arguments or an array to this method).

推荐答案

在您的code修正这个，它会工作：

Fix this in your code and it'll work:

static void prints(int... ints) // notice the static keyword at the beginning!

问题是不是与可变参数，它与你打电话从静态上下文的实例方法的方式。此外，还要额外确保没有其他方法相互矛盾的签名，例如这两种方法会看起来是一样的编译器：

The problem is not with the varargs, it's with the way you're calling an instance method from a static context. Also, make extra-sure that there are no other methods with conflicting signatures, for example these two methods will look the same to the compiler:

void prints(int... ints)
void prints(int[]  ints)

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