关于可变长度参数列表(Variable Length Argument List)调用结果的疑问

Hey there! Let's clear up this confusion step by step—you're closer than you think, just mixed up one key detail.

First, let's demystify the variable-length parameter list (int ... a) in your method:

• This syntax is just shorthand for an int[] array. When you call get(1, 2, 3, 4, 5, 6, 7), all those arguments get automatically packed into an array that looks like this:

  int[] a = {1, 2, 3, 4, 5, 6, 7};
  

Next, the critical part you might have missed: array indices start at 0, not 1. Let's map the indices to your values:

• a[0] = 1 (first argument)
• a[1] = 2 (second argument)
• a[2] = 3 (third argument)

Your method returns a[2], so the result of get(1, 2, 3, 4, 5, 6, 7) is 3, not the 2 you initially thought.

It's super easy to mix up "position in the argument list" with "array index"—just remember that almost all programming languages use 0-based indexing for arrays, and varargs are just arrays under the hood!

内容的提问来源于stack exchange，提问作者Taylor