java - 我应该如何声明可变参数参数

Question

public void foo(Integer... ids) {
    Integer... fIds = bar(ids);
}

public void bar(Integer... ids) {
// I would like to eliminate few ids and return a subset. How should I declare the return argument 
}

我应该如何声明 bar 的返回类型？

Answer 1

您可以将 vararg 参数作为数组引用。

public Integer[] bar(Integer... ids) {
..
}

参见varargs docs

It is still true that multiple arguments must be passed in an array, but the varargs feature automates and hides the process

对于jvm来说这实际上是一个数组，编译器隐藏了数组的创建。