传递一个数组和其他东西到var args

Question

我在一个流畅的API上调用一个库方法，它需要一个字符串的变量。当我调用它时，我总是传递至少三个字符串，然后根据情况再传递几个。

可以有一个最终的静态数组或其他东西来捕获总是传递的三个字符串？

Answer 1

这里有一个想法：

static final String[] RESERVED = {"A", "B", "C"};

...

libMethod(Stream.concat(Arrays.stream(RESERVED), Stream.of("D")).toArray(String[]::new));

Answer 2

也许是这样的：

public class Overloaded {

  private static final String[] CONST_ARR = {"1", "2", "3"};

  public static void main(String[] args) {
    Overloaded o = new Overloaded();

    o.withConstantStrings();

    String[] a = {"1", "2"};

    o.withAdditionalStrings(a);
  }

  public void withConstantStrings() {
    libraryVarArgsCode(CONST_ARR);
  }

  public void withAdditionalStrings(String... additional) {
    String[] join = new String[additional.length + CONST_ARR.length];

    System.arraycopy(CONST_ARR, 0, join, 0, CONST_ARR.length);
    System.arraycopy(additional, 0, join, CONST_ARR.length, additional.length);

    libraryVarArgsCode(join);
  }

  public void libraryVarArgsCode(String... args) {
    // librabry code here
  }
}