Passing an array and something else to var args

Question

I am calling a library method on a fluent API that takes a var args of Strings. when I call it I always pass at least three strings and then a few more depending on circumstance.

Can have a final static array or something to capture the three Strings that are always passed?

Just wrap this method into your own that always pass these 3 values in addition to the other ones, received as argument. — JB Nizet
– JB Nizet, Commented Aug 10, 2019 at 22:14

JB Nizet · Accepted Answer · 2019-08-10 22:41:43Z

3

Perhaps something like this:

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
  }
}

edited Aug 10, 2019 at 22:41

JB Nizet

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answered Aug 10, 2019 at 22:35

Benjamin Slabbert

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Comments

Oleksandr Pyrohov · Accepted Answer · 2019-08-10 23:55:45Z

2

Here is an idea:

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

...

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

edited Aug 10, 2019 at 23:55

answered Aug 10, 2019 at 22:44

Oleksandr Pyrohov

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