A function for writing variable long parameters in Java __java

More and more Java libraries are using variable-length parameters that are no longer necessary to add a new object[.

So how do you implement one of these variable-length functions yourself?

Let's do this by adding a long string of integers as an example:

variable length parameter is used t ... It is indicated that in the function body, it is actually an array of type T, and then the variable length parameters like an array of operations are done.

Example:

public class Kmath {public
    static int add (int ... args) {int result
        = 0;
        for (int arg:args) {result
            = arg;
        }
        return result;
    }

It should be noted that this t ... You must put it on the last side of the argument list to avoid ambiguity.

Test code:

public class Variablearglengthlisttest {
    @Test public
    void Test_variable_length_arg_list_works () {
        Assertthat (Kmath.add (1, 2, 3, 4), is ());
        Assertthat (Kmath.add (1, 2, 3), is (6));
        Assertthat (Kmath.add (1, 2), is (3));
        Assertthat (Kmath.add (1), is (1));
    }

Done.