public class StrParamTest {

 public static void main(String[] args) {

 String[] strings = new String[]{"1","2"};

 StrParamTest.sayHi(strings);

 StrParamTest.sayHi("A");

 StrParamTest.sayHi("O", "P");

 StrParamTest.sayHi();

 StrParamTest.sayHi(null);

 }

 private static void sayHi( String... strings ){

 System.out.println("----------" + strings);

 if ( strings != null ) {

 for (String string : strings) {

 System.out.println(string);

 }

 }

 else {

 System.out.println("=========null");

 }

 }

 }