How can I know the length of an array in the class?

Question

hard to express, I show guys an example:)
public class code{
pblic String[] str; // String array
public test () {
// I hope to print all items in the array after initiation;
// e.g. if String[3] , then print str0, str1,str2; if String[4], then //print str0, str1, str2, str3;
My puzzle here is, since the "str" may be not the same length in different initiation of code object, how can I implement the test method to print all items

Answer 1

for (int i = 0; i < str.length; i++)
  System.out.println(str);