Nick Zapo

is it possible to replicate only the backend in vertical approach (with micro frontend) or is it more like a block (frontend/backend tightly coupled)?

There is no particular reason that I didnt use an array initialiser.
In the for loop the updateStatement is executed after the loop execution (body). And if I don't mess around with the i variable, from the initialization block, inside the body - everything will be fine. In while and do while, in this example, I increase the value of variables inside the body. So I need to pay attention at what point I increment the variables i and j. Another thing is a scope of i and j, I initialized both with the value 0 but after execution of the loops the value is not 0 anymore.If I move the ++ to the line 47 I will increase j after the condition check and provoke out of bound exception.
Yes I read about the Object.clone(), it creates and returns a shalllow copy of the object. So in this case the copy of the array middleNames. But I'm stil not sure why I would use it in the getMiddleNames method. Why not just return this.middleNames.

ok, sorry. So here is the final version

import java.util.Arrays; import java.util.stream.Stream; public class IterationExamples { public static void main(String ...args) { String[] testMiddleNames = new String[7]; testMiddleNames[0] = "a"; testMiddleNames[1] = "b"; testMiddleNames[2] = "c"; testMiddleNames[3] = "d"; testMiddleNames[4] = "e"; testMiddleNames[5] = "f"; testMiddleNames[6] = null; /** * Imperative iteration over array * imperative programming (how to do and what to do) **/ System.out.println("---iteration for---"); for(int i=0; i < testMiddleNames.length; i++) { System.out.println(testMiddleNames[i]); } System.out.println("---iteration foreach---"); for (String middleName : testMiddleNames) { System.out.println(middleName); } System.out.println("---iteration while---"); int i = 0; while (i < testMiddleNames.length) { System.out.println(testMiddleNames[i]); i++; } System.out.println("NOT SAFE---iteration do while---index out of bound exception if new String[0]"); int j = 0; do { System.out.println(testMiddleNames[j]); j++; } while (j < testMiddleNames.length); /** * Declarative iteration over array * declarative programming (what to do) * Stream API is used to process collections of objects. A stream is a sequence of objects * that supports various methods which can be pipelined to produce the desired result. * System.out::println is a method reference to println() * **/ System.out.println("---iteration stream of---"); Stream.of(testMiddleNames).forEach(System.out::println); System.out.println("---iteration arrays stream---"); Arrays.stream(testMiddleNames).forEach(System.out::println); } }

hi, those are my solutions how to iterate trough array.

String[] testMiddleNames = new String[7]; testMiddleNames[0] = "a"; testMiddleNames[1] = "b"; testMiddleNames[2] = "c"; testMiddleNames[3] = "d"; testMiddleNames[4] = "e"; testMiddleNames[5] = "f"; testMiddleNames[6] = "g"; System.out.println("---iteration foreach---"); for (String middleName : testMiddleNames) { System.out.println(middleName); } System.out.println("---iteration for---"); for(int i=0; testMiddleNames.length > i; i++) { System.out.println(testMiddleNames[i]); } System.out.println("---iteration while---"); int i = 0; while (testMiddleNames.length > i) { System.out.println(testMiddleNames[i]); i++; System.out.println("---iteration arrays stream ---"); Arrays.stream(testMiddleNames).forEach(System.out::println); System.out.println("---iteration stream of---"); Stream.of(testMiddleNames).forEach(System.out::println); System.out.println("Not safe---iteration do while--- index out of bound if new String[0]"); int j = 0; do { System.out.println(testMiddleNames[j]); j++; } while (testMiddleNames.length > j);

String[] str = new String[0] is a valid array with size 0. You can get index out of bound exception if you try to set or get a value from this array ex. a[0] = "abc".
.clone() need to read/learn about this one, advantages disadvantages and how to use it properly.

Hey Tim,
yes i tried this one:
String ducks[3] = { "Huey", "Dewey", "Louie" };
Exception in thread "main" java.lang.Error: Unresolved compilation problem:
Syntax error on token "3", delete this token

Hi Campbell Ritchie, I'm new here and just started to prepare for OCA. I would like to try to answer questions, please correct me if im wrong. 1: not possible to declare the length and initialize array at the same time. 3: you will get out of bound exception - array is initialized but is empty  (no elemment on position 0). 4: iterate with  help of "foreach" or for. But why are you using .clone() in the getMiddleNames()?