Anyone could explain this script to me?

[Renato Bello]

public class Mix4 {
	int counter = 0;
	public static void main(String [] args) {
		int count = 0;
		Mix4 [] m4a = new Mix4[20];
		int x = 0;

		while (x < 9) {

			m4a[x] = new Mix4();
			m4a[x].counter = m4a[x].counter + 1;
			count = count + 1;
			count = count + m4a[x].maybeNew(x);
			x = x + 1;
		}
		System.out.println(count + " " + m4a[1].counter)
	}

	public int maybeNew (int index) {

		if (index < 5) {

			Mix4 m4 = new Mix4();
			m4.counter = m4counter + 1;
			return 1;
		}
		return 0;
	}
}

I don't understand particularly the relation between the two methods (line 13 and the method "maybeNew"). How to calculate it?

If is possible, explain all this script.

Thanks

[Gaurangkumar Khalasi]

public class Mix4 {
	int counter = 0;
	public static void main(String [] args) {
		int count = 0;
		Mix4 [] m4a = new Mix4[20]; //Creating an array which will contain 20 objects of Mix4
		int x = 0;

		while (x < 9) {

			m4a[x] = new Mix4();    // Creating an Object of Mix4
			m4a[x].counter = m4a[x].counter + 1;
			count = count + 1;
			count = count + m4a[x].maybeNew(x); //With the help of instance of Mix4 i.e.
			          // m4a[x], we are calling instance method 'maybeNew', which return int.
			x = x + 1;
		}
		System.out.println(count + " " + m4a[1].counter)
	}

	public int maybeNew (int index) {       // Method will return 1 if index>5 otherwise 0

		if (index < 5) {

			Mix4 m4 = new Mix4();             // It is useless here
			m4.counter = m4counter + 1;  // It is useless here
			return 1;
		}
		return 0;
	}
}

[Renato Bello]

Thank you, GK

I still have some questions:

21 if (index < 5) {

- then the index will always be less than 5 because there is nothing that increments this value?

23 Mix4 m4 = new Mix4();
24 m4.counter = m4counter + 1;

- the total value of m4.counter is infinite and has no use for anything, right?

25 return 1;

- I use the return value of the method maybeNew using the parameter value "index" to add to the value of the variable "count"?

13 count = count + m4a[x].maybeNew(x);

- I still do not understand what is the relationship between M4a [x] and the method "maybeNew". (are in different methods and thought that would relate instance variables with class objects)

[Henry Wong]

Please QuoteYourSources.

[Renato Bello]

Henry Wong wrote:Please QuoteYourSources.

Sorry, I thought that the questions was related to the script, I didn't need to identify the parts. Have fix it.

[Henry Wong]

Renato Bello wrote:

Henry Wong wrote:Please QuoteYourSources.

Sorry, I thought that the questions was related to the script, I didn't need to identify the parts. Have fix it.

Please click on the link -- and read why we require this. This is not optional.... and BTW, it looks like you quoted the sources for your previous topics, why won't you quote it for this one?

Henry

[Renato Bello]

Renato Bello wrote:Thank you, GK

I still have some questions:

21 if (index < 5) {

- then the index will always be less than 5 because there is nothing that increments this value?

23 Mix4 m4 = new Mix4();
24 m4.counter = m4counter + 1;

- the total value of m4.counter is infinite and has no use for anything, right?

25 return 1;

- I use the return value of the method maybeNew using the parameter value "index" to add to the value of the variable "count"?

13 count = count + m4a[x].maybeNew(x);

- I still do not understand what is the relationship between M4a [x] and the method "maybeNew". (are in different methods and thought that would relate instance variables with class objects)

I am still here with the hope that someone help me with these dilemmas.

[Winston Gutkowski]

Renato Bello wrote:I am still here with the hope that someone help me with these dilemmas.

And we're still hoping you'll comply with Henry's request. As he said, this is not optional.

Winston

[Winston Gutkowski]

@Gaurangkumar:

1. Please don't provide ready-made solutions. We are NotACodeMill (←click).
2. Please don't put enormously long lines inside code boxes. It screws up the windowing. I've broken up yours, but please read the UseCodeTags page thoroughly for future reference.

Thanks

Winston

[Renato Bello]

Winston Gutkowski wrote:

Renato Bello wrote:I am still here with the hope that someone help me with these dilemmas.

And we're still hoping you'll comply with Henry's request. As he said, this is not optional.

Winston

I just do not include the reference source because I could not edit the first post. If you can cite the source now, I tell the script that is quoted in the book Head First Java. I apologize again for the fault

[Henry Wong]

Renato Bello wrote:

21 if (index < 5) {

- then the index will always be less than 5 because there is nothing that increments this value?

No. The index is actually passed in as a parameter -- and it does look like the index is incremented by the calling loop.

Renato Bello wrote:

23 Mix4 m4 = new Mix4();
24 m4.counter = m4counter + 1;

- the total value of m4.counter is infinite and has no use for anything, right?

The code creates a new object, whose counter is zero. It gets incremented to one. And then the object is thrown away. Those two lines of code doesn't do anything useful.

Renato Bello wrote:

25 return 1;

- I use the return value of the method maybeNew using the parameter value "index" to add to the value of the variable "count"?

Well, that is what the expression looks like ... see next question.

Renato Bello wrote:

13 count = count + m4a[x].maybeNew(x);

- I still do not understand what is the relationship between M4a [x] and the method "maybeNew". (are in different methods and thought that would relate instance variables with class objects)

m4a[x].maybeNew(x) is part of an expression. It basically says, take the m4a array; deference it to the x element; use that element to call the maybeNew() method, passing the x value as the parameter.

Henry

[Winston Gutkowski]

Renato Bello wrote:I just do not include the reference source because I could not edit the first post. If you can cite the source now, I tell the script that is quoted in the book Head First Java. I apologize again for the fault

No probs. And BTW, you cited it in your last post: citation is simply stating the source of something.

You'll notice that Henry has now replied to your previous one.

Winston

[Renato Bello]

Thank you, guys

Have some things that I still can not understand, but I'll keep pushing myself, reading the book and posting questions here. Does anyone know if there is a free online course of java?

[Jesper de Jong]

Renato Bello wrote:Does anyone know if there is a free online course of java?

The Oracle Java Tutorials are quite good.