arrays print help?

[orry kaplan]

hi, i am trying to print these arrays however it is coming up with an error on one part (listed below)

Data x = new Data("Fred",21);
		x.Print();
		Data p = new Data("Jo",43);
		p.Print();
		Data o = new Data("Zoe",37);
		o.Print();

for(int i = 0; i < list.size(); i++) {
			System.out.println(list.get(i).GetName()+" "+list.get(i).GetAge());

ArrayList<Data> ArrayA = new ArrayList<Data>();
			list.add(x);
		    list.add(p);
			list.add(o);
			
			ArrayList<Data> ArrayB = new ArrayList<>();
			
			PrintDataArray(ArrayA);   (ERROR ON PrintDataArray) for all 3 rows
			System.out.println();
			ArrayB = ArrayA;
			PrintDataArray(ArrayB);
			System.out.println();
			ArrayA.remove(1);
			PrintDataArray(ArrayB);

I am sooo confused as to why this is showing, any help?

[Carey Brown]

2 things would help us help you: 1) show all of your code, 2) copy-n-paste error message(s) into your post.

PrintDataArray(ArrayA);

Do you have such a method? What argument is the method expecting?

[orry kaplan]

Carey Brown wrote:2 things would help us help you: 1) show all of your code, 2) copy-n-paste error message(s) into your post.

PrintDataArray(ArrayA);

Do you have such a method? What argument is the method expecting?

This is all of the code i have. And my error message i got is, " The method PrintDataArray(ArrayList<Data>) is undefined for the type PJ1"

[Carey Brown]

orry kaplan wrote:

Carey Brown wrote:2 things would help us help you: 1) show all of your code, 2) copy-n-paste error message(s) into your post.

PrintDataArray(ArrayA);

Do you have such a method? What argument is the method expecting?

This is all of the code i have. And my error message i got is, " The method PrintDataArray(ArrayList<Data>) is undefined for the type PJ1"

It's telling you you haven't defined this method so you'll need to define it.

[Carey Brown]

orry kaplan wrote:This is all of the code i have. And my error message i got is, " The method PrintDataArray(ArrayList<Data>) is undefined for the type PJ1"

What is PJ1 ?

[orry kaplan]

Carey Brown wrote:

orry kaplan wrote:This is all of the code i have. And my error message i got is, " The method PrintDataArray(ArrayList<Data>) is undefined for the type PJ1"

What is PJ1 ?

Thats just the name of the project. Do you know what the problem is and how i can possibly fix it?

[Carey Brown]

Carey Brown wrote:2 things would help us help you: 1) show all of your code, 2) copy-n-paste error message(s) into your post.

[Vibhor Rawat]

orry kaplan wrote:

Carey Brown wrote:2 things would help us help you: 1) show all of your code, 2) copy-n-paste error message(s) into your post.

" The method PrintDataArray(ArrayList<Data>) is undefined for the type PJ1"

Above statement itself is the problem definition. You need to define PrintDataArray() in your class. Besides, it would be very helpful if you share whole code here.

[Dave Tolls]

orry kaplan wrote:[
This is all of the code i have.

How can this be all the code?
There isn't even a class definition.

[orry kaplan]

Dave Tolls wrote:

orry kaplan wrote:[
This is all of the code i have.

How can this be all the code?
There isn't even a class definition.

import java.util.Arrays;


public class Lab {
	public static void main(String args[])
	{		
		Data x = new Data("Fred",21);
		x.Print();
		Data p = new Data("Jo",43);
		p.Print();
		Data o = new Data("Zoe",37);
		o.Print();
		System.out.println("");
		
		ArrayList<Data> list = new ArrayList<Data>();
		list.add(x);
	        list.add(p);
	 	list.add(o);
		
		for(int i = 0; i < list.size(); i++) {
			System.out.println(list.get(i).GetName()+" "+list.get(i).GetAge());
			System.out.println("");

			
			//Part 2


public void method(String[] PrintDataArray) {
			System.out.println(Arrays.toString((PrintDataArray)));
			   }
			 ArrayList ArrayA = new ArrayList();
			 ArrayA.method(new String[]{});
			
			ArrayList<Data> ArrayA = new ArrayList<Data>();
			list.add(x);
		    list.add(p);
			list.add(o);
			
			ArrayList<Data> ArrayB = new ArrayList<>();
			
			PrintDataArray(ArrayA);
			System.out.println();
			ArrayB = ArrayA;
			PrintDataArray(ArrayB);
			System.out.println();
			ArrayA.remove(1);
			PrintDataArray(ArrayB);




			
			
			
	}
  }
}

[Carey Brown]

For starters

public void method(String[] PrintDataArray) {

Here you are defining a method whose name is "method", not PrintDataArray.
You are expecting a parameter of type String[] instead of an ArrayList<Data>.
Your parameter name is PrintDataArray, which is ok unto itself, but should ideally be a different name than the name of the method.

[Carey Brown]

Secondly you're attempting to define PrintDataArray inside the main() method. Java doesn't accept nested methods. You can have nested calls, but not nested definitions.

Edit: Define it after main()'s '}' and before the class' '}'.

Nit:
The Java convention is for method names to start  with a lower case letter.

[Knute Snortum]

Dave Tolls wrote:

orry kaplan wrote:[
This is all of the code i have.

How can this be all the code?
There isn't even a class definition.

The code you posted doesn't compile. (Carry points out one reason why).  Please post the entire code, exactly as you have written it, that compiles and runs, or produces an error.  If the latter, please post the entire error message.