# Help for creating own library (add java file to sketch)
**URL:** https://discourse.processing.org/t/help-for-creating-own-library-add-java-file-to-sketch/7130
**Category:** Libraries
**Created:** [January 3, 2019, 8:41am UTC](https://discourse.processing.org/t/help-for-creating-own-library-add-java-file-to-sketch/7130 "2019-01-03T08:41:47Z")
**Posts on this page:** 7
**Page:** 1
### Author:  [@Wolfgang](https://discourse.processing.org/u/Wolfgang)
#### Post date: [January 3, 2019, 8:41am UTC](https://discourse.processing.org/t/help-for-creating-own-library-add-java-file-to-sketch/7130/1 "2019-01-03T08:41:47Z")
Hi erveryone,
i created a class called Adressbook. I copy the class inside the sketchbook.
created a new file and entered import Adressbook;
– no library found for Addressbook — I got as error.
What do I have to do to fix this problem? Or to you have an example (step by step) how to create a own library?
Thanks
---
### Author:  [@quark](https://discourse.processing.org/u/quark)
#### Post date: [January 3, 2019, 9:11am UTC](https://discourse.processing.org/t/help-for-creating-own-library-add-java-file-to-sketch/7130/2 "2019-01-03T09:11:37Z")
> [@Wolfgang](#):
>
> i created a class called Adressbook. I copy the class inside the sketchbook.
I assume you mean `Addressbook` and that the file you created contains Java source code, not a compiled class
1. Name the file you created as `Addressbook.java`, must be the same name including capital letters as the class name.
2. The sketch name must NOT be the same as the class
3. The `Addressbook.java` file must be in the same folder as the sketch pde file.
> [@Wolfgang](#):
>
> and entered import Adressbook;
1. Do not add the import statement because it is not needed
> [@Wolfgang](#):
>
> no library found for Addressbook — I got as error.
1. Theis error was created because of the import statement.
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### Author:  [@GoToLoop](https://discourse.processing.org/u/GoToLoop)
#### Post date: [January 3, 2019, 2:06pm UTC](https://discourse.processing.org/t/help-for-creating-own-library-add-java-file-to-sketch/7130/3 "2019-01-03T14:06:38Z")
> [@Including shared pde files across projects](https://discourse.processing.org/t/including-shared-pde-files-across-projects/1701):
>
> Honey gave me an answer to my question [How can I make an include file for my scripts - SOLVED THANKS](https://discourse.processing.org/t/how-can-i-make-an-include-file-for-my-scripts-solved-thanks/1569) which to paraphrase said stick your variables in a file called file.pde in the same directory and it is included automagically. And that works nicely BUT I want to share my variables between projects, so I thought I could just move the file up a level to the projects directory and that might work, but no I get a message variable cannot be resolved. So I hunted about looking for an answer and…
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### Author:  [@Wolfgang](https://discourse.processing.org/u/Wolfgang)
#### Post date: [January 3, 2019, 7:51pm UTC](https://discourse.processing.org/t/help-for-creating-own-library-add-java-file-to-sketch/7130/4 "2019-01-03T19:51:34Z")
Thanks for you answer but it did not work for me.
File name is called Addressbook store in sketch folder.
Class Name Addressbook
When I save Addressbook.pde as Addressbook.java An error like this:
The sketch name had to be modified. Sketch names can only consist of ASCII characters and numbers (but cannot start with a number). They should also be less than 64 characters long.
And the new filename named Addressbook\_java gets created.
here is mine class:
```auto
class Addressbook{
private int id;
private String name;
public Addressbook(
int id,
String name) {
this.name = name;
this.id = id;
}
public String toString() {
return id + " { " + name;
}
public String getName() {
return name;
}
public int getID() {
return id;
}
}
class Adressbook {
private String name;
private Addressbook[] contacts;
public Adressbook(String name) {
this.name = name;
this.contacts = new Addressbook[0];
}
public String showAll() {
String output = "Adressbuch { " +name +"\n";
for (int i = 0; i < contacts.length; i++) {
output = output + contacts[i].toString() + "\n";
}
return output;
}
public String showByName(String name) {
for (int i = 0; i < contacts.length; i++) {
if (contacts[i].getName() == name) {
return contacts[i].toString();
}
}
return "";
}
public void addContact(Addressbook contact) {
Addressbook[] contactsNew = new Addressbook[contacts.length + 1];
for (int i = 0; i < contacts.length; i++) {
contactsNew[i] = contacts[i];
}
contactsNew[contactsNew.length -1] = contact;
contacts = contactsNew;
}
public Addressbook getContact(int id) {
for (int i = 0; i < contacts.length; i++) {
if (contacts[i].getID() == id) {
return contacts[i];
}
}
return null;
}
public void removeContact(int id) {
Addressbook[] contactsCopy = new Addressbook[0];
for (int i = 0; i < contacts.length; i++) {
if (contacts[i].getID() != id) {
Addressbook[] contactsCopyNew = new Addressbook[contactsCopy.length +1];
for (int j = 0; j < contactsCopy.length; j ++) {
contactsCopyNew[j] = contactsCopy[j];
}
contactsCopyNew[contactsCopyNew.length -1] = contacts[i];
contactsCopy = contactsCopyNew;
}
}
this.contacts = contactsCopy;
}
}
and the new sketch
import Addressbook;
public void setup() {
Adressbook privat = new Adressbook("Privat");
privat.addContact(new Contact(1, "ken Tern"));
privat.addContact(new Contact(2, "jlkjlldk"));
privat.addContact(new Contact(3, "lkjljlkj"));
print(privat.showAll());
}
```
I know you me using without import but this did also not work.
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### Author:  [@Wolfgang](https://discourse.processing.org/u/Wolfgang)
#### Post date: [January 3, 2019, 7:53pm UTC](https://discourse.processing.org/t/help-for-creating-own-library-add-java-file-to-sketch/7130/5 "2019-01-03T19:53:06Z")
All Contact should be Addressbook I know forgot to corrected.
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### Author:  [@quark](https://discourse.processing.org/u/quark)
#### Post date: [January 4, 2019, 10:58am UTC](https://discourse.processing.org/t/help-for-creating-own-library-add-java-file-to-sketch/7130/6 "2019-01-04T10:58:31Z")
OK the name you use to save the sketch MUST NOT BE THE SAME as any class you create inside the sketch
---
### Author:  [@jeremydouglass](https://discourse.processing.org/u/jeremydouglass)
#### Post date: [January 21, 2019, 5:46pm UTC](https://discourse.processing.org/t/help-for-creating-own-library-add-java-file-to-sketch/7130/7 "2019-01-21T17:46:03Z")
Just a note for future readers: Using a `.java` file in a sketch is also a way to include java in Processing, but it is not a library.
In Processing with the PDE, a “library” refers to a compiled jar file, which you can import with `import`. For most users these can be installed with Contributions Manager, and the jar is kept outside the sketch. Or the jar file – including ones that are not available through Contributions Manager – can be included directly in your sketch, for example in a `\code` folder.