Doc extends PlainDocument problem

prithaa

Hello I am using the following code to use createLeafElement from PlainDocument public class Doc extends PlainDocument { private static final long serialVersionUID = 1L; protected Element createLeafElement(Element parent, AttributeSet a, int p0, int p1) { return createLeafElement(parent, a, p0, p1); } } The above class without the createLeafElement() method works fine .But if I add this method I get runtime error saying program not responding. My purpose is to use createLeafElement() method.How can I use it? Thanks Prithaa

Nagy Vilmos

0. Wrap code in <pre> tags please. 1. What is the exact exception? Try using copy/paste. 2. The method wont work try calling the super implementation:

public class Doc extends PlainDocument {

private static final long serialVersionUID = 1L;	

protected Element createLeafElement(Element parent, AttributeSet a, int p0, int p1) {
    return super.createLeafElement(parent, a, p0, p1);
}

}

3. Finally, why override if you are not changing anything?

Panic, Chaos, Destruction. My work here is done. Drink. Get drunk. Fall over - P O'H OK, I will win to day or my name isn't Ethel Crudacre! - DD Ethel Crudacre I cannot live by bread alone. Bacon and ketchup are needed as well. - Trollslayer Have a bit more patience with newbies. Of course some of them act dumb - they're often *students*, for heaven's sake - Terry Pratchett

prithaa

thanks for your advice I dont want to override but the method createLeafElemenmt() and createdefaultroot() are not visible when I want to use them directly. With the following object D1 the methods are not visible. PlainDocument D1 = new PlainDocument(); Thanks for your time

Nagy Vilmos

The example I gave should work as it calls the protected method on the super class.

Panic, Chaos, Destruction. My work here is done. Drink. Get drunk. Fall over - P O'H OK, I will win to day or my name isn't Ethel Crudacre! - DD Ethel Crudacre I cannot live by bread alone. Bacon and ketchup are needed as well. - Trollslayer Have a bit more patience with newbies. Of course some of them act dumb - they're often *students*, for heaven's sake - Terry Pratchett

prithaa

yes it does do the needful but why are the methods not visible in the subclasses protected methods should be visible in subclasses,is it not? thanks prithaa

Nagy Vilmos

Read this[^] to understand access modifiers. If something is protected it is visible within the package and to any sub-classes. By being visible to the sub-classes, it can be called from the class, but not from classes referencing the class.

Panic, Chaos, Destruction. My work here is done. Drink. Get drunk. Fall over - P O'H OK, I will win to day or my name isn't Ethel Crudacre! - DD Ethel Crudacre I cannot live by bread alone. Bacon and ketchup are needed as well. - Trollslayer Have a bit more patience with newbies. Of course some of them act dumb - they're often *students*, for heaven's sake - Terry Pratchett

prithaa

thanks

User 11808067

My problem is that,when i enter a numeric value starting with 0 for ex: 0123 then at the time of saving,
it automatically converts this numeric value into something else like 83 or 9 etc.

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