References and pointers in setters and getters. Need example
c++,oop,c++11,getter-setter,return-by-reference
The code you provide compiles with clang on mac OS X with no error. But I don't see where do you return reference or pointer, in Config you can do this: class Config { public: Config(); const string& getResourceDir() const; const JustExample& getExmp() { return exmp; } void setResourceDir(const string&...
Conflicting parameter type in implementation of NSInteger vs NSInteger*
objective-c,getter-setter,nsnumber,nsinteger
This is because NSInteger is a primitive type, not an object. It should be passed by value, not by pointer, i.e. without an asterisk: -(void)setScore:(NSInteger)score { _score = score; scoreLabel.text = [[NSNumber numberWithInteger:(long)self.score] stringValue]; } Same goes for setTopScore: method....
How to Add an Error Message when using a Virtual Attribute
ruby-on-rails,ruby,validation,getter-setter
errors is cleared whenever you run valid?, which update_attributes does. Example: irb(main):001:0> album = Album.new => #<Album id: nil, name: nil, release_date: nil, rating: nil, genre_id: nil, artist_id: nil, created_at: nil, updated_at: nil> irb(main):004:0> album.errors.add :artist, "You've selected Justin Bieber (!!!)" => ["You've selected Justin Bieber (!!!)"] irb(main):006:0> album.errors.messages =>...
How do I call a getter? [closed]
java,static-methods,getter-setter
In main method, when you're calling getData(StudentReport1, average, gpa);, the first argument you're sending is the name of the class, which doesn't make any sense at all. Instead, you need to send an instance of StudentReport1 class, which you can retrieve from the call to setData(). Update the code inside...
'does not have member' when calling objective C setter method from Swift
objective-c,swift,compiler-errors,getter-setter
In the XMPPStream class, myJID is declared as follows: @property (readwrite, copy) XMPPJID *myJID; In Objective-C, this means that there are actually two methods on the XMPPStream class that conform to the following signatures: - (XMPPJID *)myJID; - (void)setMyJID:(XMPPJID *)myJID; So, from Objective-C code, you can call them like any...
AngularJS ng-model-options getter-setter
The documentation might seem a bit fuzzy but the usage is quite simple. What you need to do: HTML: <input ng-model="pageModel.myGetterSetterFunc" ng-model-options=" {getterSetter: true }"> in JS controller, instead of the actual model, create a function that will return the value (+ apply stripping) if the there is no parameter...
(C++) setter in class won't set variable
Your immediate issue is that Location GetLocation(); returns a copy of the location, so when you call SetName here: playerStats.GetLocation().SetName("Test"); You're changing the name of the temporary copy, and the change is lost as soon as the semicolon is hit. More broadly, this kind of design (nesting classes and nesting...
Getters and Setters in Swift
swift,getter-setter,computed-properties
I understand that getter brings back String value and converts it to Double and assigns this value to variable newValue. This isn't correct. The getter just returns the double. There is no newValue in the getter. In the setter, newValue is a shortcut for "the implied argument of the...
Insert Getter / Setter at end of file with IntelliJ IDEA (Java) [duplicate]
java,intellij-idea,code-generation,getter-setter
Someone asked that before. That's not possible. See: Intellij IDEA - Generate (Alt + Insert) Old question/answer, but I couldn't find it in IDEA 14 (Community) either....
PHP getter/setter code completion in IDE
Getters and setters are a necessary evil in the world of OOP. Yes, if a class is big enough it can be a pain to read through a list of getters and setters, but with the help of a well setup enviroment and or IDE, this does not have to...
Getters are not working in JavaScript
You don't need a setter for fullName as direct assignment will work. function User(fullName) { this.fullName = fullName || ''; Object.defineProperties(this, { firstName: { get: function() { return this.fullName.split(" ")[0]; }, set: function(value) { this.firstName = value; // NOTE: This will throw an error } }, lastName: { get: function()...
Getter/Setter with same name
I believe that is Objective-C setter/getter style. For example, see this and this. There is no surprise with overloading methods as long as you know C++ overloading well. If not, then I suggest to read more about overloading. Personally, since I come from a Java background, I like having setVariable...
Difference between return $something; vs return $this->something
When you're using a name (identifier) in your program, the compiler/interpreter needs to obtain its value. To do that, it consults its internal table of name=>value pairs, called "scope". If the name is not found in the current scope, it consults another scope, if possible, until there are no more...
Declare getter/setter in inheritance class in Javascript
javascript,oop,encapsulation,getter-setter
Found this function on mdn: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Working_with_Objects#Summary Here is an example fiddle: http://jsfiddle.net/EfyCX/1/ And here is some javascript for getters and setters using Object.defineProperties Object.defineProperties(Person.prototype, { "name": { get: function() { return this._name }, set: function(name) { this.changeCount++ this._name = name } } }) ...
How to separate getters and setters from managed bean in JSF?
java,jsf,javabeans,getter-setter
Keep the data in DTO class and create object and setters getters in Bean class. and access the properties of DTO class through Bean class in xhtml. Bean class @SessionScoped @ManagedBean(name = "loginBean") public class LoginBean implements Serializable { LoginDTO loginDTO = new LoginDTO(); public String logIn() { //here the...
retrieving values from different java files in one project
java,user-interface,reference,project,getter-setter
Sorry, I didn't see your request for an example. If the GUI is in class Main which is also where your main method is, and it creates both the text field and the AddSale object, you could do something like this: public class Main() { JTextField userIDField; public static void...
Shortcut for denoting or implying getters and setters in UML class diagrams
uml,getter-setter,class-diagram,specifications
You are correct: there is no need to include the (noise of) "boilerplate" signatures of standard setters and getters in a class model. Unfortunately, UML does not define a standard notation for implying getters and setters for private attributes. So, you'd have to use your own convention. For instance, you...
Using “this” in getters/setters in C# [closed]
There's not much to it really. You can do it, and you can avoid it. I think it's quite obvious when you're in the getter/setter that you're talking about the object you're in, so I've never used it there. Also, it seems like Resharper will suggest it's redundant, and gray...
Ruby - How to set value for dynamic attribute in class [duplicate]
ruby-on-rails,ruby,getter-setter
You should call a.send "#{attr}=", 1 a.save! ...
Java getter and setter automatically? [closed]
If all you want is to avoid having to type, use auto generation feature of IDEs like some others mentioned. If you want to avoid seeing getter/setter in your classes, use a library called lombok which can generate the getters/setters behind the scene If the above options are not OK...
Is it possible to get a reference to the setter function of a “setter”?
Given your example object: var o = { set a(value) {this.b = value}, get a() {return this.b} } You can use Object.getOwnPropertyDescriptor like this: var setter = Object.getOwnPropertyDescriptor(o, "a").set; var getter = Object.getOwnPropertyDescriptor(o, "a").get; var other = {}; setter.call(other, 123); That last statement will set the value 123 on object...
Is this method a getter/setter or neither
You current method is not a getter. Because it doesn't return data from the object. And it contains a setter that you should extract as a real setData() method. You should indeed split it in 2 methods: function retrieveData() { // get data from the database return $data; } function...
Java Programming: Getter/Setter Questions
you can use setter for integer variable as your instance variable age is integer: public void setAge(String a) { try { this.age = Integer.parseInt(a); } catch(NumberFormatException e){ //.. code } } ...
How setter works inside Spring Framework?
java,spring,spring-mvc,setter,getter-setter
You're confusing fields (or instance variables) with properties. property is a term coming from the Java Beans specification. A property foo of a bean is data that can be accessed using a getter method called getFoo() (or isFoo() for a boolean) and/or set using a setter method called setFoo(). What...
How to parse Dart programs?
parsing,annotations,dart,metadata,getter-setter
You can use the analyzer package. See also Code generator for dart ....
Blocking getters while async task completes
As I said earlier, I think this design can be improved, but I appreciated the technical challenge so I gave it a shot. What you talked about sounded not too dissimilar to Entity Framework's dynamically created change tracking proxies, so I had a quick look around for frameworks which work...
PHP Getter and Setter Performance. Is performance important here?
php,performance,benchmarking,getter-setter
Thousands of calls may not be relevant in the face of fetching data from a database and sending the response back out over the wire. You talk about "thousands of calls". Your code can make one million calls to the setters/getters and only be slowed down 0.29 seconds. Do you...
Domain Object: setters and getters or just public properties?
php,validation,getter-setter,domain-object
Checking primitive types in a dynamic, weakly typed language seems like an overkill to me 99% of the time. It really doesn't matter if your $firstname is a proper string or not, it's going to be implicitly converted to one anyway when needed. However, sometimes it does make sense to...
IOS Getter Setter cannot apply to Google Map
You are making an infinite loop over here. Inside the setter, you should set the value in instance variable. You are calling setter method again from the body of setter method. So, it will create an infinite loop. This will overrun your stack and your application will crash. See below...
Refactoring INotifyPropertyChanged Setters
c#,wpf,inotifypropertychanged,getter-setter
Yes, it will. You're still going to be a little sick of writing private backing fields and repetitive parts though: private int _foo; public int Foo { get{return _foo;}, set { SetProperty("Foo", ref _foo, value); } } you can't easily escape from that. INPC works based solely on three things:...
Getters, Setters , Object Java [closed]
I assume that you have a compiler error. Your constructor accepts only three String arguments and you are trying to pass four. Try adding the following constructor (or replace the existing one): public Person( String name, String address, String cityStateZip, String phone ) { this.name = name; this.address = address;...
Javascript getters and setters - recursion issue
javascript,recursion,getter-setter
It's quite simple. In your second example, the get, calls itself. Since you reference the property me.name, JavaScript needs to get that property. When this happens, the getter is triggered. Using your second example, JavaScript calls the getter, but the getter is then told to do the exact same thing:...
i set my array now i have to get the entire array (Java)
java,arrays,for-loop,getter-setter
Assuming getFoo() returns an the array foo (which seems to be the case from your for loop statement), you can access index x of foo with: int a = getFoo()[x]; From there, you can use a as you would any other int. This is slightly inefficient though, especially if getFoo()...
get values from getter and setter methods in java for inserting into Mongodb?
Below is the code to insert into mongodb using setters and getters. Note that 1) I have used the same Encapsulation class with getters and setters. 2) I have used mongo-java-driver-2.12.2.jar as mongo java driver. 3) mongodb is running at port 27017. Code: import com.mongodb.BasicDBObject; import com.mongodb.DB; import com.mongodb.DBCollection; import...
Python overriding setter to an attribute with no setter?
python,inheritance,python-3.x,properties,getter-setter
No, you cannot use super() for anything other than class attributes; x is an instance attribute, and there is no inheritance mechanism for attributes. Instance attributes live in a single namespace; there is no 'parent instance' attribute namespace. You can still reach the attribute in the instance __dict__ object: class...
Need help using setters and getters
Why getters and setters? You are using them fairly correctly, with a few mistakes. Getters and setters are meant to provide encapsulation of your data. For example, let's say you have a "Dog" class that has a "weight" variable public class Dog { int weight; } Current, you could create...
How do I auto-generate an integer value for each time a user input a string value?
java,arrays,oop,increment,getter-setter
For a simple simulation (like a school assignment), you can use a static variable: class BankAccount { private static int nextAccountNumber = 0; static int getNewAccountNumber() { int newNumber = nextAccountNumber; nextAccountNumber++; return newNumber; } ... BankAccount() { this.accNum = getNewAccountNumber(); } } See Understanding Class Members....
Where do I put my getter function?
java,eclipse,getter-setter,repast-simphony
Not in this context. One generally uses a getter to access a field; trees is declared as a local variable in the method build. This means that every time it's called, you get a new list, and it no longer exists once you've returned from the method. If you really...
NullPointerException while using a setter on fragment
java,android,android-listfragment,getter-setter
mExercise is NULL. Initialize it with creating new object: mExercise=new ExerciseDetails(); mExercise.setName(mName); ...
JavaScript getter method for an array property
javascript,arrays,getter-setter,accessor
What you're doing in your example is not getters/setters in JavaScript, you're setting a function on an object that creates a closure over two 'private' members of that object (and you're leaking a reference for the array). You could refer to helper functions as 'getters' and 'setters' as you would...
Using getters and setters to display the color
This happens because you only set the colour in one of your constructors. So when you create an object such as cir2, using the second constructor, the colour doesn't get set. To fix this, add a line to the second constructor to set the colour. Maybe it could be like...
how to fill a composite object using java reflection?
java,class,reflection,field,getter-setter
First of all You need to pass your Object reference which value you want set in field.set(). And second: field.getClass() gives you java.lang.reflect.Field, use field.getType()to get Class you need. So, it should be like this Field field1=myPref.getClass().getDeclaredField("ProviderSearch"); Object obj=field1.getType().newInstance(); Field field2=field1.getType().getDeclaredField("ConfigURL"); field2.set(obj, "www.stackoverflow.com"); field1.set(myPref, obj); ...
Getter and setter in ViewModel for primitive properties in an INotifyPropertyChanged Model
This is one of the basic issues with MVVM, with a few different philosophies about how to solve it. Your current approach is fine, and very pure MVVM. The drawback is the amount of work required. I am not sure if I should call OnPropertyChanged again in the ViewModel. You...
Passing variables between classes
java,android,object,parameter-passing,getter-setter
In order to pass variables between Activities, use your intent, with which you start your second activity, and the putExtra method: Intent intent = new Intent(this, classB.class); String name = objArrayList.get(pos).getName; intent.putExtra("name",name); In your classB you can get this parameter via the getIntent() method: Bundle extras = getIntent().getExtras(); if(extras !=...
Array access on a Getter that returns a pointer, is that bad practice?
c++,c,arrays,pointers,getter-setter
If you really need such const expression you could make it into a function: class A { int a[50]; bool check_this_and_that() { return a[22] == SOME_RANDOM_DEFINE; }; }; ... A b; if(b.check_this_and_that()) do_this_and_that(); magic numbers are bad in general but inside a class logic it's more forgiveable and outsiders don't...
Java conventions for accessible data. (Public accessors & Getters/Naming)
java,naming-conventions,getter-setter
Getters (and setters) come from the Java Bean specification. The reasons to use them are multiple: most Java developers expect accessors to be named like that an API respecting these conventions is easier to discover. For example, in my IDE, I'll often press get CtrlSpace to discover all the information...
Access safety of getters in Java
java,getter-setter,access-modifiers
No, it isn't okay because it breaks encapsulation and thus the class can't maintain its own invariants. Same with constructors. But the problem isn't with getters/setters, it's with the code that autogenerates them. To cut a long story short: don't use autogenerated accessors blindly, if they're dealing with mutable structures,...
Setup for getter and setter in a jQuery plugin
jquery,jquery-ui,plugins,getter-setter
I've found this blog-post about the same issues, I really like how he did this. Saving the object into $elem.data() makes it easy to open the object to the outside world.
Java: using setter of a subclass when creating an object of type Superclass
java,subclass,getter-setter,superclass
Cast p1 to Man: ((Man) p1).setAge(13); ...
How to Store Canvas image to server using struts2 mvc
java,jquery,struts2,html5-canvas,getter-setter
Send request using ajax: var canvas=document.getElementById('can'); var dataURL = canvas.toDataURL("image/png"); var data = { img64:dataURL.replace(/^data:image\/(png|jpg);base64,/, ""), }; $.ajax( { type: 'POST', url: "/FMVMLAST/Canvasimage", data:data, success: function(data){} }); Edit your struts.xml file <struts> <bean type="org.apache.struts2.dispatcher.multipart.MultiPartRequest" name="jakartaStream" class="org.apache.struts2.dispatcher.multipart.JakartaMultiPartRequest" scope="default" /> <constant...
is it possible to declare a Java Class variable using getClass()?
java,reflection,instance-variables,getter-setter
Yes, it is possible to do it with reflection. You might iterate the fields and then call your method on a Logger field. Something like, public void writeText(Object parameter) { Class<?> aClass = parameter.getClass(); for (Field f : aClass.getDeclaredFields()) { if (f.getName().equals("logger")) { try { f.setAccessible(true); Logger log = (Logger)...
Parsing Date in string Database using getters/setters
java,android,listview,getter-setter
thanks to "mithrop" for his help, this's what i did to fix the problem : String tname = team_list.get(i).getTeamname(); String topponent = team_list.get(i).getTeamopponent(); String tdate111 = team_list.get(i).getTeamdate(); SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm"); sdf.setTimeZone(TimeZone.getTimeZone("GMT+9")); Date datex = null; try { datex = sdf.parse(tdate111); } catch (ParseException e) { e.printStackTrace(); }...
Possible to use magic methods __get and __set for both array and nonarray class member variables?
php,arrays,oop,getter-setter,magic-methods
Simple, define __get() like so: public function &__get($name) { return $this->$name; } // ... $fun = new example(); $fun->a = 'yay'; $fun->b['coolio'] = 'yay2'; var_dump($fun); Output: object(example)#1 (2) { ["a":protected]=> string(3) "yay" ["b":protected]=> array(1) { ["coolio"]=> string(4) "yay2" } } Do take necessary care when you're dealing with references, it's...
Mongoose.js getter that inflates subdocuments on Find()?
json,node.js,mongodb,mongoose,getter-setter
You can invoke your getter in res.send by adding the {toJSON: {getters: true}} option to the ProjectSchema definition. You'll probably want to enable that for the toObject option as well for cases like passing the doc to console.log. var ProjectSchema = new Schema({ name: { type: String, required: false, default:...
Calculating distance between two points in 3D
java,distance,getter-setter,coordinate,euclidean-distance
As @Dude pointed out in the comments, you should write a method: public double distanceTo(Point3d p) { return Math.sqrt(Math.pow(x - p.getxCoord(), 2) + Math.pow(y - p.getyCoord(), 2) + Math.pow(z - p.getzCoord(), 2)); } Then if you want to get the distance between 2 points you just call: myPoint.distanceTo(myOtherPoint); //or if...
A class attribute type of List which is not modifiable by accessor
java,getter-setter,accessor,mutators
You can make getAll() returning an unmodifiable list. You can think it like if it was returning a view, so the list will only be in read-only mode. Any calls that will try modify the list returned will throw an UnsupportedOperationException. public List<Integer> getAll(){ return Collections.unmodifiableList(all); } ...
wrong number of template arguments (3, should be 4)
c++,templates,properties,arguments,getter-setter
There are three mistakes in your code: Firstly, to get the address of a member function, you need to include the class name: RWProperty<uint, OptionSet , &OptionSet::getNumberOfVbo // ~~~~~~~~~~~^ , &OptionSet::setNumberOfVbo> uNumberOfVbo; // ~~~~~~~~~~~^ Secondly, to form a pointer to const qualified member function, you need to append const keyword...
Getter and Setter Methods in Model class [closed]
problem with your code you are creating multiple Model objects try this code public StaffInformation(){ ModelClass mc = new ModelClass(); mc.setName("Khan"); mc.setAge(30); mc.setAddress("NY"); Main.displayData(mc); } Here is your main class class Main{ public static displayData(ModelClass mc) { System.out.println(mc.getAge()); System.out.println(mc.getName()); System.out.println(mc.getAddress()); } public static void main(String[] args) { StaffInformation sc=new StaffInformation();...
Java: How do I create a getter method that gets an object from an inherited class?
java,class,inheritance,getter,getter-setter
I think what you need looks something like this: public class Catalogue { private Mammal mammal; private Bird[] birds; public Catalogue(Mammal mammal, Bird[] birds) { this.mammal = mammal; this.birds = birds; } public Mammal getMammal() { return mammal; } public Bird[] getBirds() { return birds; } } This creates a...
Javafx how to access controls of second controller from first controller
java,model-view-controller,javafx,getter-setter
When you check the check box then in the controller of the FirstView (where you implement an event handler for the check box click) change the label text in your model. Your model should be bound to your views therefore the label text in your SecondView should be updated. If...
Having problems with Get and set method in Java
A getter should not be static. I made some modifications. This should work: public class Person { private String navn; private int personNummer; private int alder; public Person (String navn, int personNummer, int alder) { this.navn = navn; this.personNummer = personNummer; this.alder = alder; } public String getName() { return...
Create multiple properties with the same getters and setters
javascript,setter,getter,getter-setter
Is it possible to define the same setters and getters on different properties of an object? Yes, although it's not recommended as you can see from your experience. what am I doing wrong, and why do my properties behave like they're the same property? Because they store/access the value...
defining getters/setters in an object literal with a self-invoking function javascript
Not really. You can also create an IIF for obj though: obj = function () { var privatething = 'hithere'; return { get value() { return privatething; }, set value(v) { privatething = v; } }; }(); obj.value; //=> 'hithere'; obj.value = 'good morning to you too'; obj.value; //=> 'good...
Is it possible to override the property setter of a super class without needing to redefine the property
python,inheritance,python-3.x,properties,getter-setter
You need to specify the class name as well: class Eggs(Spam): @Spam.foo.setter def foo(self, foo): self.bar = ' '.join(['Egg\'s foo:', foo]) ...
Chrome does not see attributes redefined with getter and setter added with Object.defineProperty
javascript,google-chrome-extension,getter-setter
I figured out that the only way to solve my problem was to use setAttribute and getAttribute. I really think it's the only way to do that! To completely reach the goal of my problem (that was to "keep an eye" on how the src property of an element was...
Overriding getter in Swift
swift,inheritance,override,getter-setter
This works for me: public class MyBaseClass { private var _name: String = "Hi" public internal(set) var name: String { get { return self._name } set { self._name = newValue } } } public class MyDerivedClass:MyBaseClass { override public var name: String { get { return "Derived - \(super.name)" }...
How to use setters and getters in a Javascript object (Class)?
javascript,class,setter,getter,getter-setter
You can use Object.defineProperties(): function AnObject() { Object.defineProperties(this, { apple: { get: function() { return this._apple + " GET"; }, set: function(value) { this._apple = value; }, configurable: true, writable: true } }); } Note that you have to be careful to use a different property name if you want...
How to send content of a variable from one form to another form using java
java,forms,global-variables,getter-setter
The problem is that both DrawForm and AttributeForm both have their own "main" method, so they are running as 2 completely separate applications. Since they are 2 separate applications, they cannot access each others variables. I think you need to remove the "main" methods from both Form classes, and create...
Why doesn't setter get called when using property() function? [duplicate]
python,getter-setter,python-2.x,accessor
Properties need to be on new style classes to work properly. Don't forget to inherit from object! class MyClass(object): # ! ... ...
php - setter of objects is not called
php,oop,object,setter,getter-setter
You know about the magic setter. Use a magic getter also. If it wants to get a var that does not exists: create one (in an array or something like that) that is an instance of that class....
Getter Setter Returns Nothing-Java
For anyone in this predicament my getter-setter: public class IcsList { static ArrayList<String> list1; public IcsList(){ list1 =new ArrayList<String>();} public static ArrayList<String> getList1(){ return list1; } } Where I add to the ArrayList in the IcsList class: IcsList icsList= new IcsList(); ArrayList<String> arrayList= icsList.getList1(); arrayList.add(event); arrayList.add(honey); arrayList.add(happy); Where I retrieve...
Private setter typescript?
typescript,setter,getter-setter,accessor
The TypeScript specification (8.4.3) says... Accessors for the same member name must specify the same accessibility So you have to choose a suitable alternative. Here are two options for you: You can just not have a setter, which means only the Test class is able to set the property. You...
Is it advisable to have a getter that return a different value than that set by the setter?
python,return-value,getter-setter
If your setters and getters are performing significant work, they really aren't setters or getters any more. Although the code is correct, I would recommand renaming (one or both of) the functions, so that it is clear when using them that they are not simple getters and setters. Something like:...
Why getter method doesn't return any object's attribute?
java,arrays,object,return-value,getter-setter
You need to iterate the authors array in order to print the Strings inside it. something like this: System.out.println("All info for the first book: \n"); System.out.println("Name: " + book1.getName()); System.out.println("ISBN: " + book1.getIsbn()); for (String author : book1.getAuthors()) { System.out.println("Author: " + author); } Also there's a problem in your...
Why does initWithCoder need self.property?
objective-c,getter-setter,initwithcoder
I do not think it is generally true that you must use properties in initWithCoder:. I have a lot of code (and have seen a lot) where ivar access is used in initWithCoder:, if that may help as a hint. If you were not using ARC, then your implementation setting...
Unable to have methods from one class use user input from another class in Java
java,class,methods,user-input,getter-setter
There is lot of work you need to do. Lets go one by one, 1)You have created an object of HeartRates, but you are not storing any values into to it. Just defining setters wont do your job. An example for initialization. System.out.print("Enter the year you were born in (full...
How to set text for JTextField from another class using DocumentFIlter?
java,swing,getter-setter,documentfilter
Your DocumentFilter needs a reference to the displayed NewDemo GUI object. Don't just create a new NewDemo instance as another has suggested, since that will create a non-displayed separate instance, but rather pass in the appropriate displayed reference. e.g., ((AbstractDocument) textField.getDocument()) .setDocumentFilter(new MyDocumentFilter(this)); //!! and class MyDocumentFilter extends DocumentFilter {...