Use Object.defineProperty() on Subclass.prototype. There are also __defineGetter__ and __defineSetter__ available on some browsers, but they are deprecated. For your example, it would be: Object.defineProperty(Subclass.prototype, “myProperty”, { get: function myProperty() { // code } });
These setter and getter allow you to use the properties directly (without using the parenthesis) var emp = new Employee(“TruMan1”); if (emp.name) { // uses the get method in the background } emp.name = “New name”; // uses the setter in the background This is only to set and get the value of the property.
Tutorial is not really required for this. Read up on encapsulation private String myField; //”private” means access to this is restricted to the class. public String getMyField() { //include validation, logic, logging or whatever you like here return this.myField; } public void setMyField(String value) { //include more logic this.myField = value; }
Absolutely pointless – you’re better off without this kind of crap cluttering your code: /** * Sets the foo. * * @param foo the foo to set */ public void setFoo(float foo); Very useful, if warranted: /** * Foo is the adjustment factor used in the Bar-calculation. It has a default * value depending on … Read more
In addition to @millimoose’s answer, setters can also be used to update other values. function Name(first, last) { this.first = first; this.last = last; } Name.prototype = { get fullName() { return this.first + ” ” + this.last; }, set fullName(name) { var names = name.split(” “); this.first = names[0]; this.last = names[1]; } }; … Read more
I think this should point you towards the right direction: import java.beans.* for (PropertyDescriptor pd : Introspector.getBeanInfo(Foo.class).getPropertyDescriptors()) { if (pd.getReadMethod() != null && !”class”.equals(pd.getName())) System.out.println(pd.getReadMethod().invoke(foo)); } Note that you could create BeanInfo or PropertyDescriptor instances yourself, i.e. without using Introspector. However, Introspector does some caching internally which is normally a Good Thing ™. If you’re … Read more
Yes, both of them are read-only, but there is a difference. In the first one, there’s a backing field which is initialized to 0 before the constructor is executed. You can change the value only in the constructor, just like a regular read-only field. The getter itself just returns the value of the field. In … Read more
What you have here is a – naive – implementation of “lazy initialization”. Short answer: Using lazy initialization unconditionally is not a good idea. It has its places but one has to take into consideration the impacts this solution has. Background and explanation: Concrete implementation: Let’s first look at your concrete sample and why I … Read more
You can use php magic methods __get and __set. <?php class MyClass { private $firstField; private $secondField; public function __get($property) { if (property_exists($this, $property)) { return $this->$property; } } public function __set($property, $value) { if (property_exists($this, $property)) { $this->$property = $value; } return $this; } } ?>
There is also the point of view that most of the time, using setters still breaks encapsulation by allowing you to set values that are meaningless. As a very obvious example, if you have a score counter on the game that only ever goes up, instead of // Game private int score; public void setScore(int … Read more