getter - w3toppers.com

Best way of invoking getter by reflection

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

How to trace a NullPointerException in a chain of getters

NPE is the most useless Exception in Java, period. It seems to be always lazily implemented and never tells exactly what caused it, even as simple as “class x.y.Z is null” would help a lot in debugging such cases. Anyway, the only good way I’ve found to find the NPE thrower in these cases is … Read more

Java Interface Usage Guidelines — Are getters and setters in an interface bad?

I don’t see why an interface can’t define getters and setters. For instance, List.size() is effectively a getter. The interface must define the behaviour rather than the implementation though – it can’t say how you’ll handle the state, but it can insist that you can get it and set it. Collection interfaces are all about … Read more

Getter/setter on javascript array?

Using Proxies, you can get the desired behavior: var _arr = [‘one’, ‘two’, ‘three’]; var accessCount = 0; function doSomething() { accessCount++; } var arr = new Proxy(_arr, { get: function(target, name) { doSomething(); return target[name]; } }); function print(value) { document.querySelector(‘pre’).textContent += value + ‘\n’; } print(accessCount); // 0 print(arr[0]); // ‘one’ print(arr[1]); // … Read more

What should a C++ getter return

You can provide both const and non-const versions: MyType & MyClass::getMyType() { return mMyType; } MyType const & MyClass::getMyType() const { return mMyType; } I wouldn’t provide a pointer version, since that implies that the return value might be the null pointer, which it can never be in this instance. The real point, however, is … Read more

Conventions for accessor methods (getters and setters) in C++

From my perspective as sitting with 4 million lines of C++ code (and that’s just one project) from a maintenance perspective I would say: It’s ok to not use getters/setters if members are immutable (i.e. const) or simple with no dependencies (like a point class with members X and Y). If member is private only … Read more

What are getters and setters for in ECMAScript 6 classes?

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.

Magic __get getter for static properties in PHP

No, it is not possible. Quoting the manual page of __get : Member overloading only works in object context. These magic methods will not be triggered in static context. Therefore these methods can not be declared static. In PHP 5.3, __callStatic has been added ; but there is no __getStatic nor __setStatic yet ; even … Read more

What is the point of getters and setters? [duplicate]

Multiple reasons: If you allow field access like shape.x = 90 then you cannot add any logic in future to validate the data. say if x cannot be less than 100 you cannot do it, however if you had setters like public void setShapeValue(int shapeValue){ if(shapeValue < 100){ //do something here like throw exception. } … Read more

What are the advantages of using getters and setters instead of functions or simply public fields in PHP? [closed]

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; } } ?>