So, if I understand your question correctly, you are asking about how you can create an object when you just have the name of the type as string. So, for example, you might have a string “MyStruct” and you want to create an object of this type. Unfortunately, that’s not easily possible because Go is … Read more
Storing a list of object instances is very simple class MyClass(object): def __init__(self, number): self.number = number my_objects = [] for i in range(100): my_objects.append(MyClass(i)) # later for obj in my_objects: print obj.number
You call the constructor to create a new instance of your object. It has a reference to another instance, which you initialize with another new instance of ObjectType which, in turn, does the same thing. it’s an infinite number of calls until you get that error. This will work. public class ObjectTest { public ObjectTest() … Read more
In terms of the actual error here, if parseYouTubeAndYahoo class is a non-static inner class inside of your Activity, then you need an instance of the enclosing class in order to instantiate the inner class. So, you’ll need: MainActivity myActivity = new MainActivity(); MainActivity.parseYouTubeAndYahoo asyncTask = myActivity.new parseYouTubeAndYahoo(); However…. You really shouldn’t be instantiating non-static … Read more
Call Class.getConstructor() and then Constructor.newInstance() passing in the appropriate arguments. Sample code: import java.lang.reflect.*; public class Test { public Test(int x) { System.out.println(“Constuctor called! x = ” + x); } // Don’t just declare “throws Exception” in real code! public static void main(String[] args) throws Exception { Class<Test> clazz = Test.class; Constructor<Test> ctor = clazz.getConstructor(int.class); … Read more
Double-underscore methods are always looked up on the class, never the instance. See Special method lookup for new-style classes: For new-style classes, implicit invocations of special methods are only guaranteed to work correctly if defined on an object’s type, not in the object’s instance dictionary. That’s because the type might need to support the same … Read more
From http://api.jquery.com/jQuery.makeArray/: Many methods, both in jQuery and in JavaScript in general, return objects that are array-like. For example, the jQuery factory function $() returns a jQuery object that has many of the properties of an array (a length, the [] array access operator, etc.), but is not exactly the same as an array and … Read more
First of all, you cannot reassign a loop variable—well, you can, but that won’t change the list you are iterating over. So setting foo = 0 will not change the list, but only the local variable foo (which happens to contain the value for the iteration at the begin of each iteration). Next thing, small … Read more
‘self’ is only a reference to the object. ‘del self’ is deleting the ‘self’ reference from the local namespace of the kill function, instead of the actual object. To see this for yourself, look at what happens when these two functions are executed: >>> class A(): … def kill_a(self): … print self … del self … Read more
Every Activity you make is started through a sequence of method calls. onCreate() is the first of these calls. Each and every one of your Activities extends android.app.Activity either directly or by subclassing another subclass of Activity. In Java, when you inherit from a class, you can override its methods to run your own code … Read more