Like most of the other answers have said, instance methods use an instance of a class, whereas a class method can be used with just the class name. In Objective-C they are defined thusly: @interface MyClass : NSObject + (void)aClassMethod; – (void)anInstanceMethod; @end They could then be used like so: [MyClass aClassMethod]; MyClass *object = … Read more
In Python, this: my_object.method(“foo”) …is syntactic sugar, which the interpreter translates behind the scenes into: MyClass.method(my_object, “foo”) …which, as you can see, does indeed have two arguments – it’s just that the first one is implicit, from the point of view of the caller. This is because most methods do some work with the object … Read more
Technically this will work… String name = new Object(){}.getClass().getEnclosingMethod().getName(); However, a new anonymous inner class will be created during compile time (e.g. YourClass$1.class). So this will create a .class file for each method that deploys this trick. Additionally, an otherwise unused object instance is created on each invocation during runtime. So this may be an … Read more
From the Python PEP 8 — Style Guide for Python Code: Descriptive: Naming Styles The following special forms using leading or trailing underscores are recognized (these can generally be combined with any case convention): _single_leading_underscore: weak “internal use” indicator. E.g. from M import * does not import objects whose name starts with an underscore. single_trailing_underscore_: … Read more
In general, methods that end in ! indicate that the method will modify the object it’s called on. Ruby calls these as “dangerous methods” because they change state that someone else might have a reference to. Here’s a simple example for strings: foo = “A STRING” # a string called foo foo.downcase! # modifies foo … Read more
my_list = [1,2,3,4,5] len(my_list) # 5 The same works for tuples: my_tuple = (1,2,3,4,5) len(my_tuple) # 5 And strings, which are really just arrays of characters: my_string = ‘hello world’ len(my_string) # 11 It was intentionally done this way so that lists, tuples and other container types or iterables didn’t all need to explicitly implement … Read more
In Python, there is a difference between functions and bound methods. >>> def foo(): … print “foo” … >>> class A: … def bar( self ): … print “bar” … >>> a = A() >>> foo <function foo at 0x00A98D70> >>> a.bar <bound method A.bar of <__main__.A instance at 0x00A9BC88>> >>> Bound methods have been … Read more
You can use the Func delegate in .net 3.5 as the parameter in your RunTheMethod method. The Func delegate allows you to specify a method that takes a number of parameters of a specific type and returns a single argument of a specific type. Here is an example that should work: public class Class1 { … Read more
No, the structure you found is how Java handles it (that is, with overloading instead of default parameters). For constructors, See Effective Java: Programming Language Guide’s Item 1 tip (Consider static factory methods instead of constructors) if the overloading is getting complicated. For other methods, renaming some cases or using a parameter object can help. … Read more