How do I call a method from another method?
You need to use self. to call another method of the same class: class Foo: def __init__(self): pass def method1(self): print(‘Method 1’) def method2(self): print(‘Method 2’) self.method1()
methods
Is it possible to find the source for a Java native method?
From jdk/src/share/native/java/lang/Object.c static JNINativeMethod methods[] = { {“hashCode”, “()I”, (void *)&JVM_IHashCode}, {“wait”, “(J)V”, (void *)&JVM_MonitorWait}, {“notify”, “()V”, (void *)&JVM_MonitorNotify}, {“notifyAll”, “()V”, (void *)&JVM_MonitorNotifyAll}, {“clone”, “()Ljava/lang/Object;”, (void *)&JVM_Clone}, }; Meaning its a function pointer(probably done so they could implement platform-specific native code) doing a grep for JVM_Clone produces, among other things: (from hotspot/src/share/vm/prims/jvm.cpp) JVM_ENTRY(jobject, JVM_Clone(JNIEnv* env, … Read more
Why does this generic java method accept two objects of different type?
T is inferred to be Object, and both arguments are getting implicitly upcast. Thus the code is equivalent to: Main.<Object>random((Object)”string1″, (Object)new Integer(10)); What may be even more surprising is that the following compiles: random(“string1”, 10); The second argument is getting auto-boxed into an Integer, and then both arguments are getting upcast to Object.
Method Chains PHP OOP
This is called Fluent Interface — there is an example in PHP on that page. The basic idea is that each method (that you want to be able to chain) of the class has to return $this — which makes possible to call other methods of that same class on the returned $this. And, of … Read more
Why is a method not identical to itself?
When you ask for an instance attribute which is a function, you get a bound method: a callable object which wraps the function defined in the class and passes the instance as the first argument. In Python 2.x, when you ask for a class attribute which is a function, you get a similar proxy object … Read more
Double vs double in java [duplicate]
Double parameter can be null when double can’t.
Why are python static/class method not callable?
Why are descriptors not callable? Basically because they don’t need to be. Not every descriptor represents a callable either. As you correctly note, the descriptor protocol consists of __get__, __set__ and __del__. Note no __call__, that’s the technical reason why it’s not callable. The actual callable is the return value of your static_method.__get__(…). As for … Read more
Python Unbound Method TypeError
You reported this error: TypeError: unbound method get_pos() must be called with app instance as first argument (got nothing instead) What this means in layman’s terms is you’re doing something like this: class app(object): def get_pos(self): … … app.get_pos() What you need to do instead is something like this: the_app = app() # create instance … Read more
Why does setattr fail on a bound method
The short answer: There is no way of adding custom attributes to bound methods. The long answer follows. In Python, there are function objects and method objects. When you define a class, the def statement creates a function object that lives within the class’ namespace: >>> class c: … def m(self): … pass … >>> … Read more
Java: How to find if a method is overridden from base class? [duplicate]
This question helps demonstrate how to get the information of which class that method belongs to: How to quickly determine if a method is overridden in Java class.getMethod(“myMethod”).getDeclaringClass();