inner-classes

问题 i am trying to (1) log all properties of an object, and (2) all properties of a specific object type within. i can do the (1) but not (2). this is the case now. foreach (PropertyDescriptor descriptor in TypeDescriptor.GetProperties(object1)) { string name = descriptor.Name; object value = descriptor.GetValue(object1); logger.Debug(String.Format("{0} = {1}", name, value)); } what i need is something like: foreach (PropertyDescriptor descriptor in TypeDescriptor.GetProperties(object1)) { string

问题 I want to create a class B that inherits from template class A. And I want the B's nested class E to be the template parameter in this inheritance. More visually: template <class T> class A { } class B : public A<B::E> { class E { int x; } } class C : public A<C::E> { class E { int x; int y; } } I think the problem is that the compiler doesn't know that the class B will have a nested class E by the time it's processing the declaration of B, since I'm getting the error: no member named 'E' in

问题 I have this method (in my own classloader) that loads classes from zip: ZipInputStream in = new ZipInputStream(new FileInputStream(zip)); ZipEntry entry; while ((entry = in.getNextEntry()) != null) { if (!entry.isDirectory()) { byte[] buffer = new byte[(int) entry.getSize()]; in.read(buffer); if (!entry.getName().endsWith(".class")) continue; String name = entry.getName().replace(".class", "").replace("/", "."); Class<?> cls = this.defineClass(name, buffer, 0, buffer.length); this

问题 Does Java shadow type parameters? I am finding it hard to test for myself because Java generics do not get reified at run time. For example, given this code: public class NestedGeneric<T> { private InnerGeneric<T> innerGenericInstance; private static class InnerGeneric<T> { public T innerGenericField; } NestedGeneric() { innerGenericInstance = new InnerGeneric<T>(); } } Both the below statements compile fine: NestedGeneric<Integer> test1 = new NestedGeneric<Integer>(); NestedGeneric

问题 I have a class being @Autowired in inner class. But while executing it throws a Null Pointer Exception, whereas it works fine when Autowired in outer class class outer { ... class inner { @Autowired private var somevar; private process () { somevar.someMethod(); } } Any idea why this is not working? somevar.someMethod(); line is generating NPE. 回答1: Is there any reason why the outer class manages the inner instance creation? For example does the inner object need a reference to the outer one?

问题 I have a class being @Autowired in inner class. But while executing it throws a Null Pointer Exception, whereas it works fine when Autowired in outer class class outer { ... class inner { @Autowired private var somevar; private process () { somevar.someMethod(); } } Any idea why this is not working? somevar.someMethod(); line is generating NPE. 回答1: Is there any reason why the outer class manages the inner instance creation? For example does the inner object need a reference to the outer one?

问题 I have recently learned Joshua Bloch's builder pattern for creating objects with many optional fields. I've been using something like it for years, but never used an inner-class until Bloch's book suggested it to me. I love it. I understand that another thread may alter the bulider's configuration, before it's actually built (with build() ), such that it may be necessary to re-validate all values in the constructor of the enclosing class. Below is an example of a builder class that optionally

问题 I have recently learned Joshua Bloch's builder pattern for creating objects with many optional fields. I've been using something like it for years, but never used an inner-class until Bloch's book suggested it to me. I love it. I understand that another thread may alter the bulider's configuration, before it's actually built (with build() ), such that it may be necessary to re-validate all values in the constructor of the enclosing class. Below is an example of a builder class that optionally

问题 I'm trying to build a script for import in my future projects. That Script should create some tk.Frames in a tk.Frame and let me edit the created ones in a main . I think, the best way to get there is to create a Holder_frame class and put some nested classes in. so I could call them in my main with Holder_frame.F1. I tried a lot of code and I ended up here making me an account. Anyway here is where Im at: import tkinter as tk from tkinter import Frame,Button class BaseClass(tk.Frame): def _

问题 I have a requirement in which 28 threads have to complete some functionality. I have created these threads as in anonymous inner classes like : Thread t=new Thread(new Runnable(){public void run() {//code }} ); t.start(); Now I want that the further execution should start after all these threads have finished there work. Note : I am confused about join() method as it makes my threads run sequentially. So can anyone suggest me how can I make main thread run once these threads are done with