inner-classes

问题 Suppose i have class like below with multiple inner classes : public class Constants { public class Class1 { public static final String IODATA = "IOData"; public static final String HUB_INPUTS = "HubInputs"; } public class Class2 { public static final String CLASS_INPUTS = "Class Inputs"; public static final String AUXILIARIES_ON_BUTTON = "Auxiliaries On Button"; } public class Class3 { public static final String CLASS_INPUTS = "Class Inputs"; public static final String AUXILIARIES_ON_BUTTON

问题 Given: static class Question { // stuff List<Value> values static class Value { // stuff } When I run: Question question = new Question() question.id = "whatever" if (it == QuestionType.SELECT || it == QuestionType.MULTICHOICE) { question.values = [new Question.Value(), new Question.Value()] for (Question.Value v : question.values) { // stuff } question.values contains an array of Question objects and NOT Value. Intellij doesn't give me any error nor warnings. I tried evaluating "new Question

问题 I have two traits, one extending the other, each with an inner class, one extending the other, with the same names: trait A { class X { def x() = doSomething() } } trait B extends A { class X extends super.X { override def x() = doSomethingElse() } } class C extends B { val x = new X() // here B.X is instantiated val y = new A.X() // does not compile val z = new A.this.X() // does not compile } How do I access A.X class in the C class's body? Renaming B.X not to hide A.X is not a preferred

问题 I'm writing a small Python application that contains a few nested classes, like the example below: class SuperBar(object): pass class Foo(object): NAME = 'this is foo' class Bar(SuperBar): MSG = 'this is how Bar handle stuff' class AnotherBar(SuperBar): MSG = 'this is how Another Bar handle stuff' I'm using nested classes to create some sort of hierarchy and to provide a clean way to implement features for a parser. At some point, I want to create a list of the inner classes. I'd like to have

问题 So I'm getting the error: "CANNOT REFER TO A NON-FINAL VARIABLE ROLE INSIDE AN INNERCLASS DEFINED IN A DIFFERENT METHOD". I want to be able to set the string roletype to whatever get's selected in that Dropdown. How can I do this if not in the way I'm trying below, or am I simply making some stupid error in the code I'm trying? Thanks, Ravin import java.awt.*; import java.awt.event.*; import java.util.*; import javax.swing.*; import javax.swing.*; import javax.swing.event.*; public class

问题 This question already has answers here : Java inner class and static nested class (26 answers) Closed 5 years ago . class Outer { class Inner { } } public class Demo { public static void main(String args[]) { Outer o = new Outer(); Outer.Inner inner = o.new Inner(); } } the way I create a reference for Inner class object is something like accessing static member in Outer class ? could you please explain the mechanism behind this ? 回答1: the way I create a reference for Inner class object is

问题 I have a nested class like so: class Mammal H = "Mammal" class Human H = "Human" end end And I want to make an Human object and after access the Human's constant, like so: human = Mammal::Human.new # makes an object successfully puts human::H # does not work ** puts Mammal::Human::H # works ["Human"] puts Mammal::H # works ["Mammal"] **.. but it won't work ("..is not a class/module [TypeError]"). What am i doing wrong? 回答1: What am I doing wrong? You're trying to refer a constant from a wrong

问题 I have a query regarding accessibility of top level class from member inner class. I have just read the reason why local or anonymous inner classes can access only final variables.The reason being JVM handles these two classes as entirely different classes and so, if value of variable in one class changes, it can't be reflected at run time in another class file. Then, my question is that how an inner member class (non-static) can have access to members to members of top level class, as JVM is

问题 public class ABC extends XYZ { public static class InnerClass1 { ... } public static class InnerClass2 { ... } public static class InnerClass3 { ... } public static class InnerClass4 { ... } } In the above code, I cannot access the methods of the class XYZ inside the inner classes1,2,3 and 4. How can i modify the above structure so that the inner classes can access the methods within the class XYZ ? Thanks in advance ! 回答1: public class ABC extends XYZ { public static class InnerClass1 { ...

问题 When i am calling the inner class JFrame , it is called and it is displaying, but the outer class JFrame is not hiding. here i am providing my code. To be very specific, I am trying to fill a form and then i want to preview the form what i have written. package com.vote.rmc; public class LRegister extends JFrame implements ActionListener { final public JFrame rframe = new JFrame(); JLabel public LRegister() { rframe.setSize(800, 600); rframe.setLocationRelativeTo(null); cp = getContentPane();