anonymous-class

问题 Closed. This question is off-topic. It is not currently accepting answers. Want to improve this question? Update the question so it's on-topic for Stack Overflow. Closed 5 years ago . The oops rule is "No class can exist without constructor".its ok.But in java Anonymous class can'never have its constructor.because it does not have any name. So it is contradict OOPS rule..I m really confused.Is it breaking OOPS rule?Please help 回答1: Actually, they have one implicit constructor. Suppose you

问题 Closed. This question is off-topic. It is not currently accepting answers. Want to improve this question? Update the question so it's on-topic for Stack Overflow. Closed 5 years ago . The oops rule is "No class can exist without constructor".its ok.But in java Anonymous class can'never have its constructor.because it does not have any name. So it is contradict OOPS rule..I m really confused.Is it breaking OOPS rule?Please help 回答1: Actually, they have one implicit constructor. Suppose you

问题 In Java, I can say Thread t = new Thread(){ public void run(){ // do stuff } } (or something much like that) to declare an anonymous class inline. This is most useful for making event handlers or other callback sorts of things, that in any sensible language wouldn't require an object to own them in the first place. I face the same problem in Jython -- I want to define an event handler, but I don't want to build a whole standalone class to do so. Ideally, I'd just be able to pass a lambda and

问题 Consider this piece of code: public class TopLevelClass { Cloneable c = new Cloneable() { private int privateField; private void privateMethod() {}; }; } There is an anonymous class that has a private member field and a private member method. It has been successfully compiled. Then consider this one: public class TopLevelClass { Cloneable c = new Cloneable() { private class PrivateInnerClass {} }; } There is an anonymous class that has a private member class. However... javac said: error:

问题 I asked this question before but I didn't get an appropriate answer. How can non-final fields be used in a anonymous class class if their value can change? class Foo{ private int i; void bar(){ i = 10 Runnable runnable = new Runnable (){ public void run (){ System.out.println(i); //works fine }//end method run }//end Runnable }//end method bar }//end class Foo If the local variables which are used inside an anonymous class must be final to enable the compiler inlining their values inside the

问题 In there an internal issue why java anonymous classes cannot implement and subclass at the same time? Or is it just because the syntax? 回答1: In there an internal issue why java anonymous classes cannot implement and subclass at the same time? I believe it is 99% due to syntactical reasons. Type parameters even support intersection types ( <T extends InterfaceX & InterfaceY> ) so I don't think such feature would introduce any contradictions or complications. An expression like new (InterfaceX

问题 While working with LinqPad I have a Select x, Extra=f(y) query where I'd like to return all the properties (and fields) of x at the same level as Extra , rather than as separate x and Extra properties (or fields). Can this be done? I.e. I want Select x.p1, x.p2, Extra=f(y) without having to type that much. Note the type of x may or may not actually be anonymous, just somewhat opaque or just too big to copy out manually. The type resulting from the VB.NET implicit typing and the C# explicit

问题 I have always had trouble with this example. It seems unnecessarily complex way to show the concepts it is trying to: http://docs.oracle.com/javase/tutorial/essential/concurrency/deadlock.html So my question has nothing to do with synchronization or locking; it is probably about anonymous classes: It is simply how does the code in bowBack which is called in the bow method get accessed? The anonymous class that implements runnable is passed the bow() method. Maybe this is a bad question. But

问题 I want to route certain chars to methods, so that when the char is typed in the command-line the method is then executed. Based on the answer How to call a method stored in a HashMap, I'm mapping these chars to methods by using the "Command" design-pattern. However I want to generically implement this, so it seems that I need to implement reflection in order to use the Method class as a parameter. My attempt is getting a NullPointerException on the field private Method method in my anonymous

问题 I have an anonymous type variable. This variable is get from another function, we couldn't change it. // var a {property1 = "abc"; property2 = "def"} I have a class: class Myclass{ string property1; string property2; } How to convert variable a to Myclass type. I tried Myclass b = (Myclass)a; but it doesn't work. If I initialize: Myclass b = new Myclass{ property1 = a.property1, property2 = a.property2, } it is working, but it take a lot of code because MyClass has many properties Can anyone