Your problem is twofold: You don’t have a class defined at the root level. The class structure needs to match the entire JSON, you can’t just deserialize from the middle. Whenever you have an object whose keys can change, you need to use a Dictionary<string, T>. A regular class won’t work for that; neither will … Read more
Basically just an arbitrary decision. there’s no reason it couldn’t be supported, but there is also not really any good reason to support it. just declare the static field in the outer class. also, that quote may not be entirely correct: i believe you can declare a static serialVersionUID in an inner class. Update, sounds … Read more
This information is a around a decade out of date. The widespread use of anonymous inner classes with AccessController.doPrivileged should be a clue. (If you don’t like the API, consider the proportion of try–finally blocks that are incorrectly missing in the JDK.) The policy is that no two class can share the same package if … Read more
Like this: class Outer { class Inner { void myMethod() { // This will print “Blah”, from the Outer class’ toString() method System.out.println(Outer.this.toString()); // This will call Object.toString() on the Outer class’ instance // That’s probably what you need System.out.println(Outer.super.toString()); } } @Override public String toString() { return “Blah”; } public static void main(String[] args) … Read more
I’m using polygenelubricants’s smaller snippet. Remember there’s no concept of nested classes in the bytecode; the bytecode is, however, aware of access modifiers. The problem the compiler is trying to circumvent here is that the method instantiate() needs to create a new instance of PrivateInnerClass. However, OuterClass does not have access to PrivateInnerClass‘s constructor (OuterClass$PrivateInnerClass … Read more
(Edit: expanded on the answer to answer some of the comments) The compiler takes the inner classes and turns them into top-level classes. Since private methods are only available to the inner class the compiler has to add new “synthetic” methods that have package level access so that the top-level classes have access to it. … Read more
Make ShowBike.Bicycle static. public class ShowBike { private static class Bicycle { public int gear = 0; public Bicycle(int v) { gear = v; } } public static void main() { Bicycle bike = new Bicycle(5); System.out.println(bike.gear); } } In Java there are two types of nested classes: “Static nested class” and “Inner class”. Without … Read more
You’re asking for reasoning of a change in Java 16, so you should start by checking the Release Notes to see if it has anything to say. It does: JEP 395: Records (JDK-8246771) tools/javac Records have been added to the Java language. Records are a new kind of class in the Java language. They act … Read more
You need to jump through a few hoops to do this. First, you need to use Class.getConstructor() to find the Constructor object you want to invoke: Returns a Constructor object that reflects the specified public constructor of the class represented by this Class object. The parameterTypes parameter is an array of Class objects that identify … Read more